三峡库区白水河滑坡变形特征及影响因素的阶段分析

Periodic Analysis of Deformation Characteristics and Influential Factors of Baishuihe Landslide in Three Gorges Reservoir Area

为研究三峡库区库岸滑坡的变形特征及主要影响因素,以三峡库区白水河滑坡为研究对象,通过滑坡全球定位系统(GPS)位移监测数据,结合降雨及库水位资料,依据库区蓄水过程,分三阶段定性分析滑坡的变形特征和影响变形的主要因素.结果表明:滑坡变形集中在每年的5~8月份,呈阶跃式变形;降雨和库水位变化为影响滑坡变形的主要因素;从第一阶段(200306~200608)降雨为滑坡变形的主导因素,第二阶段(200609~200808)降雨为主要影响因素,库水位变化有一定影响,到第三阶段(200811~今)降雨和库水位变化共同影响滑坡变形.研究说明:降雨强度较滑坡累积变形表现出较强关联性,库水位的波动对累积位移的影响并不明显;降雨强度越大,累积位移曲线上升幅度越大.

In order to study the deformation characteristics and main influencing factors of the reservoir bank landslide in the Three Gorges Reservoir area, the Baishuihe landslide is taken as the research object. Based on the data of global positioning system（GPS） displacement monitoring, rainfall and reservoir water levels in re- cent years dividing the reservoir water storage into three stages, the landslide deformation characteristics and the main factors affecting landslide deformation are qualitatively analyzed . The results show that the rainfall and reservoir water level change are the main factors affecting the displacement of landslide. Rainfall is the main factor affecting the deformation of landslide in the first stage（June 2003 - August 2006） ~ rainfall is the main influence factor and the reservoir water level had a certain influence in the second stage（September 2006- August 2008）~ rainfall and reservoir water level change influence landslide deformation at the third stage （since November 2008）. The research shows that rainfall intensity has a strong correlation with the landslide deformation~ but the influence of reservoir water level is not obvious. The greater the rainfall intensity, the greater the cumulative displacement curve increased.