特厚煤层中掘进巷道过联络巷期间巷道围岩活动规律研究
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摘要
针对陕西某矿掘进巷道过联络巷期间发生的矿压异常现象,基于现场异常矿压观测情况,利用FLAC3D有限差分软件对特厚煤层中掘进巷道穿联络巷过程中不同时期巷道围岩应力分布演化特征进行了数值计算分析,并结合SOS微震监测结果对巷道围岩微震活动过程进行了研究。结果表明,在特厚煤层中掘进巷道穿联络巷过程中穿联络巷的巷道围岩冲击危险性呈现"升高—降低—升高—降低"的演化规律,并据此将巷道围岩应力分布演化过程近似划分为5个具有不同应力特点的阶段。
In view of the abnormal rock pressures during extraction roadway going across connecting slot in a coal mine in Shaanxi province,and based on observation conditions of the field rock pressure,the distribution and evolutionary characteristics of stresses in roadway surrounding rocks in different periods during extraction roadway going across connecting slot in extremely thick coal seam were analyzed and calculated by finite difference software FLAC 3D,and microseism activities were studied by combining with the monitoring results of SOS microseism system.The results showed that the risk of rock burst in roadway surrounding rocks was characterized by an up-down-up-down evolution law during extraction roadway going across connecting slot in extremely thick coal seam,and according to the characteristics,the distribution and evolutionary process of stresses in roadway surrounding rocks could be divided into 5 stages which had different stresses characteristics.
In view of the abnormal rock pressures during extraction roadway going across connecting slot in a coal mine in Shaanxi province,and based on observation conditions of the field rock pressure,the distribution and evolutionary characteristics of stresses in roadway surrounding rocks in different periods during extraction roadway going across connecting slot in extremely thick coal seam were analyzed and calculated by finite difference software FLAC 3D,and microseism activities were studied by combining with the monitoring results of SOS microseism system.The results showed that the risk of rock burst in roadway surrounding rocks was characterized by an up-down-up-down evolution law during extraction roadway going across connecting slot in extremely thick coal seam,and according to the characteristics,the distribution and evolutionary process of stresses in roadway surrounding rocks could be divided into 5 stages which had different stresses characteristics.
引文
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[3]夏永学.不同冲击启动类型的地音前兆信息识别[J].中国煤炭,2015(3)
[4]康红普.软岩巷道和硐室的底鼓机理及卸压技术的研究[D].徐州:中国矿业大学,1991
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