长江三峡库区滑坡变形统计特征研究

三峡库区受到蓄水影响的滑坡众多,其对库区人民生命财产构成严重威胁。该文通过统计得出,从2003年6月10日蓄水以来,2 619个涉水滑坡中有674个出现变形或失稳。经过分析得出:(1)三峡库区滑坡75.5%的变形发生在分阶段蓄水周期内,54.3%的变形发生在三个初次升降周期内;在分阶段蓄水期内64.1%滑坡变形发生在库水上升及稳定阶段;在正常运营周期内,75.7%滑坡变形发生在库水下降及稳定阶段。(2)滑坡变形与库水位变动过程具有明显的相关性,但在库水循环变动作用下滑坡变形数量及变形程度呈现逐年减少变缓的趋势。(3)滑坡变形动态因素为库水位升降与降雨,内在因素主要受斜坡结构、滑面形态、涉水程度、渗透特性的影响。

Research of Statistical Characteristics of Deformation of Landslides in the Three Gorges Reservoir Area of the Yangtze River

The massive landslide in the three gorges reservoir area is affected by water storage,which poses a serious threat to the life and property of the people in the reservoir area.According to the statistics,674 of the 2619 wading landslides have been deformed or destabilized since the water impoundment on June 10,2003.After analysis,it is concluded that:①the deformation of 75.5%of the landslide in the three gorges reservoir area occurred during the phased storage period,and 54.3%of the deformation occurred during the three initial lifting cycles;During the stage-storage period,64.1%of the landslide deformation occurred during the upsurge and stabilization phase of the reservoir.During the normal operation period,75.7%of the landslide deformation occurred during the decline and stabilization of the reservoir.②there is an obvious correlation between the landslide deformation and the change of the reservoir water level,but the number and degree of deformation of landslide deformation under the change of reservoir circulation are decreasing year by year.③the dynamic factors of landslide deformation are the water level fluctuation and rainfall,and the internal factors are mainly affected by slope structure,sliding surface morphology,wading degree and permeability characteristics.