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1.
The Cerro El Potro and nearby mountain chains belong to the Andean Frontal Cordillera (28°S). Cerro El Potro is a glaciated mountain that is surrounded by huge valleys both on its Chilean and Argentinean flanks. Its southern limit is a steep rock wall towards the trough-shaped Río Blanco valley in Argentina, with a wide valley floor. The other sides of the mountain are characterized by well-developed Pleistocene cirques. The predominant landforms in this area have been shaped in a periglacial environment superimposed on an earlier glacial landscape. It is a region with abundant rock glaciers, a noteworthy rock glacier zone, but nevertheless, it is a relatively little known area in South America. In this preliminary inventory, the landforms surveyed were mainly gravitational in origin, including valley rock glaciers, talus rock glaciers, debris cones, landforms originated by solifluction processes and talus detrital sheets on mountain sides. Ancient moraine deposits have been found on the sides of the main rivers that cross the area form west to east, including the Blanco and Bermejo rivers. Present day fluvial activity is limited, and restricted to these main rivers. In this area of glacial valleys and small cirques, there are small lakes and other water bodies, grass covered patches and zones with high mountain vegetation. Present day glacial activity is restricted to the highest part of the area, above 5500 m a.s.l., mainly in the Cerro El Potro (5879 m) where a permanent ice field exists, as well as small mountain glaciers. 相似文献
2.
Li Yanyan Feng Xuyang Yao Aijun Zhang Zhihong Li Kun Wang Qiusheng Song Shengyuan 《Landslides》2022,19(5):1069-1086
This paper presents a study on an ancient river-damming landslide in the SE Tibet Plateau, China, with a focus on time-dependent gravitational creep leading to slope failure associated with progressive fragmentation during motion. Field investigation shows that the landslide, with an estimated volume of 4.9?×?107 m3, is a translational toe buckling slide. Outcrops of landslide deposits, buckling, toe shear, residual landslide dam, and lacustrine sediments are distributed at the slope base. The landslide deposits formed a landslide dam over 60 m high and at one time blocked the Jinsha River. Optically stimulated luminescence dating for the lacustrine sediments indicates that the landslide occurred at least 2,600 years ago. To investigate the progressive evolution and failure behavior of the landslide, numerical simulations using the distinct element method are conducted. The results show that the evolution of the landslide could be divided into three stages: a time-dependent gravitational creep process, rapid failure, and granular flow deposition. It probably began as a long-term gravitationally induced buckling of amphibolite rock slabs along a weak interlayer composed of mica schist which was followed by progressive fragmentation during flow-like motion, evolving into a flow-like movement, which deposited sediments in the river valley. According to numerical modeling results, the rapid failure stage lasted 35 s from the onset of sudden failure to final deposition, with an estimated maximum movement rate of 26.8 m/s. The simulated topography is close to the post-landslide topography. Based on field investigation and numerical simulation, it can be found that the mica schist interlayer and bedding planes are responsible for the slope instability, while strong toe erosion caused by the Jinsha River caused the layered rock mass to buckle intensively. Rainfall or an earthquake cannot be ruled out as a potential trigger of the landslide, considering the climate condition and the seismic activity on centennial to millennial timescales in the study area.
相似文献3.
The Todagin Creek landslide is located at 57.61° N 129.98° W in Northwest British Columbia. A seismic station 90 km north
of the landslide recorded the event at 1643 hours coordinated universal time (UTC; 0943 hours Pacific daylight time (PDT))
on October 3, 2006. The signal verifies the discovery and relative time bounds provided by a hunting party in the valley.
The landslide initiated as a translational rock slide on sedimentary rock dipping down slope at 34° and striking parallel
to the valley. The landslide transformed into a debris avalanche and had a total volume estimated at 4 Mm3. An elevation drop of 771 m along a planar length of 1,885 m resulted in a travel angle (fahrb?schung) of 21.3°. The narrowest
part of the landslide through the transport zone is 345 m. The widest part of the divergent toe of the landslide reaches a
width of 1,010 m. Landslide debris impounded a lake of approximately 32 ha and destroyed an additional 67 ha of forest. The
impoundment took 7 to 10 days to fill, with muddied waters observed downstream on October 13. No clear linkage exists with
precipitation and temperature records preceding the landslide, but strong diurnal temperature cycles occurred in the days
prior to the event. The Todagin Creek area appears to have an affinity for large landslides with the deposits of three other
landslides >5 Mm3 observed in the valley. 相似文献
4.
A catastrophic rock avalanche–mud flow was triggered by the heavy rainfall in Sichuan, China, on July 27, 2010. A mass of
strongly weathered basalts with a volume of ∼480,000 m3 was initiated from a valley side slope and then moved downstream along the valley, entraining a large amount of unconsolidated
substrate and bilateral materials and colluviums. The entrainment increased the volume of slide to ∼1.0 million m3 and may also enhance the mobility of the landslide. Approximately 30 min after the first failure, the deposits of the rock
avalanche in the steepest part of the valley started to creep slowly down as a mud flow. It reached a small town at the foot
of the slope after several hours, causing the damage of 92 houses and the urgent evacuation of 1,500 people. The field investigation,
mapping, grain size test, and aerial photo interpretation were applied to analyze the dynamic process and the formation mechanism
of the landslide. The strongly weathered and fragmented basalts as well as the most vulnerable combination of joint sets were
revealed to be the most contributive factors. The antecedent torrential rainfall is the direct trigger, which affected the
slope stability in three aspects: induced debris flow that scoured the toe of the sliding surface of rock avalanche; caused
the increase of the slope unit weight, and penetrated into the steep joints reducing the strength of the materials. 相似文献
5.
Many relict rock glaciers and protalus lobes have been described in mountainous areas of the British Isles. This paper reviews their distribution, chronology, supposed origin and development, and places the research within current investigations and knowledge. Rock glaciers and protalus lobes are located in a number of different topographic locations and settings. They developed at the base of steep cliffs following the catastrophic failure of rock faces, at the base of scree slopes following the gradual accumulation of rock debris and in association with glaciers. Protalus lobes probably developed in response to the permafrost creep of talus material while rock glaciers formed through the deformation and sliding of large bodies of buried ice. Rock glaciers probably developed, or were last active, during the Younger Dryas, although the possibility exists that some of these landforms are Dimlington Stadial in age. The development of protalus lobes during the Younger Dryas suggests that precipitation levels were low and permafrost was widespread during this time. The lack of rock glaciers (sensu stricto) in the British Isles compared with other mountain areas is believed to be a consequence of the rock type and relative scarcity of weathered debris for their formation rather than a lack of suitable sites or appropriate environmental conditions. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
6.
福建省高速公路边坡病害类型分析 总被引：1，自引：0，他引：1
为解决边坡防护加固设计依据不足的问题,本文结合福建省高速公路路堑边坡工程实践,归纳了风化剥落、流石流泥、掉块落石、溜坍、坍塌、崩塌、倾倒、错落和滑坡等9大类路堑边坡常见病害类型,并对各病害类型的变形破坏特点进行分析：路堑边坡小规模变形破坏在富水土体中以流、溜、坍运动模式为主,在风化岩石中以剥、落运动模式为主;大规模变形破坏则受控于岩土体中结构面的空间位置及其组合形式,反倾岩层易产生＂倒＂,节理岩体易产生＂崩＂,残存结构面的软弱岩土体易形成＂塌＂,存在陡倾结构面和软弱坡脚的岩土体易形成＂错＂,以及沿特定软弱面做整体水平运动的＂滑＂等多种运动模式。 相似文献
7.
Evaluation of potential landslide damming: Case study of Urni landslide,Kinnaur, Satluj valley,India
This work aims to understand the process of potential landslide damming using slope failure mechanism,dam dimension and dam stability evaluation. The Urni landslide, situated on the right bank of the Satluj River, Himachal Pradesh(India) is taken as the case study. The Urni landslide has evolved into a complex landslide in the last two decade(2000-2016) and has dammed the Satluj River partially since year 2013,damaging ～200 m stretch of the National Highway(NH-05). The crown of the landslide exists at an altitude of ～2180-2190 m above msl, close to the Urni village that has a human population of about 500.The high resolution imagery shows ～50 m long landslide scarp and ～100 m long transverse cracks in the detached mass that implies potential for further slope failure movement. Further analysis shows that the landslide has attained an areal increase of 103,900 ± 1142 m^2 during year 2004-2016. About 86% of this areal increase occurred since year 2013. Abrupt increase in the annual mean rainfall is also observed since the year 2013. The extreme rainfall in the June, 2013; 11 June(～100 mm) and 16 June(～115 mm),are considered to be responsible for the slope failure in the Urni landslide that has partially dammed the river. The finite element modelling(FEM) based slope stability analysis revealed the shear strain in the order of 0.0-0.16 with 0.0-0.6 m total displacement in the detachment zone. Further, kinematic analysis indicated planar and wedge failure condition in the jointed rockmass. The debris flow runout simulation of the detached mass in the landslide showed a velocity of ～25 m/s with a flow height of ～15 m while it(debris flow) reaches the valley floor. Finally, it is also estimated that further slope failure may detach as much as 0.80 ±0.32 million m^3 mass that will completely dam the river to a height of 76±30 m above the river bed. 相似文献
8.
Between 2001 and 2005, a large debris rock slide occurred on the western slope of the Cordillera de Santa Cruz in the southeast
Andean corner of the Province of San Juan (31°40′ S–70°16′ W). The landslide material accumulated in a downstream gorge as
a natural dam of the Santa Cruz river, forming a large-volume lake. In November 2005, probably as a result of the increasing
pressure of the water volume, this natural dam breached off with a violent and unexpected flash flood. In addition to life-threatening
instances lived by some people downstream, this flood caused great economic loss to main localities of the Department of Calingasta,
as well as considerable damage to one of the most relevant projects of the Province, the Caracoles Hydropower Project dam
on the San Juan river. Considering the high costs of any physical remediation for a natural dam located in this high, remote,
and inaccessible mountain area with no reliable road access, the main protective measures left to be pondered are the installation
of a flash-flood early-warning system connected to downstream localities, along with a program of hydrological monitoring
at the dam-forming area and annual satellital monitoring to verify the evolution of accumulated mass movements. 相似文献
9.
A failure occurred between December 14 and 17, 2008 in the upper part of a 45-m high, northwest facing bank of the Nelson River in northern Manitoba (56.687°N, 93.777°W). The slope failure occurred at a spring site in a bay associated with a buried valley. The sediment input to the river from this event is roughly 20,000 to 25,000 m3. The source zone is made up of 25 m of water-bearing sand and gravel confined between ice-rich silty clay at the top of the bank and laminated to rhythmically bedded silt and clay at the base of the section. The collapse was confined to the material above the basal silts and clays and was associated with a perched groundwater flow system. A strong argument for drainage cutoff by the advancement of seasonal frost has been demonstrated through the correlation of the bank collapse with the timing of a significant cold snap recorded at two nearby weather stations. The failure illustrates the importance of stratigraphy in controlling bank erosion in this area. Previously, fluvial erosion was seen as an important control on mass wasting in Horseshoe Bay. However, surface information suggests that no toe erosion except to remove the slide deposit has occurred at this site since 2004. 相似文献
10.
The Sea to Sky Corridor has experienced hundreds of historic and prehistoric landslides. The most common types of historical
landslides are rock falls and debris flows, which are relatively small in volume but can be damaging. These types of failures
are more common in the southern part of the corridor, between Horseshoe Bay and Porteau, where infrastructure has been built
in close proximity to steep slopes. Farther north, fewer landslides have been reported historically, but those that have been
recorded are usually large and date to prehistoric time (e.g., Cheekye fan and Mystery Creek rock avalanche). As part of a
Geological Survey of Canada surficial geology and landslide inventory mapping study, Mystery Creek rock avalanche, near Whistler,
British Columbia, was sampled for 36Cl dating. Samples were collected from three large flat boulders of quartz diorite in the rock avalanche deposit to test a
correlation with the previously reported radiocarbon age of 800 ± 100 years BP on charcoal. One sample revealed a mean age
of 2,400 years and the other two, 4,300 and 4,800 years, respectively. These new results point to four possible interpretations:
(1) Mystery Creek landslide is about 800 years old; (2) Based on the overlapping 2σ uncertainties, the rock avalanche took
place between 2,200 and 3,600 years ago; (3) The rock avalanche deposit is 2,400 years old and the other two blocks are too
old; and (4) The rock avalanche is between 4,300 and 4,800 years old. Although there is strength in numbers and it is likely
that the age varies between 4,300 and 4,800 years, we favor the second interpretation where the age range is broader and statistically
significant for all three samples. Moreover, at this time, we favor discounting the radiocarbon age based on a greater number
of samples analyzed for 36Cl analysis and lack of detailed information on the charcoal sampling. The causes and triggers of the Mystery Creek rock avalanche
remain unknown, but direct glacial debuttressing can be ruled out. Some of the causes are likely a combination of the regional
tectonic setting which produced preferential planes of weakness reflected in the trend of major faults, headscarp, and reverse
scarps. Yearly cycles of freezing and thawing are considered a plausible cause based on present-day climate records. Finally,
a large earthquake still remains a possible trigger because of the active tectonic setting and the presence of potentially
contemporaneous landslides in the same area. Mystery Creek rock avalanche and other historic and pre-historic landslides contributed
to validation of a heuristic rock fall/rock slide/rock avalanche susceptibility mapping study, in which their headscarps correlated
well with medium-high to high susceptibility zones. In terms of hazard assessment, Mystery Creek rock avalanche, although
pre-historic in age, occurred in present-day climatic and geological conditions. This poses a threat to infrastructure such
as the Sea to Sky Highway, railway, and power line. 相似文献
11.
Saverio Romeo Lucio Di Matteo Laura Melelli Corrado Cencetti Walter Dragoni Andrea Fredduzzi 《Landslides》2017,14(4):1457-1465
On October 30, 2016, a seismic event and its aftershocks produced diffuse landslides along the SP 209 road in the Nera River Gorge (Central Italy). Due to the steep slopes and the outcropping of highly fractured and bedded limestone, several rockfalls were triggered, of which the main event occurred on the slope of Mount Sasso Pizzuto. The seismic shock acted on a rock wedge that, after an initial slide, developed into a rockfall. The debris accumulation blocked the SP 209 road and dammed the Nera River, forming a small lake. The river discharge was around 3.6 m3/s; the water overtopped the dam and flooded the road. By a preliminary topographic survey, we estimated that the debris accumulation covers an area of about 16,500 m2, while the volume is around 70,000 m3. The maximum volume occupied by the pre-existing talus mobilized by the rockfall is about 20% of the total volume. Besides blocking the road, the rockfall damaged a bridge severely, while, downstream of the dam, the water flow caused erosion of a road embankment. A rockfall protection gallery, a few hundred meters downstream of the dam, was damaged during the event. Other elastic nets and rigid barriers were not sufficient to protect the road from single-block rockfalls, with volumes around 1–2 m3. Considering the geological and geomorphological conditions, as well as the high seismicity and the socioeconomic importance of the area, a review of the entire rockfall protection systems is required to ensure protection of critical infrastructure and local communities. 相似文献
12.
A channelised long run-out debris slide triggered by the Noto Hanto Earthquake in 2007, Japan 总被引：2，自引：1，他引：1
Yasuhiko Okada Hirotaka Ochiai Ushio Kurokawa Yasuhiro Ogawa Shiho Asano 《Landslides》2008,5(2):235-239
A strong earthquake (M
J 6.9, M
W 6.6–6.7) at about 11 km depth hit the western shore of the Noto Peninsula on Honshu, Japan, at about 00:42 coordinated universal
time (9:42 a.m. local time) on 25 March 2007 (the Noto Hanto Earthquake in 2007). The earthquake triggered only 61 landslides, with most
traveling short distances. It caused one long run-out landslide in the Nakanoya district of Monzen town, Wajima city, Ishikawa
Prefecture, when a portion of a deep-seated landslide transformed into a moderate debris slide down a channel. The rock slide
occurred on a south-facing convex-shaped slope on a small spur where earthquake ground shaking likely was strongly amplified
by topography. A portion of the rock slide reached a small channel floored by materials containing abundant groundwater. Constant-volume
box-shear tests on normally consolidated saturated specimens revealed that the apparent angle of internal friction of the
channel-floor material was 33–36° at 10-mm shear displacement and did not show much decrease in effective normal stress during
shearing. In situ rock-sliding testing on the exposed channel materials showed a low kinetic-friction angle of about 21°.
We suggest that an unsaturated portion of the rock slide slid down the channel, with sliding between the rock-slide mass and
the channel floor. Because the slope angle of the travel path nearly equaled the kinetic-friction angle, the unsaturated rock
slide mass may have traveled at a moderately slow speed, or it might have decelerated and accelerated. Slow speed is supported
by accounts from local residents that suggest movement of debris continued for 3 days after the main shock. 相似文献
13.
Shengwen Qi Qiang Xu Bing Zhang Yuande Zhou Hengxing Lan Lihui Li 《Journal of Asian Earth Sciences》2011,40(4):896-906
The May 12, 2008 Wenchuan, China Earthquake which measured Mw = 8.3 according to Chinese Earthquake Administration – CEA (Mw = 7.9 according to the USGS) directly triggered many landslides, which caused about 20,000 deaths, a quarter of the total. Rock avalanches were among the most destructive landslides triggered by this seismic event, and have killed more people than any other type of landslide in this earthquake. The Donghekou rock avalanche, one example of a catastrophic avalanche triggered by the Wenchuan earthquake, occurred in Qingchuan and buried one primary school and 184 houses, resulting in more than 780 deaths, and in addition, caused the formation of two landslide dams, which formed barrier lakes.Combining aerial images (resolution of 0.5 m) with field investigations, this paper lists some parameters of 66 cases in one table, and details source characteristics of six typical cases. It has been found that most of the long runout rock avalanches have source areas with high relief and steep inclination, causing the debris in the travel courses to accelerate. There was also a large amount of saturated Holocene-age loose deposits formed by a river or gully that existed in the travel courses. Comparison studies indicate that saturated Holocene loose deposits in the travel courses could be the most important factor for the causes of the long runout characteristic of the rock avalanches especially when they traveled over gentle or even flat ground surfaces.Furthermore, the relationships among the relief slope gradient, runout and covered area are investigated, and a threshold line for predicting the maximum horizontal runout distance under certain change in elevation is presented. 相似文献
14.
通过地质调绘、钻探等地质勘查手段,查明了织纳高速公路龙井河特大桥桥位区堆积体滑坡的工程地质、水文地质条件,对滑坡进行了稳定性计算分析。通过静力平衡原理对埋置式抗滑桩进行了受力分析简化计算,确定了埋置式抗滑桩的埋置深度和悬臂段长度,为埋置式抗滑桩在实际工程中的运用提供了实用的设计方法,滑坡治理达到预期效果。 相似文献
15.
《Quaternary Science Reviews》2007,26(22-24):2864-2882
In this paper, we report our latest observations concerning a Pliocene and Early Pleistocene record from Western Turkey. The sedimentary sequence described comprises the fluvial deposits of an Early Pleistocene palaeo-Gediz river system and its tributaries prior to the onset of volcanism around Kula and the subsequent lacustrine, volcaniclastic and fluvial deposits associated with the first phase of volcanism (∼1.2 Ma) in this area.Early development of an east–west drainage system in this area resulted from tectonic adjustments to north–south extension and the formation of east–west-oriented grabens. Headward erosion of drainage entering the main Alaşehir graben led to the progressive capture of pre-existing drainage systems as eastward (headward) erosion upstream tapped drainage networks previously formed in internally draining NNE–SSW-oriented basins. Within one of these, the Selendi Basin, part of this evolutionary sequence is preserved as a buried river terrace sequence. Eleven terraces are preserved beneath alluvial fan sediments that are, in turn, capped by basaltic lava flows. Using the available geochronology these terraces are considered to represent sedimentation–incision cycles which span the period ∼1.67–1.2 Ma. Although progressive valley incision is a fluvial system response to regional uplift, the frequency of terrace formation within this time period suggests that the terrace formation resulted from sediment/water supply changes, a consequence of obliquity-driven climate changes. The production of sub-parallel terraces suggests that during this period the river was able to attain a quasi-equilibrium longitudinal profile adjusted to the regional uplift rate. Thus, the incision rate of 0.16 mm a−1 during this period is believed to closely mirror the regional uplift rate.After the onset of volcanism at ∼1.2 Ma, there is a destruction of the dynamic link between fluvial system behaviour and climate change. The repeated damming of the trunk river and its tributaries led to the construction of complex stratigraphic relationships. During the first phase of volcanism the palaeo-Gediz river was dammed on numerous occasions leading to the formation of a series of lakes upstream of the dams in the palaeo-Gediz valley. Variations in lake level forced localised base-level changes that resulted in complex fluvial system response and considerable periods of disequilibrium in profile adjustment. Furthermore, response to these base-level changes most likely disrupted the timing of the incisional adjustment to the on-going regional uplift, thus making the use of this part of the archive for inferring regional uplift rates untenable. 相似文献
16.
Aseismic crustal-strain signals prior to the 2003 Mw 6.8 Chengkung, 2006 Mw 6.1 Taitung, and 2008 Mw 5.0 Antung earthquakes with epicenters located 20, 55 and 11 km, respectively, from the Antung radon-monitoring station have
been calculated using the radon anomalies recorded. Specifically, radon decreased from background levels of 791 ± 46, 762 ± 57,
and 735 ± 48 pCi/L to minima of 326 ± 9, 371 ± 9, and 480 ± 43 pCi/L prior to the 2003, 2006, and 2008 earthquakes, respectively.
The estimated aseismic crustal-strain maxima at the Antung hot spring during the rock dilation stage were 3.6, 2.7, and 1.3 ppm,
respectively. The v-shaped radon pattern recognized in all three anomalies is valuable for detecting the aseismic strain precursory
to disastrous earthquakes in the Antung hot spring which is situated in a brittle fractured aquifer of limited recharge surrounded
by ductile mudstone. 相似文献
17.
Radon measurements were made in the soil and spring/seepage water in and around an active landslide located along the Pindar river in the Chamoli District of Uttaranchal in Garhwal Lesser Himalaya, to understand the application of radon in geological disasters. The landslide is a compound slide i.e. a slump in the crown portion, and debris slide and fall in the lower part. The bedrock consists of gneisses and schists of the Saryu Formation of the Almora Group of Precambrian age. The presence of several small slump scars and debris slide/fall scars along the length of the slide indicates continuous downward movement. The radon concentrations in the present study are much lower in comparison to values reported from other regions. However, the present radon data show relative variation in the slide zone. The concentration of radon measured in landslide zones varies from 3.1 Bq/l to 18.4 Bq/l in spring water and from 2.3 kBq/m3 to 12.2 kBq/m3 in the soil gas of the debris. Along the section of the slide, the radon values in water and soil are slightly higher in the upper slopes i.e. toward the crown portion of the landslide as compared to the distal portion. The relatively low concentration of radon both in soil gas and water in the toe portion of the landslide may be due to the high porosity of the debris, which does not allow radon to accumulate in the soil and water, whereas, towards the crown portion, the high frequency of fractures increases the surface area due to particle size reduction, and the near absence of debris enhances the radon emanation in soil. 相似文献
18.
Graham T. Hancox 《Landslides》2008,5(2):177-188
The Abbotsford Landslide of 8 August 1979 occurred in an urban area of Dunedin, New Zealand, causing much damage to houses
and urban infrastructure. Rapid failure occurred after weeks of preliminary movements, resulting in the formation of a approximately
5 million m3 block slide. It caused the loss of 69 houses, with an overall cost of about NZ $10–13 million. After several months of investigations,
a commission of inquiry found that unfavorable geology (weak clay layers in a 7°-dip slope) was the underlying cause of the
landslide. An old sand quarry at the toe of the slope and a leaking water main above the slide area were found to be man-made
factors that contributed to the failure. Slope stability analysis showed that after sand excavation (approximately 300,000 m3), the water table had to rise 0.3 m less for failure to occur. Because the quarry closed 10 years before the landslide occurred,
it is concluded that a long-term rise in groundwater levels because of the increased rainfall over the previous decade and
leakage from the water main controlled the timing of the failure and, in this sense, are considered to have triggered the
landslide. 相似文献
19.
陡倾层状斜向岩层视向溃屈机制力学分析——以陕西山阳滑坡为例 总被引：2，自引：1，他引：1
以陕西山阳滑坡为例,分析了陡倾层状斜向岩层岩质滑坡的视向滑动特征、滑移-溃屈破坏模式与机制。基于梁板理论、层状板裂结构岩体弯曲-溃屈破坏的力学模型在考虑自重、地下水静水压力作用及斜倾层状山体视向滑动侧向摩阻力作用的影响下,采用岩体结构力学分析的方法建立了相应的力学模型;经过力学分析,推导出基于斜坡自重、地下水静水压力与侧向摩阻力作用下的陡倾层状斜向岩层斜坡溃屈段长度条件方程。为验证条件方程的正确性,以山阳滑坡为例进行了验算,最后得出与实际调查较一致的结果,为防御陡倾层状斜向岩层斜坡产生视向溃屈破坏提供依据。 相似文献
20.
This paper presents the study of a landslide induced by rainfall above a railway line in terms of site investigations, laboratory
tests, finite element, and limit equilibrium analyses. The purpose of the study is to identify the cause and failure mechanism
so as to prevent the recurrence of such failure. The slope concerned was composed of 3∼4 m thick fissured clay overlying highly
weathered mica marble interbedded with quartz schist. The slope was cut into two steps and was protected by a masonry revetment
and a thin masonry retaining wall at the toe. The region concerned suffered a whole month’s light drizzle in September, after
which a rainfall of an intensity of 80 mm (in 48 h) occurred 5 days prior to the failure that happened on October 5, 2004.
The rainfall infiltration and a failed drainage system behind the retaining wall resulted in high saturation of the clay and
finally led to an undrained failure. The short-term slope stability using total stress parameters was examined by the finite
element and limit equilibrium analyses. The factors of safety of the slope obtained by the finite element and limit equilibrium
analysis were 0.935 and 0.854, which are in agreement with the occurrence of failure. Since the slide took place through the
interface of the soil and rock, the exposure of rock has significant effect on the stability. 相似文献