深埋沿空留巷采动变形特征及应力分布规律探索

doi:10.13722/j.cnki.jrme.2017.1110

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摘要我国深部煤炭资源储量巨大，但巷道变形失稳是制约深部资源高效开采的一个重要因素。为了探究超千米埋深沿空留巷巷道在第一次回采期间的变形、应力分布规律以及锚杆支护效果，以平煤十二矿己14–31050工作面下进风巷为工程背景，利用收敛仪和锚杆应力计对巷道断面变形和顶板锚杆应力进行长期监测，并结合有限差分法分析了在回采过程中整个工作面应力分布以及变形特征。结果表明：(1) 在第一次回采阶段，基于锚杆受力以及巷道断面收敛规律，可将巷道顶板划分为5个不同区域，并确定了各区域范围；(2) 在回采期间，锚杆受力曲线除了的单峰曲线外，还存在着双峰或者多峰曲线、应力失效恢复曲线；(3) 深入分析锚杆预紧力以及峰值拉力特征，确定了合理预紧力区间为50～70 kN。以上研究成果对于千米深井巷道支护设计具有一定的借鉴意义。

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	汪文勇1
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	高明忠1
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	谢晶1
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	刘强1
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	李安强1
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	陈海亮1
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关键词 ：采矿工程, 沿空留巷, 巷道变形, 应力分布

Abstract：China has a rich reserve of deep coal resources，but the deformation instability of the roadway，as an important factor，restricts the efficient exploitation of the deep resources. The purpose of this paper is to study the convergence deformation and the stress distribution of the deep roadway during coal mining，and to evaluate the effect of bolt support. On the JI 14–31050 working face of the No. 12 mine of China Pingmei Shenma Group，long-term monitoring of roadway deformation and roof bolt stress is carried out by using the convergence instrument and the bolt stress gauge. The stress distribution and deformation characteristics of the whole working face during the mining process are analyzed by finite difference method. The results show that：(1) In the first stage of mining，the roof of roadway can be divided into five areas according to the stress of bolt and the convergence curve of roadway. (2) During the period of with drawl，the anchor stress curve shows the common single-peak curve，and there still exists double-peak curve，multi-peak curve and stress failure recovery curve. (3) By comparing the bolt preload and peak tension，the range of reasonable pre-tightening force is 50–70 kN. The research results of this paper have reference value for the support design of the tunnel in the kilometer deep mine.

Key words： mining engineering gob-side entry retaining roadway deformation stress distribution

引用本文:

汪文勇1，2，高明忠1，2，王满3，4，谢晶1，2，刘强1，2，李安强1，2，陈海亮1，2. 深埋沿空留巷采动变形特征及应力分布规律探索[J]. 岩石力学与工程学报, 2019, 38(S1): 2955-2963.
WANG Wenyong1，2，GAO Mingzhong1，2，WANG Man3，4，XIE Jing1，2，LIU Qiang1，2，LI Anqiang1，2，CHEN Hailiang1，2. Study on characteristics of deformation and stress distribution of gob-side entry retaining in the ultra-deep mine. , 2019, 38(S1): 2955-2963.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1110 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2955

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