Optimization and stability research of span parameters for thick orebody mining sites

doi:10.16265/j.cnki.issn1003-3033.2025.11.0167

Abstract

Abstract:

To balance stope stability with mining economy and to inform stope span design in similar engineering projects, a comprehensive investigation was conducted on the stope span and its stability, using the -200 m level of a copper mine as a case study. The Mathews stability chart method was adopted to evaluate the stope stability by calculating the rock mass stability index and hydraulic radius, thereby defining a reasonable range of stable stope spans. Based on the analysis, four stope span scenarios were designed and numerically simulated using finite difference software to study the stope responses. Comparative analyses were performed on roof displacements and the characteristics of plastic zones in the surrounding rock. The results show that as the stope span increases from 12 m to 18 m, vertical displacement of the roof increases gradually, and the volume of the plastic zone fluctuates slightly. However, when the span reaches 20 m, a significant increase in roof displacement and a sudden expansion of the plastic zone which leads to through-going failure is observed, severely compromising roof stability. An optimal stope span of 18 m is recommended for the -200 m level of the copper mine. The stope span design of mining should consider the influence of factors such as orebody occurrence conditions, safety and efficiency.

Key words: thick orebody, stope span, graphical method, numerical simulation, stope stability

CLC Number:

X936

CHENG Zhuzhe. Optimization and stability research of span parameters for thick orebody mining sites[J]. China Safety Science Journal, 2025, 35(11): 107-113.

Figures/Tables 8

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岩体名称	密度/ (g·cm^-3)	抗压强度/ MPa	抗拉强度/ MPa	弹性模量/ GPa	黏聚力/ MPa	内摩擦角/ (°)	泊松比
围岩	2.84	42.3	10.2	20	4.2	20	0.22
矿体	3.42	57.74	15.26	30	6.5	35	0.24