库水下降作用下滑坡动态变形机理分析——以三峡库区白水河滑坡为例  

STUDY ON DYNAMIC DEFORMATION MECHANISM OF LANDSLIDE IN DRAWDOWN OF RESERVOIR WATER LEVEL——TAKE BAISHUIHE LANDSLIDE IN THREE GORGES RESERVOIR AREA FOR EXAMPLE

作　　者：卢书强 易庆林 易武 张国栋 何祥 

机构地区：[1]三峡地区地质灾害与生态环境湖北省协同创新中心,宜昌443002 [2]湖北长江三峡滑坡国家野外科学观测研究站,宜昌443002 [3]湖北省地质灾害防治工程技术研究中心,宜昌443002

出　　处：《工程地质学报》2014年第5期869-875,共7页Journal of Engineering Geology

基　　金：湖北省自然科学基金(2012FFA040;2012FFB03804);湖北省教育厅科学技术研究项目(D20121304);地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2012K032)资助

摘　　要：在每年的库水位下降期间,三峡库区的许多滑坡都出现了较大变形。为了深入研究库水下降作用下滑坡的动态变形机理,评价和预测此类滑坡的稳定性及发展趋势,本文以白水河滑坡为例,在现场地质调查和详细地质勘查的基础上,充分利用十多年监测数据,分析其变形特征、失稳机理、影响因素及稳定性,预测了其变形发展趋势。研究结果表明在水库水位下降的过程中,由于滑坡岩土体渗透性能较差,地下水来不及及时排出,滞后于水库水位的下降,滑坡受到了坡体内地下水向外的渗透动水压力作用,从而使得滑坡稳定性降低。另外库水位下降速度越快,滑坡的位移速率也越大,表现出"阶跃型"动态变形特征。Many landslides in the Three Gorges Reservoir area have large deformation during the drawdown of reservoir water level every year.In order to study the dynamic deformation mechanism,stability and development trend of landslide during drawdown of reservoir water level,this paper takes Baishuihe landslide as an example.Based on the field geological survey,detailed geological exploration,and full use of monitoring data of more than ten years,the deformation characteristics,mechanism,influence factors and stability of landslide are analyzed in detail,and the deformation trend of landslide is predicted.Analysis results show that,during the drawdown of reservoir water level, underground water can not be discharged in time due to the landslide soil permeability is poor.Because decline speed of groundwater is much slower than that of reservoir water,increasing the seepage force in the landslide body apparently, and then further reduces the slope stability.The landslide deformation rate increases with the increasing of decline speed of reservoir water level,and the landslide deformation shows dynamic characteristic of step type.

关 键 词：动态变形 机理分析 三峡库区 白水河滑坡 稳定性预测 

分 类 号：P642[天文地球—工程地质学]