Zhu Quedong Landslide Failure Model

Abstract

The max level sliding distance of Zhu Quedong landslide is 80m; its vertical sliding distance is 50.0m. An the sliding axle, the sliding mass length is about 450.0m, which perpendicular to Changde-Jishou expressway; the leading edge width at hillside foot is about 500m and the sliding mass width along Changde-Jishou expressway is about 430.0m. Its volume is about 2.6×106m3. The direct economic loss is about 3.192×107RMB. According to geology investigation, the geological structures control the landslide: fault F1and fault F2 control the boundary of landslide, the stratum attitude controls the slip direction. Rainfall and river erosion are the major factors to cause the landslide. Multiple sliding formed Zhu Quedong landslide outline and there is different failure model in different area. In I-1 sub region, the failure model is creeping-tensile for slope foot loses support caused by river erosion; in I-2 sub region, the failure model is slip-buckling-tensile caused by the lateral drag force of I-1 sub region slipping, in I-3 sub region, the failure model is slip-tensile with rotation-slide for its foot loses support caused by I-1 sub region and I-2 sub region slipping and uneven stacking load cause by subgrade construction, in I-4 sub region, the failure model is slip-tensile. In II area, the slope failure model is shear deformation by lateral forces of I area slipping. In III area, the slope failure model is slip-tensile because the slope foot loses support caused by I area sliding.