重叠煤柱作用下综放采场围岩应力演化规律研究

发布时间：2018-05-12 05:38

本文选题：重叠煤柱 + 双系煤层　；参考：《煤炭科学技术》2017年03期

【摘要】：针对大同矿区石炭系特厚煤层工作面过上覆侏罗系煤柱时的强矿压显现现象,采用数值模拟和现场实测的方法,对上部重叠煤柱与采动耦合作用下的围岩应力演化规律进行研究。采用UDEC数值计算软件,对重叠煤柱作用下工作面的回采过程进行模拟,结果表明:工作面回采至侏罗系煤柱对应区域时,工作面超前支承压力峰值为32~37 MPa,较非煤柱区域提高了25%~33%;工作面的侧向支承压力与上部侏罗系井田边界煤柱应力相互叠加,工作面的侧向支承压力影响范围约为120 m,5105巷道围岩应力达到了27~32 MPa;邻空巷发生冲击性来压是邻近工作面侧向支承压力,本工作面超前支承压力和重叠煤柱应力传递的耦合作用的结果。利用顶板动态监测系统实时监测支架工作阻力,分析得到:工作面推进至侏罗系采空区对应区域,来压期间的支架工作阻力变大,支架增阻更为频繁,矿压显现强烈。
[Abstract]:In view of the phenomenon of strong rock pressure when overlying Jurassic coal pillar in Carboniferous thick coal seam face in Datong mining area, numerical simulation and field measurement are used. The stress evolution law of surrounding rock under the coupling action of superimposed coal pillar and mining movement is studied. The mining process of the working face under the action of superimposed pillars is simulated by using UDEC software. The results show that when the mining face reaches the corresponding area of the Jurassic coal pillar, The peak value of the leading support pressure in the working face is 32 ~ 37 MPa, which is 25 / 33 higher than that in the non-pillar area, and the lateral support pressure of the working face is superposed with the upper Jurassic coal pillar stress at the boundary of the mine field. The influence range of lateral supporting pressure in working face is about 120mLi 5105 roadway, the surrounding rock stress of roadway is 27102MPa, and the impact pressure of adjacent gob roadway is the lateral supporting pressure of adjacent face. The coupling effect between the leading supporting pressure and the stress transfer of the superimposed coal pillar in this working face is obtained. By using the roof dynamic monitoring system to monitor the working resistance of the support in real time, it is concluded that the working resistance of the support during the coming pressure period becomes larger, the resistance of the support increases more frequently, and the mine pressure appears strongly when the working face is pushed to the corresponding area of the Jurassic goaf.
【作者单位】：辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金资助项目(51674135,51604139)
【分类号】：TD323

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