Abstract:In segment of K90+900–K910+080 at Xiangtan—Shaoyang Expressway,there are two sub-first grade faults which intersect obliquely with roadbed. A plentiful intersectant joints which are about vertical,along-slope clay shale,and bad coal seams exist in the rock mass in the upper mountain,which are intrinsic factors that induce landslide. The maximum depth of cutting slope is about 30 m. After the cutting slope is excavated,the shear resistance of soft rock seam falls because the surface water infiltrates through the top rock joints into it,and therefore,landslides take place probably. Simplified Bishop method is adopted in landslide calculation. The shear strength parameters of slide seam are drawn out that the internal friction angle j =11.5° and the cohesion c= 8.2 kPa by back analysis and experience analogy. If the rock bolts or anti-slide piles are just adopted without cutting-slope unloading in the treatment,the treatment will be very expensive. Therefore,the main measures adopted for cutting-slope unloading are put forward in the first landslide treatment scheme. In construction,top cracks are not blocked and drainage system is not set up in time,the shear resistance of slide seam constantly falls because the water in the slide seam is not easily drained away;and lead the slope to slide constantly. Based on further calculation and analysis,long rock bolts and other waterproof drainage facilities are presented in additional treatment scheme. The landslide has kept stabilization for three years since the treatment measures were taken.