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《Geological Science and Technology Information》 2012-02
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Effect of Sliding Bed Permeability on the Stability of the Overlap Researvoir Old Landslide

HE Zhong-ze1,ZENG Yao2,3,Lü Kun2,WU Jiang2,4,YAN E-chuan2(1.Hubei Central South Exploration & Foundation Engineering Co.Ltd,Wuhan 430081,China; 2.Faculty of Engineering,China University of Geosciences,Wuhan 430074,China; 3.Guizhou Transportation Planning Survey & Design Academe,Guiyang 550001,China; 4.Geological Environmental Monitoring Stations of Wanzhou,Wanzhou Chongqing 404000,China)  
The overlap reservoir old landslide develops mostly on sand and gravel layer at the advancing edge.The strong permeability of the layer will affect the flow field and the stability of the landslide.In this paper,the Wanzhou Middle School landslide was taken as an example.The groundwater model of the landslide was determined the confined aquifer model.On the assumption of the four different permeability coefficient of the sand and gravel layer,we studied the effect of the permeability on the stability of old landslide under the condition of the reservoir water fluctuation.The results show that the phreatic surface of the landslide is different with the different permeability of sand and gravel layer.If the permeability coefficient is smaller,the surface is lower in the landslide,and the lagging effect of groundwater on reservoir level is more obvious.In the time of reservoir water rising,high level and early decline,the factor of safety of the landslides,old and secondary and tertiary landslide,are decreasing with the increasing of the permeability coefficient.When the water level is 150 m,the stability of the old landslide is increasing with the increasing of the permeability coefficient,and the change of the stability of the secondary and tertiary landslide is not obvious.It is of great applicable value to the improvement of old landslide monitoring and prediction.
【Fund】: 国家自然科学基金项目(40672189);; 中南冶金地质勘查局项目(冶金地质鄂2008-143)
【CateGory Index】: P642.22
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