摘要
从滑坡的地质环境入手,通过地质调研及测绘,分析曾家包包大型基岩滑坡的特征、控制因素及成因机制,并运用Sarma法及不平衡推理法、毕肖普法对滑坡稳定性极限平衡进行计算分析。在此基础上,对在现今应力场作用下滑坡的稳定性采用了有限元模拟,并对模拟的结果进行分析,得出在天然条件下曾家包包滑坡曾处于稳定状态,岩体中的软弱夹层经长期持续的地下水浸润软化逐渐泥化形成倾角上陡下缓的贯通性滑移面,在雨季降雨异常集中期,岩体排水不畅形成较高的空隙水压力,斜坡岩体就会沿滑移面发生顺层滑移,从而形成大型基岩滑坡。
Starting with geological environment of a slide, by geological research and study and mapping, this paper analyze character and controlling factor and genesis mechanism of large Zengjiabaobao bedrock slide。And it calculates and analyzes limit balance of stability of the slide by Sarma and Imbalance reasoning and Besopke method。On the basis of it, this paper simulates stability of the slide in the present stress field by Finite element and analyzes the result of simulation。At last, it arrives at the conclusion that in the natural condition, the Zengjiabaobao slide was ever stable , and weak interlayer of rock mass that is chronically and continually soaked by water and gradually argillaceous forms the perforated slip plane。When it very concentrically rains in the rainy season, rock mass form upper interstice hydraulic pressure because of non free drainage, so the rock mass of slope slides along the slippage plane in the same direction as the layer and form the large bedrock slide。
出处
《山地学报》
CSCD
北大核心
2005年第3期342-347,共6页
Mountain Research
基金
国家自然科学基金重大项目资助(编号:90102002)~~
关键词
基岩滑坡
成因机制
岩体稳定性
<Keyword>bedrock slide
genesis mechanism
rock mass stability
