摘要
采矿过程中,岩体往往具有显著的时变特征,而常规静态分析中往往忽略了这一特征,难以很好地表现采矿过程中力学特性的时空状态变化情况。以某缓倾斜薄层状矿体为研究对象,通过数值模拟对矿体开采过程进行时变分析和常规静力分析。结果显示:常规分析时,岩体应力及位移均表现为减速增长,采场稳定性较好;而时变分析时,岩体位移较常规分析更大,岩体稳定性较差,安全回采距离由30 m减小为14 m;对比可以发现蠕变对岩体稳定性有显著影响。
The rock mass has a significant time-varying feature in the process of mining,which is ig⁃nored in the conventional static analysis.The temporal and spatial state changes of mechanical properties can’t be expressed.Taking the gently inclined thin mine as the research object,the numerical simulation software is used to analyze the continuous mining process of the mine in terms of the time-varying analysis and the conventional static mechanical analysis.The simulation results show that the rock stress and dis⁃placement see a slow growth and the stability of the stope is well in the conventional static mechanical anal⁃ysis.In the time-varying analysis,the displacement is larger and the stability of rock mass is poor.The safety distance of continuous mining process is reduced from 30 m to 14 m.It can be found that creep has a significant effect on the stability of rock mass.
作者
代光俊
余梦豪
李雪峰
郭威
裴明松
DAI Guangjun;YU Menghao;LI Xuefeng;GUO Wei;PEI Mingsong(Central South Institute of Metallurgical Geology;School of Resources and Environmental Engineering,Wuhan University of Technology)
出处
《现代矿业》
CAS
2021年第8期63-67,119,共6页
Modern Mining
基金
湖北省自然科学基金项目(编号:2019CFB751,2016CFB637)。
关键词
蠕变
层状岩体
数值模拟
安全回采距离
creep
layered rock mass
numerical simulation
safe mining distance
