膏体充填开采条带煤柱覆岩稳定效应研究

发布时间：2018-03-25 13:19

本文选题：膏体充填　切入点：条带开采　出处：《煤炭科学技术》2017年09期

【摘要】：针对膏体充填开采回收矿井条带煤柱中的覆岩稳定性问题,以许厂煤矿建筑物下条带煤柱开采为工程背景,采用理论分析、数值模拟和现场实测的方法,研究了膏体充填回收煤柱时的覆岩"活化"机理、顶板运移规律及覆岩稳定性影响因素。研究结果表明:采空区在外力扰动下会产生空洞、裂隙,随着岩块结构的演变,其对采场覆岩支护体系造成破坏,可通过控制充填体强度、充填率、充填步距及支护强度来改善采场围岩支护体系,要求充填体早期强度应大于0.13 MPa,而后期强度可按照与充填体宽度变化规律进行适当调整;模拟试验结果发现:覆岩及地表下沉曲线峰值位于条带煤柱中部区域,顶板最大下沉量为1 200 mm,邻近采空区覆岩"活化"程度达到最大;采取膏体充填开采回收煤柱,巷道矿压显现不明显,工程应用中取得了良好效果。
[Abstract]:In view of the stability of overburden in the recovery of strip pillar in plaster filling mining, taking the mining of strip pillar under the building of Xuchang coal mine as the engineering background, the methods of theoretical analysis, numerical simulation and field measurement are adopted. The mechanism of overburden "activation", the law of roof migration and the influencing factors of overburden stability in plaster filling and recovering coal pillar are studied. The results show that cavities and fissures will occur in goaf under disturbance of external force, with the evolution of rock block structure. It can be used to improve the surrounding rock support system of stope by controlling the backfill strength, filling rate, filling step distance and supporting strength. The early strength of the backfill should be greater than 0.13 MPA, and the later strength can be adjusted according to the variation law of the backfill width. The simulation results show that the peak value of the overburden and surface subsidence curve lies in the middle region of the striped coal pillar. The maximum subsidence of roof is 1 200 mm, and the "activation" degree of overburden in the adjacent goaf reaches the maximum. When the recovery pillar is mined with paste filling, the mine pressure of roadway is not obvious, and good results have been obtained in engineering application.
【作者单位】：中国矿业大学矿业工程学院;山东能源淄博矿业集团有限责任公司;山东省充填开采工程技术研究中心;
【基金】：山东省泰山学者专项经费资助项目(201309)
【分类号】：TD32;TD823.7

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