新街矿区深部开采大能量矿震规律与发生机理研究

Study on Seismic Regularity and Mechanism of Deep Mining Large Energy Mine in Xinjie Mining Area

新街矿区所属煤矿在开采过程中,多次发生大能量矿震事件,严重制约了矿井的安全生产。为有效监测和防治矿井冲击地压事故,以新街矿区红庆河煤矿105采煤工作面“4·2”大能量矿震事件为研究背景,采用综合指数法评价工作面的冲击危险性,分析工作面多次出现大能量矿震的主要原因。研究表明:105工作面回采期间的冲击地压危险等级为中等冲击危险;105采煤工作面上方高位173~248m范围内的厚层砂岩是3-1煤层附近发生矿震的主要因素,当该区域高位厚层砂岩层达到承载极限时,随即发生破断造成大能量矿震的发生;103工作面辅运顺槽65m区段煤柱导致的上覆顶板垮冒不充分、105工作面相对于103工作面的外错布置导致的顶板不规则垮冒,以及105工作面与相邻的103工作面间的双工作面见方效应,都是新街矿区红庆河煤矿105工作面大能量矿震的主要影响因素。

In the process of mining the coal mine of Xinjie Mining area,the occurrence of large energy mine seismic events has seriously restricted the safe production of the mine.In order to effectively monitor and prevent mine rock burst accidents,using the 105 coal face in the Xinjie mining area as the focus of the study,the comprehensive index method has used to evaluate the impact risk of the working face,and the main reasons for the repeated occurrence of large energy mine earthquakes in the working face are analyzed.The results show that:the rock burst danger grade during the mining of 105 face is medium shock danger;The interlayer of thick sandstone in the upper 173~248m range above the coal face of 105 mining face is the main factor for the occurrence of mine earthquake near the 3-1 coal seam.When the upper thick sandstone layer in this area reaches the bearing limit,large energy mine earthquake occurs due to random fracture;Insufficient overlying roof caving caused by coal pillar in the 65m section of auxiliary running trough of the working face 103,irregular roof caving caused by the external misplacement of the working face 105 to the working face 103,and the square effect of the double working face between the working face 105 and the adjacent working face 103 are also the main influencing factors of the high energy mine earthquake at the working face 105 of a mine in Xinjie.