Stability analysis of a certain open-pit mine's waste dump and simulation of evolution process of induced debris flow

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0019

Abstract

Abstract:

To enhance the stability assessment of the open-pit mine's waste dump slope, a case study was conducted on a waste dump slope in a mining area located in Xizang. Based on a comprehensive analysis of site conditions and engineering geological characteristics, the limit equilibrium method was employed to evaluate slope stability under various loading conditions, including self-weight, rainfall infiltration, and seismic effects. Numerical simulations of debris flow hazards triggered by slope failure were subsequently performed using RAMMS software. Through these simulations, the dynamic evolution process of the induced debris flow was reconstructed, and hazard zoning based on flow intensity was accomplished. The results demonstrate that the waste dump slope remains unstable under the combined loading conditions of self-weight, groundwater seepage, and earthquake, presenting a substantial risk of instability and sliding failure. The RAMMS simulation data further indicate that the debris flow development process consists of three distinct phases: initiation stage, channelized flow stage, and deposition stage. Maximum sediment accumulation depth is recorded at 25.63 m, accompanied by peak flow velocity measurements of 8.73 m/s. The high-hazard zone is quantified to encompass 50.18% of the total affected area, with predominant distribution observed along moderately steep gradients adjacent to the central channel axis.

Key words: open-pit mine, dump, stability analysis, rapid mass movement simulation (RAMMS), debris flow

CLC Number:

X936

XU Hongjian, JIANG Xutong, YU Zhengxing, ZHANG Yihai, CHEN Caixian. Stability analysis of a certain open-pit mine's waste dump and simulation of evolution process of induced debris flow[J]. China Safety Science Journal, 2025, 35(S2): 168-174.

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岩性	黏聚力/kPa	内摩擦角/(°)	重度/(kN·m^-3)	饱和渗透系数/(cm·s^-1)	饱和含水率
中风化糜棱岩	700	39	25.4	1.16×10^-5	0.010 2
堆积体	43.5	36.5	22.5	1.20×10^-2	0.045

工况	类型	许用安全系数
工况Ⅰ	自重+地下水	1.25
工况Ⅱ	自重+地下水+降雨	1.20
工况Ⅲ	自重+地下水+地震	1.20

强度	最大泥深 H/m	关系式	最大泥深与最大流速乘积HV/(m²·s^-1)
高	H≥10	OR	HV≥10
中	5≤H<10	AND	5≤HV<10
低	0≤H<5	AND	HV<5

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