Effects of blasting disturbance on deterioration of stability of sliding dangerous rock mass

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (11) : 70-79.

SHOCK AND EXPLOSION

Effects of blasting disturbance on deterioration of stability of sliding dangerous rock mass

WEI Junhao1, DENG Zhengding*1, LIU Hao2, LIU Shunyuan1

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Abstract

The stability of slip-type dangerous rock masses critically depends on the effective utilization of shear strength by the rock bridge section; however, the rock bridge is frequently subjected to adjacent blasting disturbances, which can lead to the deterioration of its shear properties and, consequently, reduce the stability of the dangerous rock mass. Firstly, considering the influence of blasting stress waves on the cohesion of the rock bridge section after its bond strength has deteriorated and decayed, a stability evaluation model for dangerous rock masses under blasting disturbance is established based on the limit equilibrium theory; Secondly, the rock mass damage is regarded as the weakening of the area of intact rock, and the Maxwell model is improved to establish a cohesion deterioration model for the rock bridge section under blasting disturbance, which is subsequently verified for its reasonableness through experimental validation; Finally, the stability evaluation model is applied to engineering examples of dangerous rock masses, and sensitivity analyses of relevant parameters are conducted using these cases. The research findings indicate that the larger the elastic modulus and initial porosity of the rock, the faster the rate of cohesion damage to the rock bridge section of the dangerous rock mass. The vertical and tangential loads generated by blasting significantly affect the stability of dangerous rock masses, and when the angle between the direction of blasting stress wave propagation and the structural plane exceeds 90°, the tangential stress on the structural plane has a positive effect on the stability of the dangerous rock mass. The rate of deterioration of stability for dangerous rock masses increases with decreasing blasting distance, and the impact load generated by blasting has a more significant impact on the stability of dangerous rock masses than does the cohesion deterioration. This evaluation model provides a theoretical basis for the scientific disaster prevention and reduction work in the vicinity of dangerous rock masses that are frequently subjected to blasting excavation.

Key words

Dangerous rock mass / Blasting disturbance / Limit equilibrium / Cumulative damage / Cohesion

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WEI Junhao1, DENG Zhengding1, LIU Hao2, LIU Shunyuan1. Effects of blasting disturbance on deterioration of stability of sliding dangerous rock mass[J]. Journal of Vibration and Shock, 2025, 44(11): 70-79

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