基于应力监测的煤层水力造穴效果检验技术研究

针对薛湖煤矿煤层瓦斯含量高、透气性低，存在瓦斯抽采工程量大、抽采时间长、钻孔抽采效果差、回采接续紧张等难题，通过布置应力监测仪，监测并分析薛湖煤矿25040机巷高瓦斯低渗透煤层水力造穴过程煤层应力演化规律，研究确定顺层线造穴有效影响半径及卸压增透范围。研究结果表明：顺层线造穴期间，距离钻孔越近，煤层应力变化越明显，距离钻孔越远，煤层应力越稳定|线造穴后，钻孔周围不同煤体的应力变化在时间和空间上均不同，距离钻孔越近，煤层应力变化越早，变化趋势越单一，变化幅度越大|距离钻孔越远，煤层应力变化越滞后，变化趋势越复杂，变化幅度越小|根据煤体应力变化可知，顺层线造穴有效影响半径为24m。研究结果对薛湖煤矿顺层线造穴安全高效的实施具有重要的指导作用。

Testing Technology of Hydraulic Caving Effect in Coal Seam Based on Stress

In order to eliminate the outburst risk of high gas and low permeability coal seam, the stress field monitoring technology is used to monitor and test the effect of coal seam hydraulic cave building, and the stress evolution law of coal seam before and after hydraulic cave building is analyzed. The research results show that the stress changes of coal seam around the borehole are different in space. The closer the borehole is to the borehole, the more obvious the stress changes of coal seam are; after the completion of the construction of the borehole, the earlier the stress changes of the position near the borehole, the more single the change trend, the greater the pressure relief amplitude; the farther the borehole is to the borehole, the later the stress changes, and the more complex the change trend compared with the results of gas pressure measurement, the monitoring results of stress field can fully reflect the implementation effect and influence range of hydraulic hole making.