共查询到18条相似文献，搜索用时 125 毫秒
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日照市东港区后村镇挪庄村崩塌地质灾害点高差大、坡度陡,危害对象多,自1998—2021年多次发生局部崩塌,造成道路破坏及房屋受损,严重威胁着人民群众的生命财产安全。本文通过现场调查、地质测绘及工程勘察等技术手段,查清了崩塌体失稳机理的主要原因,分析了现状稳定性,通过采用圆弧滑动条分法计算,计算出边坡稳定性系数为0.761,边坡属不稳定状态。通过边坡修整、砌筑挡土墙及截(排)水沟、防护和绿化工程等工程治理措施后,对坡面稳定性进行了计算,治理后的边坡满足规范要求的稳定安全系数。地质灾害治理工程带来的经济效益、社会效益及环境效益凸显。 相似文献
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高位危岩崩塌极具隐蔽性、突发性和灾难性,传统的接触式调查方法在安全性方面无法完全保障并且也难以彻底查清边坡上各危岩块体的空间分布及发育特征,因此如何安全快速准确地获取边坡面上关键地质信息,一直是崩塌地质灾害调查及评价研究中的难点之一,也是防灾减灾工作中极为重要的环节。以连云港市某矿区高陡岩质边坡为例,提出了一套基于无人机倾斜摄影技术的崩塌隐患早期识别及影响区划分方法体系,该方法体系通过倾斜摄影技术获取研究区高分辨率影像及构建三维高精度地质模型,在此基础上利用测线法提取并统计边坡优势结构面空间展布特征及相关参数,利用赤平投影法对矿区高边坡关键危岩块体失稳模式进行判别,在完成关键危岩块体稳定性评价并划分稳定等级的前提下使用Rocfall模拟最不利工况下崩落体失稳后的滚落运动特征,从而划分出不同级别的崩塌影响区,为最终的地质灾害防治提供依据。研究表明,无人机倾斜摄影技术在崩塌隐患早期识别、破坏模式分析、稳定性评价以及崩落体威胁范围划定等方面具有显著的可行性和优越性。所提出的基于无人机倾斜摄影技术的崩塌隐患早期识别及影响区划分方法体系具有重要的参考价值。 相似文献
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在大量的野外地质调查工作基础之上,采用赤平投影法分析了沉积岩地区岩石高边坡的潜在破坏模式,并运用极限平衡法计算边坡在此潜在破坏模式下的稳定性,对安全储备较低的采石场边坡提出削坡方案,同时配合有限元法对边坡的稳定性进行了分析和评价,指出岩层层面是影响沉积岩地区高边坡稳定性的最不利结构面,是调查和研究的重点。 相似文献
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基于可拓工程法的黄土路堑边坡稳定性评价方法 总被引：3，自引：0，他引：3
针对影响黄土路堑边坡稳定性因素的复杂性和模糊性,重视实践中的经验,将可拓工程方法与路堑边坡稳定性评价相结合,提出了路堑边坡稳定性评价的物元关联函数及物元关联度的计算方法。建立了适合可拓学理论的边坡稳定性分类标准,实现了定性与定量评价黄土路堑边坡的结合。实例评价结果与定值计算、工程实际调查结果一致。 相似文献
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《国土资源导刊(湖南)》2021,18(3)
红层在我国分布广泛,其边坡稳定性是工程建设中经常面临的问题。红层通常孕育顺层缓倾滑坡地质灾害,具有规模大、隐蔽性强、成灾机理多样等特点。本文以醴陵市鸭塘水库滑坡为例,对其形成机制进行了分析,对其稳定性进行了评价。评价结果表明水库长期渗水是该滑坡发展的一个重要因素,其稳定性与后缘裂隙贯通率、滑带泥化率及后缘裂隙充水高度密切相关,超过临界值,坡体将会失稳。对以后红层区库区选址、设计蓄水位确定、防渗处理工作具有一定指导意义。 相似文献
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近年来,东北界河乌苏里江我国一侧塌岸地质灾害频发,江岸侵蚀严重,对沿岸居民的生产生活造成严重影响。针对这一情况,利用多源、多尺度、多时相遥感数据及研究区地质图、地形图、地貌图,结合野外实地调查工作和GIS技术,提取了植被覆盖度、工程地质、地貌特征、护岸类型和剖面地质结构及研究区塌岸地质灾害数据,建立了河岸稳定性评价体系;采用似然比方法对饶河段河岸稳定性进行了定量评价,得到了河岸稳定性分区结果;并对分区结果的可靠性和精确性做了评价和验证,发现分区结果与实际情况具有较好的一致性。本研究基于多源地学数据,利用似然比开展河岸稳定性评价,对塌岸地质灾害调查、环境保护和防灾减灾具有重要的理论意义和现实价值。 相似文献
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济南市章丘区垛庄镇北明村东崩塌地质灾害点高差大、跨度长、危害对象多,于2021年7月发生过几次局部崩塌,造成多户房屋受损,给人民的生命财产安全造成了严重的危害。本文从崩塌发育现状着手,通过现场调查、岩土工程钻探、坑探揭露等手段对崩塌体特征进行了分析,从边坡岩土体特征内在条件和降雨、植物根劈等外在因素综合研究了地质灾害形成机理。按照Bishop法圆弧稳定分析,计算边坡稳定系数Fs=0.998<1.0,边坡属欠稳定状态。探讨了避让搬迁、工程治理、群测群防、自动监测等几种地质灾害防治对策,以期为类似地质灾害的治理提供参考。 相似文献
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Reservoir-landslide hazard assessment based on GIS: A case study in Wanzhou section of the Three Gorges Reservoir 总被引：2，自引：1，他引：1
Reservoir-landslide is mainly caused by changes in hydrodynamic conditions of slope interior at the time of water storage or discharge. The current study mainly focuses on the typical reservoir landslide, but the sudden occurrence of some unknown landslides brought a lot of difficulties for hazards prevention. Therefore, we proposed a method to evaluate the regional scale reservoir-landslide hazard. We took Wanzhou section of Three Gorges Reservoir （China） as the study area and systemically and synthetically carried out the reservoir-landslide hazard evaluation under the condition of water level regulation. Firstly, we made reservoir-landslide susceptibility assessment by using the methods of spatial analysis and statistics based on geological and geomorphological materials and field survey data, and then, analyzed the regional-scale slope stability based on the infinite slope model used to analyze the bank slope stability change under the condition of water fluctuation, finally, developed a reservoir-landslide hazard evaluation model based on the results of susceptibility and stability. The hazard evaluation model was used to predict and evaluate the hazard change under the role of water level regulation. The results showed that the landslide hazard of the whole region decreased during water storage, landslide hazards increased during water discharge. The faster the regulation speed, the greater the slope hazard. The results can provide the basis for hazard management and regional land-use planning. 相似文献
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《山地科学学报》2021,(10)
On 28 th July 2018, a massive landslide occurred in a mountainous area in Northern Thailand. The landslide after ten days of heavy rainfall generated the movement of uphill mountain soil into the populated village. This study presents a comprehensive failure analysis of local rainfallinduced landslides based on topographical and geological information. Rainfall measurement data were gathered from two rainfall stations close to the study area. The rainfall records show that the total monthly rainfalls in 2018 were significantly higher than the average monthly rainfalls over the past decade. Site investigation started with an unmanned aerial photogrammetric survey to generate a digital elevation model. Then, dynamic probing test, microtremor survey, and electrical resistivity survey were carried out along undisturbed soils beside the failed slope to evaluate the thickness of the soft soil cover on top of the rock basement. During the site survey, residual soil samples were collected to determine engineering properties in the laboratory. Finally, a slope stability analysis was performed to assess the landslide hazard based on the results of aerial photogrammetric survey, field exploration, and laboratory tests. The slope stability analysis and rainfall records revealed that the Huay Khab landslide was mainly caused by an increase in the water content of residual soils due to the prolonged rainfall which led to a sharp decrease in the shear strength. This leads to the conclusion that the proposed landslide investigation program could be used to assess the potential of landslide failure due to prolonged rainfall on a local scale. 相似文献
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There is a great difference between the distribution and evolvement characteristics of slope geological hazard in the same geographical location and climatic conditions,taking the similar structural-genetic connection in Wudongde reservoir area of Jinshajiang River valley for example.In all engineering geological conditions,the chronologic age and attitude of strata,and the lithologic association factors control the distributions and evolvement characteristics of slope geological hazard in the studied area.The study shows that the slopes in geological evolution are in different stages.The conclusion helps to understand the types and the intensity of geological disasters. 相似文献
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The excavated height of the left bank slope of the diversion power system intake in Jinchuan hydropower station is about 16o m. The stability and safety of the slope during construction and its operation/utilization become one of the most important geological engineering problems. At the same time, it is also crucial to select a safe and economic excavation gradient for the construction. We studied the problem of how to select a safe and economic slope ratio by analyzing the geological condition of the high slope, including the lithology, slope structure, structural surface and their combinations, rock weathering and unloading, hydrology, and the natural gradient. The study results showed that the use of an excavation gradient larger than the gradient observed during site investigation and the gradient recommended in standards and field practice manuals is feasible. Then, we used the finite element method and rigid limit equilibrium method to evaluate the stability of the excavation slope under natural, rainstorm and earthquake conditions. The calculated results showed that the excavated slope only has limited failure, but its stability is greatly satisfactory. The research findings can be useful in excavation and slope stabilization projects. 相似文献
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With the rapid development and expansion of the cities in China, the carrying capacity of resource and environment has become a huge concern for local governments. From the perspective of geological environment, geological disasters are the main restraining factor of the development in mountain cities. This study was conducted in Suide County of Shaanxi Province with a risk-based approach as followed: a hazard analysis on geological disasters based on a slope geological survey at a scale of 1:10,000; a consequence analysis based on unmanned aerial vehicle (UAV) aerial survey data; integrating the results of hazard analysis and consequence analysis, a risk zonation and analysis of geological disasters in urban areas were completed considering urban planning, land use planning and the safety of infrastructure and major engineering. Subsequently, taking the acceptable levels of human life and property risks incurred by landslides as the criteria of the evaluation of geological environment carrying capacity, a comprehensive assessment of current and future urban carrying capacity was conducted based on the results of the risk analyses. Accordingly, the prior development zone, the restricted development zone and the prohibited zone were delineated, with corresponding suggestions for future urban development. The technological and methodological system used in the study can be applied to geological environment carrying capacity evaluation of other important mountain cities, which can provide scientific basis for the optimization of land and space. 相似文献