共查询到20条相似文献，搜索用时 46 毫秒
1.
Chen Qiang 《《地质学报》英文版》1988,62(2):127-140
Listric faults of different levels and scales are widely developed in the lithosphere. According to theirtectonomechanical geneses. the author divides listric faults into primary and secondary ones. and the formermay be subdivided into gravity-gliding listric faults, regional extensional listric normal faults. regionalcontractional reverse listric faults and deep-seated ductile listric faults, By means of the slip-line field theorydealing with Mohr's criterion expressed by quadratic limiting curves. the author has preliminarily determinedthe occurrences. patterns and mechanical properties of various types of listric faults during their formation. andhas analyzed their tectonic evolution and related dynamic processes in the lithosphere. 相似文献
2.
Discrete Element Analysis of Huangtupo Landslide 总被引：5，自引：0，他引：5
On the basis of the deep geology and the geological structure of Huangtupo landslide,and ancient landslide in the reservoir of the Three Gorges,the geo-environmental model of the landslide is es-tablished to analyze quantitatively the sliding mechanism by using the discrete element method.It is con-cluded that interbedding structure of soft and hard formation consists of the main geological background,which induced the arching of the formation under gravity.Stability analysis of different loadings shows that the ground building weight on the middle slope may restrain the extension of shear sliding zone be-low,but may activate the foot area which will reduce the safety factor of the front. 相似文献
3.
Sun Jinzhong College of Engineering Technology China University of Geosciences Beijing Tan Hanhua Guizhou Institute of Communication Design Guiyang Qi Shengwen Institute of Geology Chinese Academy of Sciences Beijing 《中国地质大学学报(英文版)》2001,12(2)
ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｃａｕｓｅｏｆｉｔｓｓｉｍｐｌｅｏｐｅｒａｔｉｏｎａｎｄｌｏｗｃｏｓｔａｓｗｅｌｌａｓｅｆｆｅｃ ｔｉｖｅｎｅｓｓｆｏｒｍａｎｙｐｒｏｊｅｃｔｓ ,ｈｅａｖｙｔａｍｐｉｎｇｈａｓｂｅｅｎｕｓｅｄｗｉｄｅｌｙｉｎｔｈｅｗｏｒｌｄ (Ｑｉａｎｅｔａｌ.,1986 ) .Ｈｏｗｅｖｅｒ,ｔｈｅｓｔｒｏｎｇｖｉｂｒａｔｉｏｎｉｎｓｏｉｌｍａｓｓｃａｕｓｅｄｂｙｈｅａｖｙｔａｍｐｉｎｇｍａｙｂｅｈａｒｍｆｕｌｔｏｂｕｉｌｄｉｎｇｓ,ｉｎｓｔｒｕｍｅｎｔｓａｎｄｅｖｅｎｈｕｍａｎｂｏｄｉｅｓａｒ… 相似文献
4.
Xu Yingzi Zhang Baiqing Tang Huiming 《中国地质大学学报(英文版)》2005,16(3):271-276
With the rapid development of water facilities, hydroelectric projects, highways and railways in China, beam-anchor reinforcement has been widely used to stabilize slopes in recent years. But the theory for the design of beam-anchor reinforcement is far behind the application. Cross beam-ground anchor reinforcement is a combination of beams and anchors forming a new structure to prevent slope sliding. The forces in the beams are discussed using theoretical analysis and numerical modeling. The Winkler model is used to analyze the beams, and reasonable values of λ, length, spacing and cantilevered length for the beams are determined through a theoretical analysis. A three-dimensional finite element method is adopted to model the interaction of the beams and soils and a structure analysis is applied to treat the beams and to study the stress distribution in external and internal beams. The analytical results show that it is better to satisfy λ≥2π, the spacing between anchors ls should be lsλ<π/2 and cantilever length should be (0.3-0.5)ls for the optimum design. The numerical results show that the same design can be used for all beams in different directions, including the internal and external beams. The application of the analytical method for reinforcement beam analysis is acceptable. It is better to choose a safety coefficient of 1.3 for design based on the analytical method for safety. 相似文献
5.
Water is the most active component in all geological systems.It has an important effect on the physical properties of minerals and melts.It also plays a key role in the evolution of the Earth.Accurate thermodynamics data on water are currently confined to pressures below 1.0GPa and temperatures below 900℃.Presented in this paper are new data available on the P-T properties of water at pressures up to 5.0GPa,develoged from differential thermal analysis and ultrasonic wave amplitude analysis.It has been found that there may exist another ternary point at 3.0GPa and that ultrasonic wave amplitude change of ice-water transition shows two inflection points above 2.0GPa, consistent with the two peaks of differential thermal curves above 2.0GPa .It may be a new phenomenon which needs further study. 相似文献
6.
This paper establishes the phase space in the light of spacial series data,discussesthe fractal structure of geological data in terms of correlated functions and studies thechaos of these data.In addition,it introduces the R/S analysis for time series analysisinto spacial series to calculate the structural fractal dimensions of ranges and standard de-viation for spacial series data,and to establish the fractal dimension matrix and the proce-dures in plotting the fractal dimension anomaly diagram with vector distances of fractal di-mension.At last,it has examples of its application. 相似文献
8.
Zhang Zhongxian Xu Lin Tang JiaxiangCollege of Civil Engineering Huazhong University of Science Technology Wuhan 《中国地质大学学报(英文版)》2001,12(3)
ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｏｎｓｔｒｕｃｔｉｏｎａｃｃｉｄｅｎｔｓａｒｅｄｉｆｆｅｒｅｎｔｆｒｏｍｅａｃｈｏｔｈｅｒｉｎｔｅｒｍｓｏｆｃｈａｒａｃｔｅｒｓ,ｆｏｒｍｓ,ｃｏｍｐｏｎｅｎｔｌｏｃａｔｉｏｎｓａｎｄｔｈｅｉｒｉｎｆｌｕ ｅｎｃｅｓｏｎｃｏｎｓｔｒｕｃｔｉｏｎｆｕｎｃｔｉｏｎ ,ｅｓｐｅｃｉａｌｌｙｓａｆｅｔｙ .Ｔｈｅｑｕａｌｉｔｙａｃｃｉｄｅｎｔｏｆｃｏｎｓｔｒｕｃｔｉｏｎｅｎｇｉｎｅｅｒｉｎｇｗｉｌｌｄｏｇｒｅａｔｄａｍａｇｅ ,ｓｕｃｈａｓｃｒａｃｋ ,ｇｒｅａｔｄｅｆｌｅｃｔｉｏ… 相似文献
9.
The study examines the synoptic situations and weather conditions under which occurred Israel's largest forest fires between
the years 1987–1995. Annual rainfall and maximum temperature were found to have a positive correlation with both the size
of the burnt area and the frequency of fires. A negative correlation was found for the relative humidity at 12 UTC for the
same parameters. The fire season in Israel starts in May and ends in November, the peak months being May, June and July. No
large fires were observed during the rainy season, December–February, despite the relatively low precipitation characterizing
the region. Atmospheric disturbances as well as quasi-stationary systems were found to be favorable for the development of
forest fires in Israel: the North African (‘Sharav’) cyclone and the Red Sea trough, which are common during spring and autumn.
These systems carry hot, dry air from the deserts and are responsible for 55% of the burnt area from major forest fires in
Israel and up to 33% of the major forest fires. Sixty-five percent of the forest fires occurred during the summer all of them
under the quasi-stationary system of the Persian Gulf trough. These fires did not spread as widely as those that occurred
under the North African cyclone and the Red Sea trough systems. The role of weather in the propagation of fire is exemplified
in the case study of the ‘Sha'ar ha Gai’ fire of July 1995 — the biggest forest fire in the history of Israel (1300 ha).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Stanislav FRANCISKOVIC-BILINSKI Halka BILINSKI Delko BARISIC Nada HORVATINCIC Institute Ruder BoSkovi POB HR- Zagre Croati E-mail: francis@rudjer.irb.hrand YUAN Daoxian Institute of Karst Geology Guilin Guangxi China 《《地质学报》英文版》2003,77(2):267-275
The paper presents an analysis of characteristic karst tufa from Guangxi, China, which has not been studied before. A comparison with tufa from Dinaric Karst of Croatia is discussed in view of the C-type climate. The major mineral is calcite. Minor minerals are quartz and dolomite, depending on location. The content of calcium carbonate varies from 65% to 92%, and that of magnesium carbonate from 0.03% to 1.77%. Among other elements, the most abundant are Fe, from 0.02% to 1.50%, and Ti, from 0.15% to 0.27%. Many other trace elements (V, Cr, Mn, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Y, Zr, Hg and Pb) are also present. Specific activity of radionuclides 40K, 232Th, 137Cs, 226Ra and 238U varies from sample to sample. Concentration of U in tufa is close to that reported for sedimentary carbonate. Low concentration of 137Cs indicates that this part of the world was not exposed to nuclear explosions. The concentration of 226Ra is the highest in Mashan County. The ratio 238U/226Ra (0.21-0.71) in tufa from Mashan Co 相似文献
11.
A new aproach to isotopic analysis of carbon,oxygen,sulfur and nitrogen in microsamples has been established.Samples were conventionally prepared by mixing microsamples to be analyzed with reference samples with known δ values in a proper proportion,and then analyzed for their stable isotopes as those at ordinary levels.According to the equilibrium relationships before and after mixing,the δvalues of unknown microsamples were calculated.The δ^15N of the atmosphere was estimated at zero by this approach,which is concordant with the internationally recommended value. 相似文献
12.
Please refer to the attachment(s) for more details. 相似文献
13.
Xie Xinong Jiao Yangquan Faculty of Earth Resources China University of Geosciences Wuhan 《中国地质大学学报(英文版)》1997,(1)
Ｔｅｃｔｏｎｏ┐ＳｔｒａｔｉｇｒａｐｈｉｃＡｎａｌｙｓｉｓａｎｄＧｅｏｄｙｎａｍｉｃＢａｃｋｇｒｏｕｎｄｏｆＭｅｓｏｚｏｉｃＳｏｎｇｌｉａｏＢａｓｉｎ＊ＸｉｅＸｉｎｏｎｇＪｉａｏＹａｎｇｑｕａｎＦａｃｕｌｔｙｏｆＥａｒｔｈＲｅｓｏｕｒｃｅｓ，Ｃｈｉｎ... 相似文献
14.
INTRODUCTIONThe design methods of asphalt pavement areusually based on the static and elastic analysis sys-tem,though the actual loads such as wheel loads andtemperatureloads are kinetic.The mechanic responseof the pavement is sensitive to the ti me-dependentvariables.Thereis an obvious difference betweentheresults obtainedfromthe kinetic systemandthe stat-ic system.Thus,the dynamic analysisis necessarytodescribe explicitly the working condition of the as-phalt pavement.The dynamic charac… 相似文献
15.
Yang Jun* Li Li Fan Aiwu School of Civil Engineering Mechanics Huazhong University of Science Technology Wuhan China 《中国地质大学学报(英文版)》2005,16(4):349-353
Theapplicationofreinforcedconcrete(RC)shear wallbuildingsisquitecommoninseismicare as.Shearwalls,withlargerigidityandhigh strength,aretheprimarymembersforresistinghori zontalloadsinbuildingstructures.Butunderthe forceofasevereearthquake,shearwallsareprone… 相似文献
16.
de Souza Andriele Nascimento da Silva Aline Ribeiro Santos Olavo F. de Freitas Neto Osvaldo 《Geotechnical and Geological Engineering》2022,40(3):1565-1583
Geotechnical and Geological Engineering - The Armando Ribeiro Gonçalves Dam, popularly known as The Açu Dam, is an important geotechnical construction in Rio Grande do Norte state,... 相似文献
17.
The paper is dedicated to the review of methods of seismic hazard analysis currently in use, analyzing the strengths and weaknesses of different approaches. The review is performed from the perspective of a user of the results of seismic hazard analysis for different applications such as the design of critical and general (non-critical) civil infrastructures, technical and financial risk analysis. A set of criteria is developed for and applied to an objective assessment of the capabilities of different analysis methods. It is demonstrated that traditional probabilistic seismic hazard analysis (PSHA) methods have significant deficiencies, thus limiting their practical applications. These deficiencies have their roots in the use of inadequate probabilistic models and insufficient understanding of modern concepts of risk analysis, as have been revealed in some recent large scale studies. These deficiencies result in the lack of ability of a correct treatment of dependencies between physical parameters and finally, in an incorrect treatment of uncertainties. As a consequence, results of PSHA studies have been found to be unrealistic in comparison with empirical information from the real world. The attempt to compensate these problems by a systematic use of expert elicitation has, so far, not resulted in any improvement of the situation. It is also shown that scenario-earthquakes developed by disaggregation from the results of a traditional PSHA may not be conservative with respect to energy conservation and should not be used for the design of critical infrastructures without validation. Because the assessment of technical as well as of financial risks associated with potential damages of earthquakes need a risk analysis, current method is based on a probabilistic approach with its unsolved deficiencies.
Traditional deterministic or scenario-based seismic hazard analysis methods provide a reliable and in general robust design basis for applications such as the design of critical infrastructures, especially with systematic sensitivity analyses based on validated phenomenological models. Deterministic seismic hazard analysis incorporates uncertainties in the safety factors. These factors are derived from experience as well as from expert judgment. Deterministic methods associated with high safety factors may lead to too conservative results, especially if applied for generally short-lived civil structures. Scenarios used in deterministic seismic hazard analysis have a clear physical basis. They are related to seismic sources discovered by geological, geomorphologic, geodetic and seismological investigations or derived from historical references. Scenario-based methods can be expanded for risk analysis applications with an extended data analysis providing the frequency of seismic events. Such an extension provides a better informed risk model that is suitable for risk-informed decision making. 相似文献
18.
The System Analysis and Reliability Evaluation of Rock Slopes 总被引：1，自引：0，他引：1
Luo Guoyu Yan ChanghongDepartment of Earth Sciences Nanjing University Nanjing Jiangsu Fei Zhenbi 《《地质学报》英文版》1994,68(4)
The principal of preferred plane analysis is a new research view and model of rock slope engineering geology. It advocates that the rock slope stability, boundary conditions and failure model are controlled by preferred planes. Therefore, the problem of slope stability evaluation can be converted into the search for preferred planes and determination of preferred separating bodies. The organic combination of the deterministic model and the indeterministic model can be realized by applying the systems engineering principle and the research model and method of reliability analysis in the quantitative evaluation and prediction of rock slope stability. Finally, the paper presents the case studies of slopes of the Yangtze Gorge Project and the Ma'anshan openpit mine. 相似文献
19.
Ye Zhang 《Mathematical Geosciences》2009,41(2):145-162
A hierarchical geostatistical analysis is conducted on a high-resolution, multiscale hydraulic conductivity (ln K) map, created by scaling up an experimental stratigraphy. Unlike a previous study which evaluates ln K variograms within individual depositional environments, this study analyzes deposits (or samples) that incorporate multiple
depositional environments. Based on conductivity cutoffs selected from a global ln K histogram, an indicator map is created to divide the deposits into 4 categories: sand, silty sand, clayey silt, and clay
(Hierarchy-I). Based on facies and facies assemblage types selected using geological criteria, two more indicator maps are
created at a higher hierarchy (Hierarchy-II) to divide the deposits into 14 units and 2 units, respectively. For each sample,
its experimental ln K variogram is decomposed into 4 auto- and cross-transition component variograms. The decomposition characteristics are then
evaluated against the underlying heterogeneity and specific division rule. The analysis reveals that: (1) ln K cutoffs (sand contents of the physical stratigraphy) can be used to distinguish the shifts in dominant deposition mode; (2) sample
univariate modes depend on the choice of hierarchical division; (3) sample variograms exhibit smooth-varying correlation structures
(exponential-like variograms are observed in samples with a large variance in mean facies length); (4) the decomposition characteristics
are sensitive to the division based on conductivity cutoffs, but not sensitive to the division based on depositional environment
(For all samples, with appropriate division, the sample variogram is closely approximated by the sum of the cross-transition
component variograms.); and (5) at the Hierarchy-II level, the 2-unit division gives similar decomposition characteristics
as the 14-unit division. For the select samples, parsimony in hierarchical division is achieved at the facies assemblage scale. 相似文献
20.
Hao Tongchun Zhong Liguo Liu Jianbin Zhang Xiaocheng Zhang Lei 《Mathematical Geosciences》2023,55(2):201-228
Mathematical Geosciences - The relationship between injection and production wells is a major component of reservoir evaluation and the foundation for establishing an efficient oilfield development... 相似文献