底板软弱夹层对巷道围岩稳定性的影响分析

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英文篇名：Influence of Soft Interlayer Location in Coal Floor on Stability of Roadway Surrounding Rocks 作者：王建飞 英文作者：WANG Jianfei;Dongfang Yaozhou Coal Industry Co.,Ltd.,Datong Coal Mining Group Co.; 关键词：软弱夹层 ; 稳定性控制 ; 应力 ; 变形 ; 破坏 英文关键词：soft interlayer;;stability control of surrounding rocks;;stress;;deformation;;failure 中文刊名：MKXD 英文刊名：Coal Mine Modernization 机构：大同煤矿集团公司同发东周窑煤业股份公司; 出版日期：2019-07-23 出版单位：煤矿现代化 年：2019 期：No.152 语种：中文; 页：MKXD201905028 页数：4 CN：05 ISSN：37-1205/TD 分类号：91-94

摘要

煤层底板软弱层位易出现应力集中,增大巷道围岩稳定性控制难度。基于此,本文通过FLAC3D数值软件建立含底板软弱夹层的巷道围岩稳定性计算模型,分析了软弱夹层影响下巷道的应力、变形和破坏特征,研究了软弱夹层位置和厚度对巷道稳定性的影响规律。研究结果表明:①有无软弱夹层的对比分析结果显示,底板软弱夹层增大了巷道围岩稳定性控制的难度;②巷道底板围岩最大位移和锚喷支护层最大弯矩随软弱夹层厚度的增大而增大;③巷道底板围岩最大位移和锚喷支护层最大弯矩随软弱夹层距巷道底板距离的增大而减小;④针对底板软弱夹层的特点,提出了改变巷道围岩支护方法和强化破裂围岩体强度等施工建议。
        The stress concentration is easy to occur in the soft interlayer location of coal seam floor, which increases the difficulty of stability control in roadway surrounding rock. Based on this, roadway surrounding rock stability calculation model with soft interlayer was built by FLAC3 D numerical software. The stress, deformation and failure characteristics of roadway was analyzed under the influence of the soft interlayer. The influence law of the location and thickness of roadway stability with soft interlayer was studied. The results show that: 1) The comparative analysis results of whether there is a weak interlayer show that the soft interlayer increases the difficulty of stability control in roadway surrounding rock. 2) The maximum displacement and maximum bending moment of roadway floor surrounding rock increase with the increase of the thickness of weak interlayer. 3) The maximum displacement and maximum bending moment of roadway floor surrounding rock decrease with the increase of the distance between soft interlayer and roadway floor. 4) According to the characteristics of weak interlayer of floor, some construction suggestions was put forward, such as changing the supporting method of roadway surrounding rock and strengthening the strength of fractured surrounding rock mass.

引文

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