关键词: 岩体损伤特性, 弹塑性本构模型, 有限元强度折减, 岩体爆破, 损伤判据, 质点峰值振动速度, 临界损伤质点峰值速度

Abstract: To study the damage characteristics of blast hole and the adjacent area of potential sliding surface of slope under blasting load, we determined the reduction sliding surfaces of slope under static load by FEM strength reduction method and thus established an elastoplastic constitutive model of slope for numerical simulation. By comparing the numerical simulation results with classical criteria, we determined the blast center distance and rock fragmentation status corresponding to different damage velocity thresholds, and further investigated the relations between damage, blast center distance, peak particle velocity (v_PP), and dynamic tensile strength of rock during the blasting of rock mass on the potential sliding surface. In line with the classical v_PP criterion, the v_PP criterion of maximum tensile stress, and the statistical relation between peak tensile stress and v_PP, we acquired three v_PP thresholds and found that the error obtained by the criterion of maximum tensile stress was the largest. The research findings can be used to modify existing v_PP criteria based on the maximum tensile stress criterion in actual engineering.

Key words: damage characteristics, elastoplastic constitutive model, FEM strength reduction, rock mass blasting, damage criterion, particle peak velocity, critical damage v_PP