Journal of Yangtze River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (5): 82-87.DOI: 10.11988/ckyyb.20200335

• ROCK-SOIL ENGINEERING • Previous Articles     Next Articles

Study of Particle Peak Velocity of Critical Damage Based on Slope Stability

LIANG Rui, BAO Juan, ZHOU Wen-hai   

  1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2020-04-19 Revised:2020-07-17 Online:2021-05-01 Published:2021-05-17

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 (vPP), and dynamic tensile strength of rock during the blasting of rock mass on the potential sliding surface. In line with the classical vPP criterion, the vPP criterion of maximum tensile stress, and the statistical relation between peak tensile stress and vPP, we acquired three vPP 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 vPP 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 vPP

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