煤层注水致工作面前方集中应力前移的机理分析

针对新兴矿煤层注水消除工作面冲击地压和煤与瓦斯突出过程中集中应力前移的问题，分析了注水润湿煤体并使其支撑能力下降而导致集中应力前移的机理；结合新兴矿地质条件，对钻孔注水过程进行了数值模拟，着重分析了注水后集中应力前移、煤壁位移增大和注水钻孔周边渗流场分布情况；数值模拟结果与理论分析结果相一致。另外推导出在注水时间一定时，注水钻孔的渗透半径及应力前移距离公式。

Mechanism Analysis on Concentrated Stress in Front of Mining Face Moving Forward Occurred by Water Injection in Seam

According to the concentrated stress moving forward problem occurred during the process of eliminating the mine pressure bumping and coal and gas outburst danger in the coal mining face with seam water injection in Xinxing Mine,the mechanism of water injection to wet coal body,reduced the seam support capacity,which would cause the stress moving forward was analyzed.In combination with the geological conditions of Xinxing Mine,a numerical simulation was conducted on the borehole water injection process.The concentrated stress moving forward after the water injection,coal wall displacement increasing and the vadose field distribution condition around the water injection borehole were analyzed.The study results of the numerical simulation and the theoretical analysis results were same.A formula for the permeability radius of the water injection borehole and the stress moving forward distance was inferred when the water injection time conducted at the certain time.