切顶卸压沿空留巷围岩控制效果数值模拟研究被引量：27

Numerical study on surrounding rock control effect of gob-side entry retaining by roof cutting and pressure relief

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摘要为研究切顶卸压对沿空留巷围岩控制效果的影响规律,基于UDEC软件,对沿空留巷侧向顶板悬顶与垮落2种情况下的围岩受力变形特征进行深入分析。研究表明:相对于直接顶悬顶状态,直接顶垮落时煤帮侧煤层和巷旁支护墙体上的垂直应力集中系数分别降低0.19和0.49;直接顶垮落状态下沿空巷道顶板下沉、底板鼓起、煤帮内移和墙体内移量相对于直接顶未垮落状态下,分别降低73%、60%、27%、75%;巷道侧向悬顶是造成沿空巷道围岩大变形的重要原因,切顶会促使采空区上方直接顶有效垮落,采空区上覆岩层的重力无法有效向巷道周围的煤岩体中传递,且垮落的岩层会对顶板起到一定的支撑作用,有助于降低巷道围岩所承受的压力。 To study the influence of roof cutting and pressure relief on the surrounding rock control effect of gob-side entry retaining, numerical simulation was carried out by UDEC software, and the stress and deformation characteristics law of roadway surrounding rock under two states of whether the lateral roof collapsed or not were analyzed. The results show that compared with the state of the direct roof hanging, the vertical stress concentration coefficient of the coal seam on the coal side and the supporting wall beside the roadway are reduced by 0.19 and 0.49 respectively when the direct roof collapses. Under the condition of direct roof caving, the roof settlement, floor heave, coal wall internal displacement and wall internal displacement of roadway are reduced by 73%, 60%, 27% and 75% of that of direct roof hanging respectively. The direct roof hanging is an important reason for the large deformation of surrounding rock in gob-side entry. Cutting the roof will make the direct roof above the goaf collapse effectively, and the weight of overlying strata can not effectively transfer to the surrounding rock, and the collapsed rock stratum will play a certain supporting role on the roof, and also help to reduce the surrounding rock pressure.

作者邓晓刚栾恒杰刘建荣 DENG Xiaogang;LUAN Hengjie;LIU Jianrong(Technical Center,Shandong Energy Linyi Mining Groupy Linyi 276017,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Inner Mongolia Shanghaimiao Mining Co.,Ltd.,Ordos 016299,China)

机构地区山东能源临沂矿业集团技术中心山东科技大学能源与矿业工程学院内蒙古上海庙矿业有限责任公司

出处《煤矿安全》 CAS 北大核心 2021年第9期239-244,共6页 Safety in Coal Mines

基金山东省自然科学基金资助项目(ZR2019BEE065)。

关键词沿空留巷切顶卸压围岩控制围岩应力围岩变形数值模拟 gob-side entry retaining roof cutting and pressure relief surrounding rock control surrounding rock stress surrounding rock deformation numerical simulation

分类号 TD322.5 [矿业工程—矿井建设]

作者简介邓晓刚(1981-),山东广饶人,工程师,本科,2016年毕业于山东科技大学,现任山东能源临矿集团技术中心副主任,主要研究方向为巷道围岩稳定性控制。