工程地质学报Issue(6)：878-884,7.
地下水与开挖作用下堆积层滑坡体滑动机制分析
LANDSLIDE MECHANISM OF QUATERNARY DEPOSITS WITH HORIZON-TAL BEDDINGS UNDER GROUNDWATER AND SLOPE EXCAVATION
摘要
Abstract
Landslides of quaternary deposits along the gentle bedrock-cover interface frequently occur during the construction of Bazhong-Dazhou-Wanzhou expressway.Strengths of unsaturated soils affected by groundwater and excavation are the two main factors of the landslides.On the basis of unsaturated direct-shear tests,the unsaturated-analysis soft wares of SEEP/W and SIGMA/W are used in the analysis of sliding mechanism.The results shows that distribution of groundwater seepage produces the soft soil along the bedrock-cover interface.The distribution of groundwater seepage leads to the distribution of matric suction which causes the deterioration of shear strength from top to bottom.Eventually,the soft soil with the weakest strength distributed along the bedrock-cover interface.With the cutting of the deposits with horizontal beddings,the soft soil apparently surrenders and deforms.Tension failures appear at the back of landslide;the middle part of landslide creeps along the bedrock-cover interface;shear-com-pression occurs in the front of landslide;and groundwater gradually dissipates.关键词
堆积层滑坡/地下水/非饱和强度特征/开挖/滑动机制Key words
Accumulation horizontal landslide/Groundwater/Unsaturated strength characteristic/Excavation/Sliding mechanism分类
天文与地球科学引用本文复制引用
马春驰,李天斌,陈国庆,贾逸..地下水与开挖作用下堆积层滑坡体滑动机制分析[J].工程地质学报,2013,(6):878-884,7.基金项目
交通运输部西部交通建设科技项目（20113188051090），国家自然科学基金（41272330），成都理工大学优秀创新团队培育计划（HY0084）资助． （）
