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Influence of abnormal stress under a residual bearing coal pillar on the stability of a mine entry

机译:残余煤柱下异常应力对矿井巷道稳定性的影响

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摘要

Mine entries close to residual bearing coal pillars (RBCPs) will suffer large deformation that may cause rock burst. To better understand the deformation mechanism and develop safe and practical guidelines for entry design, most studies focus on the absolute size of the stress field in and around the pillar. In this paper, we present a new approach to analyze the abnormal stress field close to a RBCP that uses the stress concentration coefficient (SCC), stress gradient (SG), and coefficient of lateral pressure (CLP) to describe the stress state induced by the RBCP. Based on elastic theory and a mathematical model for the abutment stress in the RBCP, an analytical solution for the abnormal stress in the strata below the RBCP was derived and the characteristics of the abnormal stress for a case study of a coal mine in China were analyzed. The results show that the abnormal stress field around the pillar is characterized by four distinct zones: azone of high SCC, high SG, and CLP less than 1, a zone of high SCC, low SG, and CLP less than 1, a zone of low SCC, SG close to 0, and CLP greater than 1, and a zone of SCC close to 1, SC close to 0, and CLP close to 1. Based on this zoning pattern, a numerical model was established to study the combined effects of the abnormal stress on the stability of the entry. The most stable zone was determined based on a model of the Xinrui coal mine and verified by field measurements at the mine. Our conclusions can be used as guidelines for designing safe entry layouts in similar geological and mining settings.
机译:靠近残余承压煤柱(RBCP)的矿井入口将遭受大变形,可能会导致岩石破裂。为了更好地了解变形机制并制定安全实用的入口设计准则,大多数研究都集中在支柱内部和周围的应力场的绝对大小。在本文中,我们提出了一种新的方法来分析靠近RBCP的异常应力场,该方法使用应力集中系数(SCC),应力梯度(SG)和侧向压力系数(CLP)来描述由应力引起的应力状态。 RBCP。基于弹性理论和RBCP基台应力数学模型,推导了RBCP下方地层异常应力的解析解,分析了以中国某煤矿为例的异常应力特征。 。结果表明,柱子周围的异常应力场具有四个明显的区域:高SCC,高SG和CLP小于1的区域,高SCC,低SG和CLP小于1的区域,CCC小于1的区域。低SCC,SG接近0,CLP大于1,SCC区域接近1,SC接近0,CLP接近1。基于这种分区模式,建立了一个数值模型来研究组合效应异常对入口稳定性的影响。根据新瑞煤矿的模型确定了最稳定的区域,并通过该矿场的现场测量进行了验证。我们的结论可以用作在相似地质和采矿环境中设计安全入口布局的指南。

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  • 来源
    《矿业科学技术学报:英文版》 |2017年第006期|P.945-954|共10页
  • 作者单位

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

    [2]School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

    [3]Mewbourne School of Petroleum and Geological Engineering, University of Oklahoma, Norman, OK 73019, USA;

    [1]School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

  • 收录信息 中国科学引文数据库(CSCD);
  • 原文格式 PDF
  • 正文语种 CHI
  • 中图分类 矿业工程;
  • 关键词

    Residual bearing coal pillar; Abnormal stress; Entry layout; Mechanical analysis; Numerical computation;

    机译:残余煤柱;异常应力;入口布置;力学分析;数值计算;
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