开采上保护层下伏煤岩应力效应演化规律  

Stress Effect Evolution Law of Underlying Coal and Rock Seam During Upper Protective Layer Mining

作　　者：吴家浩[1] 王兆丰[1] 王立国[1] 曹超[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《煤矿安全》2015年第10期40-43,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51274090)

摘　　要：为研究青龙煤矿上保护层开采过程中下伏煤岩层的应力效应演化规律,评价保护层开采效果,利用数值模拟的方法,研究了被保护层最大主应力沿走向分布状态,并对被保护层变形特性和瓦斯流量进行了现场考察,分析了保护层开采过程中被保护层的卸压规律。结果表明:上保护层开采过程中,被保护层最大主应力沿走向呈现"四带"分布特征,卸压带内应力最大释放率为43%;煤层相对膨胀变形率最高达到4.9‰;钻孔瓦斯流量最高为0.194 m3/min,提高28倍。煤层变形特性及瓦斯流动规律与数值模拟结果基本一致,卸压区域更加有利于瓦斯排放,合理布置钻孔可有效提高抽采效果。In order to research evolution law of the below coal and seam stress effect and estimate the effect of protective layer mining on Qinglong Coal Mine,the maximum principal stress distribution was studied by numerical simulation,and the deformation characters and gas flow of the protected layer were inspected on the spot,the pressure relief laws of protected layer during protective layer mining was analyzed. The results show that the maximum principal stress in advancing direction are in the terms of four- zone,the maximum release rate of stress is 43% in pressure relief zone,the relative expanding deformation rate increase to 4. 9‰,gas flow increase to0. 194 m3/ min with 28 folds,the regularity of deformation and gas flow correspond with the result of numerical simulation. The effect of gas extraction would be improved by perforating reasonable perforating arrangement because gas emission is easier in the pressure- relief zone.

关 键 词：数值模拟 上保护层开采 卸压范围 膨胀变形 瓦斯流量 瓦斯抽采 

分 类 号：TD32[矿业工程—矿井建设]