SUN L, DU X X, MA H F,et al.Simulation study on the stability of open-pit mine slopes under blasting impact[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(6):101-109.

doi:10.16186/j.cnki.1673-9787.2023090032

Received: 2023/09/14

Revised: 2024/05/09

Published: 2025/10/14

Simulation study on the stability of open-pit mine slopes under blasting impact

Sun Lei1, Du Xiaoxue2, Ma Hongfa3, Liu Chuanpeng2, Yang Juntao2

1.Guoneng Beidian Shengli Energy Co.， Ltd.， Xilinhot  026000， Inner Mongolia， China；2.School of Mechanics and Civil Engineering， China University of Mining and Technology， Beijing  100083， China；3.College of Energy and Mining Engineering， Shandong University of Science and Technology， Shandong  266590， Qingdao， China

Abstract: Objectives To investigate the dynamic response and stability evolution of slopes under blasting impact.  Methods Field blasting monitoring tests were conducted on the slope of an open-pit mine in eastern Inner Mongolia. A numerical slope model was established using ANSYS/LS-DYNA to simulate and analyze the dynamic response of slope particles. The effective stress， vibration velocity， and displacement characteristics of the slope rock mass were examined. The safety factor of the slope under blasting impact was derived using the limit equilibrium method and quasi-static method. Results Under blasting， the peak stresses at monitoring points 1–4 were 1.09， 0.55， 0.23， and 0.15 MPa， with effective stress durations of 8， 5， 4， and 3 ms. The peak vibration velocities in the X-direction were 9.98， 3.88， 1.99， and 0.95 cm/s， and the residual deformations of the rock mass units were 0.001 80， 0.000 90， 0.000 55， and 0.000 40 cm. Conclusions The results indicate that the effective stress induced by blasting propagates into the rock mass， with its peak value decreasing over time and distance. As the distance from the blast center increases， the peak vibration velocity of slope particles decreases， and residual deformations in the plastic zone gradually diminish. The calculated safety factors  under static conditions （1.35） and blasting conditions （1.05） both meet the specification requirements， indicating that the open-pit slope remains stable. These findings provide a reference for blasting construction in the open-pit mines.

Key words: blasting vibration; numerical simulation; open-pit slope; dynamic response; slope stability