摘要
为兼顾厚矿体采场稳定性和开采经济性,并为同类工程的采场跨度设计提供参考,以某铜矿-200 m中段为工程背景,系统开展采场跨度参数及其稳定性研究。采用Mathews图解法分析采场稳定性,通过计算岩体稳定性指数和水力半径,得出维持采场稳定的采场跨度范围。基于此结果,设计4种不同采场跨度的模拟方案,运用有限差分软件数值模拟研究采场稳定性,对比分析各方案的顶板位移量和围岩塑性区特征。结果表明:当采场跨度从12 m增至18 m时,顶板垂直位移呈缓慢增长趋势,围岩塑性区体积呈波动变化;而采场跨度增至20 m时,顶板垂直位移大幅增加,围岩塑性区体积突增并出现贯通现象,直接威胁顶板稳定性;18 m为该铜矿-200 m中段的最优采场跨度参数;采场跨度设计应考虑矿体赋存条件、安全和效益等因素的影响。
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.
作者
程朱哲
CHENG Zhuzhe(Minmetals Exploration&Development Co.,Ltd.,Beijing 100010,China)
出处
《中国安全科学学报》
北大核心
2025年第11期107-113,共7页
China Safety Science Journal
关键词
厚矿体
采场跨度
图解法
数值模拟
采场稳定性
thick orebody
stope span
graphical method
numerical simulation
stope stability
