刀柱式老采空区上行长壁开采的采矿安全评价  

Safety Assessment of Ascending Longwall Mining over Old Rib Pillar Gobs

作　　者：王明立[1] 张华兴[1] 张刚艳[1] 

机构地区：[1]天地科技股份有限公司开采所事业部,北京100013

出　　处：《采矿与安全工程学报》2008年第1期87-90,共4页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2005CB221503)

摘　　要：为保证刀柱式老采空区上行长壁开采安全,需要对层间岩体在采动压力作用下的稳定性进行评价,并合理确定长壁工作面的开采技术参数.基于对层间岩体在采动过程中的受力分析,综合考虑层间岩体的黏聚力、摩擦阻力、采动压力、岩体自重、刀柱残余承载力等因素的作用,提出了评价层间岩体稳定性的安全系数法.如果安全系数大于1,则可以认为在上行开采过程中层间岩体能够保持稳定.采用数值模拟方法研究了上行长壁工作面不同开采参数对层间岩体稳定性的影响.结果表明,长壁工作面宽度、护巷煤柱宽度对层间岩体稳定性影响明显.在刀柱式老采空区进行上行长壁开采,应减小工作面开采宽度,增大工作面护巷煤柱尺寸.In order to ensure the safety of long-wall mining over an old rib pillar mining area, the stability of interlayer rock body under the action of mining-induced pressure needs to be evaluated and rational technical parameters for the long-wall mining determined. Based on the stress analysis of the interlayer rock bodies under mining induced pressure, we proposed the safety coefficient method to evaluate the stability of interlayer rock bodies. In this method, factors such as cohesion, friction, and gravity of interlayer rock bodies, rib pillar residual bearing capacity and mining induced pressure are considered. If the safety coefficient is greater than 1, then the interlayer rock body is thought to be stable during the ascending mining process. The numerical simulation with FLAC was used to study the effect of longwall mining parameters on the stability of interlayer rock body. The simulation results indicate that the longwall face width and the barrier pillar width obviously affect the stability of interlayer rock body. When the ascending longwall mining is used in old rib pillar gobs, the longwall face width should be reduced and the barrier pillar size should be increased.

关 键 词：上行开采 安全系数 层间岩体 刀柱 

分 类 号：TD325.3[矿业工程—矿井建设]