地下水位变动对永善县城东部滑坡稳定性的影响研究

Study on the Influence of Groundwater Level Changes on the Stability of Landslides in the East of Yongshan County

以云南省永善县城东部古滑坡为研究对象,基于野外勘察资料、地表水及地下水观测资料、水质分析试验结果并结合该滑坡的发育特征,采用GeoStudio数值模拟地下水位变动,对该滑坡稳定性进行分析。结果表明,除降雨外,生活污水下渗为地下水位上升的主要因素,地下水位抬高,致使滑坡稳定性降低;滑块稳定性系数与地下水位变幅呈负相关;地下水潜蚀作用,引发碎石、块石压密变形,加大地面建筑物的变形,促使滑块复活。

Taking the Paleolandslide in the east of Yongshan County of Yunnan Province as the research object,the GeoStudio is used to numerically simulate the change of groundwater level and analyze the stability of landslide based on the field survey data,surface water and groundwater observation data,water quality analysis test results and the development characteristics of landslide.The results show that,(a)in addition to rainfall,the infiltration of domestic sewage is the main factor for the rise of groundwater level,and the rise of groundwater level reduces the stability of the landslide;(b)the stability coefficient of slide is negatively correlated with the variation of groundwater level;and(c)the subduction effect of groundwater triggers the compression and dense deformation of debris and blocks,increases the deformation of ground buildings,and promotes the resurrection of the slide.