深井厚煤层综放工作面顶板运动与沿空巷道围岩变形动态响应关系  

Dynamic response relationship between roof movement and deformation of roadway in fully mechanized caving face of deep and thick coal seam

作　　者：卜滕滕 BU Tengteng(CCTEG Changzhou Research Institute,Changzhou 213015,China;Tiandi(Changzhou)Automation Co.,Ltd.,Changzhou 213015,China)

机构地区：[1]中煤科工集团常州研究院有限公司,江苏常州213015 [2]天地(常州)自动化股份有限公司,江苏常州213015

出　　处：《采矿与岩层控制工程学报》2021年第2期46-54,共9页Journal of Mining and Strata Control Engineering

摘　　要：针对深井厚煤层综放工作面沿空巷道围岩控制困难的问题,以新河煤矿5302工作面沿空巷道为研究对象,采用理论分析、现场实测、微震监测等手段研究了巷道变形和顶板运动的动态响应关系,重构了工作面顶板破断过程,分析了回采巷道变形特征,建立了回采巷道受力模型,确立了顶板破断与巷道变形的对应关系,得出以下主要结论:5302工作面顶板破断过程存在"大小周期"现象,顶板最大破断高度为70 m,高位岩层(中位基本顶和高位基本顶)的破断是沿空巷道变形加剧的主要原因;在顶板初次破断周期内,巷道围岩变形随着顶板破断高度的增加而持续增加,在周期破断过程中,巷道围岩变形不会持续增加,而是在一个范围内周期性地上下波动;高位岩层破断致使两帮移近量和顶板下沉量达到峰值,但两帮和顶板变形峰值响应的时机不同,两帮移近量峰值显现滞后于高位岩层破断位置,顶板下沉量峰值显现超前于高位岩层破断位置。研究揭示了深井厚煤层沿空巷道围岩变形与顶板岩层运动间的对应关系,可为其围岩控制设计提供参考。Ground control of the surrounding rock of the roadway along the gob in the fully mechanized caving face in deep mine thick coal seams is challenging.A combined method of theoretical analysis,field measurement,microseismic monitoring have been used to study roadway deformation and roof movement of an entry driven along the gob of the 5302 longwall panen in Xinhe coal mine.The dynamic response relationship of the working face and the roof breaking process of the working face have been reconstructed.The deformation characteristics of the mining roadway have been analyzed.The force model of the working roadway and the corresponding relationship between the roof breaking and the roadway deformation have been established.The following conclusions are drawn.There is a phenomenon of’’large and small periods’’in the breaking process.The maximum breaking height of the roof is 70 m.The breaking of high-level rock formations(the middle basic roof and the high basic roof)is the main reason for the increased deformation of the roadway along the gob.During the initial breaking cycle of the roof,the roadway deformation continues to increase with the increase of the roof breaking height.During the periodic breaking process,the roadway surrounding rock deformation will not continue to increase,but periodically fluctuate up and down within a range.The breaking of the high-level rock strata causes the two sides to move closer together.The roof subsidence reaches the peak value,but the timing of the peak deformation of the two slabs and the roof deformation is different.The peak approach of the two slabs lags behind the fracture position of the high-level rock formation,and the peak roof subsidence appears to be ahead of the fracture position of the high-level rock formation.The study revealed the corresponding relationship between the deformation of the surrounding rock along the entry and the movement of the roof rock in the thick coal seam of the deep mine,which can provide a reference for its surrounding rock control desi

关 键 词：深部综放工作面 沿空巷道 顶板运动 巷道变形 动态响应关系 

分 类 号：TD322[矿业工程—矿井建设]