摘要
为研究眼前山铁矿露天转地下首采分段区域冒落冲击风险,应用应力监测、微震监测、数值分析方法获得了首采分段围岩的开采扰动响应特征,提出了眼前山铁矿冒落冲击风险评价方法.研究结果表明:随着与采场距离的减小,岩体的应力变化量、累计微震事件数逐渐上升,当前的回采活动引起岩体内应力集中区及破裂区的局部贯通;利用应力集中程度、应力集中区范围、应力集中区贯通程度、岩体断裂路径贯通程度4 个指标综合量化眼前山铁矿地下首采分段区域冒落冲击风险为低等级.
Abstract
This paper focuses on a study in response to the risk of falling impact in the first mining section area fromYanqianshan opencut coal mine to underground mine.The study involves using stress monitoring,microseismic monitoring,and numerical analysis methods to obtain the mining disturbance response characteristics behind the surrounding rock in the first mining section,and proposes a method for evaluating the risk of falling impact in Yanqianshan iron mine.The research results show that,with the distance shortened from the mining site,the rock changing number of the stress values and the accu-mulated number of the microseismic events increase gradually,and the current mining work causes a local penetration through the stress concentration areas and fracture areas within the rock mass.By using four indicators including the stress concentration degree,the range of stress concentration area,the penetra-tion degree of the stress concentration area,and the connection degree of rock fracture path,the study quantifies the risk of falling impact in the first underground mining section area of Yanqianshan as a low level.
国家科技期刊平台
NSTL
万方数据