FAILURE MECHANISM AND STABILITY OF A TYPE OF PLATE SLOPE

This paper presents a detailed investigation and analysis anatomy for the Lutingxi No. W24 typical slope. The paper compares this slope with other slopes available in the literature and puts forward a type of failure mode of plate slope. The paper confirms that this type slope can occur in the nearly horizontal sandstone intercalated with shale strata, in the upper mainly horizontal hard-harder limestone strata, and in the lower mainly horizontal soft sand mudstone rock strata. This papers analyzes the formation mechanism of this type slope from the perspective of geological evolution. The progress can be divided into three phases: ① Unload rebound phase; ② Extended phase of pressing-crack Surface from bottom to up; ③ the Phase of sliding surface though. The paper briefly analyzes the factors of affecting the stability of slope, and focuses on analysis of the effects of groundwater conditions for the stability of such type slopes. Based on limit equilibrium theory, the paper uses different methods to calculate the starting head water of such slopes, and analyzes the stability of such slopes under rainfall conditions. According to the typical slope of No. W24,the paper loads the starting water head to simulate the whole process of such type slopes form accumulating deformation to the overall instability by discrete element numerical simulation technology. At last, through the study of failure mechanism and stability of such type slopes, the paper proposes targeted measures for such type slopes.