This paper summarizes the landform and engineering geologic conditions of the left dam abutment of Yonghe Reservoir of Qingyuan County, Shanxi Province, analyzes the stratum structure and distributional characteristics of the sliding body and collapse clinosol, and analyzes the geneses of the sliding body and collapse clinosol.

Treatment of bedding plane landslide of face-upward slope at exit of tunnel;

Combining with concrete project,it analyzes the situation and causes of the water-rich losses tunnel collapsing part,introduces treatment scheme and measures of this Tujiawan tunnel collapsing part,emphatically discusses the collapsing part construction excavation and lining,and accumulates treatment experiences of the water-rich losses collapsing part.