摘要
华兴能源有限责任公司唐家会煤矿首采F61101工作面埋深超过500m,邻近矿井综放采场顶板周期来压期间出现支架安全阀频繁开启现象。为了保证类似条件下工作面安全高效开采,以唐家会煤矿F61101工作面为研究对象,对采场围岩应力演化规律、覆岩结构特征及矿压显现规律进行分析。针对特厚煤层综放采场开采条件,综合数值模拟、理论分析及现场工程实践,研究了综放采场围岩应力演化规律、覆岩结构特征、矿压显现规律等。结果表明:综放采场初次来压及周期来压步距分别为37.6m、9.9m,现场实测超前应力集中系数为1.8,采场超前应力集中区在工作面前方7~10.5m;采用应力拱理论分析了采场矿压总体上呈现动压小、静压大的原因,并计算了拱高及支架承受的理论静载荷,计算结果与现场实测相符。
The first mining F61101 working face of Tangjiahui Coal Mine is over 500 m deep underground,and in adjacent fully mechanized top coal caving stope,the safety valves of the supports open frequently during roof weighting.In order to ensure safe and efficient mining under similar conditions,the F61101 working face of Tangjiahui Coal Mine was taken as the research object to analyze the stress evolution law of the surrounding rocks of the stope,the structural characteristics of the overlying rock,and the behavior of rock pressure,combining with the mining conditions of fully mechanized top coal caving stope in extra-thick seam,by means of numerical simulation,theoretical analysis and field engineering practice.The results show that the intervals of initial roof weighting and periodic weighting are 37.6 m and 9.9 m,respectively,and the field-measured advance stress concentration factor is 1.8,the advance stress concentration area of stope is about 7 ~ 10.5 m in front of the working face.Reasons for the small dynamic pressure and large static pressure are analyzed using tress arch theory.The theoretical static loads of arch height and support are calculated,which agrees with the field measurements.
作者
任启寒
徐遵玉
陈成
REN Qi-han;XU Zun-yu;CHEN Cheng(State Key Laboratory of Gas Disaster Monitoring and Emergency Technology,Chongqing 400037,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China;Ordos Huaxing Energy Co.,Ltd.,Ordos 010321,China)
出处
《煤炭工程》
北大核心
2021年第1期79-83,共5页
Coal Engineering
关键词
特厚煤层
综放开采
弱粘结顶板
矿压显现
覆岩垮落
extra-thick coal seam
fully-mechanized top coal caving
weak cohesive roof
rock pressure behavior
overburden rock collapse
