工程地质学报2016，Vol.24Issue(4)：510-518,9.DOI:10.13544/j.cnki.jeg.2016.04.004
镇雄赵家沟滑坡特征及基于坡体结构的失稳机理研究
CHARACTERISTICS OF ZHAOJIAGOU COLLUVIUMS LANDSLIDE AND ITS FAILURE MECHANISM ON SLOPE STRUCTURE, ZHENXIONG COUNTY
摘要
Abstract
On January 1 1 ,201 3,a super catastrophic landslide took place in Zhaojiagou village of Zhenxiong County,Yunnan Province,and made 46 people died and serious economic losses.Based on multiple in-situ investigations and geologic survey,the landslide features and its failure mechanism are studied in the paper.The landslide took place in a natural accumulation slope mainly composed of colluviums and diluvium,and the slope structure has the characteristics of increasing in clay content and denseness but decreasing in porosity and permeability from slope crown to its foot.The main scarp developed along the steep interface of the accumulations and the strongly weathered sandstone bedrock,while the sliding belt developed along the soft layer of diluvium. Before the landslide there already existed a remarkable tension crack in current main scarp and a compression failure in the slope front,which typically is the failure mechanism of Creep-Crack.The main landslide body moved first and the 3 small landslides followed in its left and right flanks as well as the back slopes,and the landslide debris moved in belts.The natural water content of the sliding belt is very close to its liquid limit,and its plastic index is more than 1 0,which means that the soil is in the liquefied-plastic state and with low shear strength.The high speed at the moment of departure is the result of the long-term accumulation of strain energy but instantly releasing,the high speed during movement is related with the liquefaction of the landslide debris and the bed soil, and there exists proofs of debris flying.It is suggested to strengthen the deformation monitoring of adjacent slopes and the geohazard forecasting of similar accumulation slopes in Wumengshan region.关键词
崩坡积体/蠕滑-拉裂/高速远程滑坡/滑动带/失稳机理/云南镇雄Key words
Colluviums and diluvium slope/Creep-crack mode/High-speed and long run-out landslide/Sliding belt/Failure mechanism/Zhenxiong county of Yunnan province分类
天文与地球科学引用本文复制引用
曾庆利,王炜风,陈宏宇,薛鑫宇,袁广祥..镇雄赵家沟滑坡特征及基于坡体结构的失稳机理研究[J].工程地质学报,2016,24(4):510-518,9.基金项目
国家自然科学基金主任基金项目(编号41440022)和面上项目(编号40972199)资助． （编号41440022）
