胡家河矿回采巷道变形及超前应力分布规律

Deformation and advanced stress distribution behavior of mining roadway in Hujiahe mine

受综放工作面开采影响,回采巷道的围岩变形破坏规律与超前支承应力影响范围既是巷道支护设计与优化的重要参考,又是矿井冲击地压防治与预测的前提。以彬长矿区胡家河煤矿402102综放工作面泄水巷为工程背景,采用理论分析、数值模拟与现场实测相结合的方法,分析煤层巷道受开采扰动影响造成的围岩变形破坏情况,揭示回采巷道超前支承应力峰值影响范围及超前支承应力影响范围。结果表明:泄水巷超前采动影响范围为工作面前方90 m范围内,且高层位岩层的位移要大于低层位岩层的位移;在一次采动影响阶段,泄水巷顶底板塑性区范围为1.25 m,两帮塑性区范围为1.0 m;泄水巷超前支承应力峰值影响范围实测值10 m,理论值11.4 m,模拟值12 m;泄水巷超前支承应力影响整体范围实测值100 m,理论值103.03 m,模拟值108 m。研究结果验证了理论模型的准确性与数值模拟方法的可靠性,为矿井同等地质条件放顶煤工作面的回采巷道支护优化、冲击地压防治提供重要参考。

Due to the mining of the comprehensive discharge face,the deformation and failure law of the surrounding rock and the influence range of advanced support-stress of the remining roadway are not only an important reference for the design and optimization of roadway support,but also the premise of mine impact pressure prevention and prediction.Taking the drainage alley of the Hujiahe coal mine in Binchang mining area 402102 as a research object,the methods of theoretical analysis,numerical simulation and on-site measurement were adopted to analyze the deformation and damage of surrounding rock caused by the mining disturbance of the coal seam roadway,and reveal the peak influence range of the advanced support-stress as well as the influence range of the advanced support-stress of the mining roadway.The results show that the influence range of the advanced mining of the drainage lane is within 90 m in front of the work,and the displacement of the rock layer in the upper position is greater than that of the rock layer in the lower position.In the first mining influence stage,the plastic zone of the top and bottom plates of the drainage lane was 1.25 m,and the range of the plastic zone of the two sets was 1.0 m.The measured value of the peak influence range of the advanced support stress in the drainage lane was 10 m,the theoretical value was 11.4 m,and the simulated value was 12 m.The measured value of the overall range of the influence of the advanced support stress of the drainage lane was 100 m,the theoretical value was 103.03 m,and the simulated value was 108 m.The results indicate the accuracy of the theoretical model and the reliability of the numerical simulation method,which provides an important reference for the optimization of the mining roadway support and the prevention and control of impact pressure at the topping coal face under the same geological conditions in the mine.