【作者】 燕军军；

【导师】 孙进忠； 韩金良；

【作者基本信息】 中国地质大学（北京） ， 地质工程， 2011， 硕士

【摘要】 黄土滑坡是黄土地区最为严重的地质灾害。由于黄土所特有的物质组成和工程性质,使得黄土滑坡的形成条件和机理表现出复杂性和多变性。宝鸡地区黄土滑坡灾害较为严重,严重的威胁到了居民的正常生产生活,制约了当地的社会经济发展。因此,宝鸡地区的黄土滑坡研究,既有一定的理论意义,也有巨大的社会效益。本文采用现场勘查、室内试验、数值模拟等技术手段,对陈仓区簸箕庄滑坡的形成条件,形成机理,稳定状态及危害程度进行了深入研究,具体内容如下:（1）运用工程地质学知识分析陈仓区环境地质条件,研究陈仓区滑坡发育特征及时空分布特征。结果表明区内滑坡空间分布具有群发性,分布区域与地貌单元有关,大多数黄土滑坡的发生与降雨相关。（2）结合簸箕庄滑坡基本特征,地层岩性、室内试验等手段,发现地形地貌、物质组成、降雨强度和持续时间是影响簸箕庄滑坡稳定状态的最主要因素。大气降水主要作用为降低土体强度、增加土体容重及软化潜在滑动面。在此基础上研究簸箕庄滑坡滑动机理,认为簸箕庄斜坡初始变形破坏以前缘崩塌为主,后两次变形破坏主要为滑动破坏,且高强度的降雨为后两次变形破坏的主要触发因素。（3）使用FLAC^3D软件对滑坡形成过程进行模拟,深入分析滑前坡体应力-应变情况,验证滑坡形成条件及机理。同时用G-Studio软件模拟簸箕庄滑坡在降雨条件下的渗流情况,计算结果为簸箕庄滑坡在自然状态下稳定,降雨时稳定性急剧降低,且持续性降雨对簸箕庄滑坡稳定性的影响最大。根据数值模拟的位移增量及剪应变增量分布图,可以判别滑坡失稳的区域。（4）针对簸箕庄滑坡目前的稳定状态,对簸箕庄村是否需要搬迁提出意见,并提出一些防治建议。更多还原

【Abstract】 Loess landslide is the most serious geological hazard in the loess region. Owing to the exceptive of loess material composition and engineering property, the formation condition and mechanism of loess landslide are complicated and diverse. Serious loess landslide hazards have restricted local economic development in baoji district. Therefore, it is significant to study on the failure mechanism and stability of loess landslide in-depth. Failure mechanism, sliding situations and stability of bojizhuang landslide are studied in this paper by means of field investigation, laboratory test and numerical simulation. The concrete content is as follow:(1) Through the geological environment of chencang district, time distribution and spatial distribution of the landslide are analyzed. The conclusion is a large number of landslide lies in the river, and these rivers tributary bank. Most of loess landslide are related to rain.(2) On the analysis of the basis feature, lithology, laboratory test of bojizhuang landslide,we discovered that geographical, composition, rainfall intensity are the most factors affect the stability of bojizhuang landslide. Primary role of rainfall is reducing soil strength, increasing soil density and softening the potential sliding surface. On this basis, concluded the mechanism of bojizhuang landslide, the initial slope deformation is collapse, the secondary deformation is main in sliding, and are triggered by rainfall.(3) Use FLAC3D software to simulate the formation of bojizhuang landslide, analysis the distribution of stress-strain state,to verify the conditions and mechanism of landslide formation. Analysis the seepage of bojizhuang landslide under rainfall conditon, the result is that in nature the landslide is in steady state, but the stability will drastically reduced in rainfall, especially in the persistent rainfall. Based on the displacement increment and the shear-strain distribution, the slide area can be distinguished.(4) According to the status of bojizhuang landslide, some suggestions about the moving plan of bojizhuang village and the control measurements of the landslide are put forward.更多还原