Abstract: Because of the progressive damage of slope slip, it is significant to study the local safety degree of the slope. In this paper an improved method on calculating the local zone safety index (ZSI) is established to describe the stability state of local rock and soil mass at different stages of elastic, plastic and damage. studied the safety degree space distribution of slope by dynamic time-history numerical simulation. Based on the numerical tests of the centrifuge loading on the static slope, the rationality of the improved local zone safety index is verified. The time-history dynamic numerical simulation of the slope affected by blasting is carried out, and the distribution modes of local safety index of slope under different blasting parameters are obtained. The results show that with the increase of blasting load, pore water pressure and blasting action time, the negative area of ZSI at the slope also increases and the sliding surface is extending. The velocity increase zone is located at the sliding body, the damage zones are mainly located at the regions affected by blasting activity and sliding zones. The slope sliding surface is obviously affected by pore water pressure under the blasting action. The blasting action time obviously affects the damage zone near explosion source. The method and conclusions from this paper is meaning for understanding the mechanism of slope progressive destroy with blasting effects.

Key words: slope, local safety, progressive destroy, vibration velocity, blasting load