沿空侧实体煤内应力与瓦斯分布特征研究  

Study on Internal Stress and Gas Distribution Characteristics of Solid Coal along Side of Goaf

作　　者：付巍 FU Wei(China Coal Technology and Engineering Group Shenyang Research Institute Co.,Ltd.,Shenyang 110000,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,沈阳110000

出　　处：《煤炭技术》2022年第2期97-100,共4页Coal Technology

基　　金：国家科技重大专项资助项目(2016ZX05045-004-001)。

摘　　要：利用ABAQUS数值模拟对煤层开挖后采空侧实体煤内应力变化特征进行了模拟,并在现场留巷内开展瓦斯释放带测试试验,结果表明:煤体受采动影响,应力卸压区和塑性变形区内应力和瓦斯压力得到释放,且煤体吸附的瓦斯被解吸,随着裂隙通道进入采空区,使得实体煤得到卸压消突,形成了瓦斯释放带;模型开挖初期,应力卸压区范围较小,随着工作面的推进,应力集中区逐渐向实体煤侧深部转移,导致瓦斯释放带逐渐增大,但最终会趋于稳定。根据现场试验发现:实体煤侧以深40 m处残余瓦斯含量下降率10.71%~77.88%,在25 m范围内瓦斯下降率均超过了30%,测点内钻屑量最大值为5.2 kg/m,钻屑解吸指标最大值为0.28 mL/(g·min^(0.5)),均符合《防治煤与瓦斯突出规定》。The ABAQUS numerical simulation was used to simulate the internal stress change characteristics of the solid coal on the side of the goaf after the coal seam was excavated,and the gas release zone test was carried out in the on-site roadway.The results showed that the coal body was affected by mining,the stress relief area and the stress and gas pressure in the plastic deformation zone are released,and the gas adsorbed by the coal body is resolved.With the crack channel entering the goaf,the solid coal is relieved of pressure and outburst,forming a gas release zone;at the beginning of the model excavation,the stress the range of the pressure relief zone is small.With the advancement of the working face,the stress concentration zone gradually shifts to the deep part of the solid coal side,causing the gas release zone to gradually increase,but it will eventually stabilize.According to field tests,it is found that the residual gas content reduction rate at a depth of 40 m from the solid coal side is between 10.71%-77.88%,and the gas reduction rate exceeds 30%within the range of 25 m.The maximum amount of drill cuttings in the measuring point is 5.2 kg/m,the maximum value of drill cuttings analysis index is 0.28 mL/(g·min^(0.5)),which are in compliance with the Regulations on Prevention of Coal and Gas Outburst.

关 键 词：卸压区 采空区 残余瓦斯含量 钻屑量 钻屑解吸指标 

分 类 号：TD712[矿业工程—矿井通风与安全]