深部煤层开采软-硬-软互层组合底板应力分布与破坏特征模拟研究

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英文篇名：Simulation Study on Stress Distribution and Failure Characteristics of Soft-hard-soft Interbedded Composite Floor in Deep Seam Mining 作者：王文苗 ; 张培森 ; 魏杰 ; 安羽枫 英文作者：WANG Wenmiao;ZHANG Peisen;WEI Jie;AN Yufeng;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology; 关键词：软-硬-软互层 ; 深部开采 ; 底板应力变化 ; 位移变化 ; 塑性区分布 英文关键词：soft-hard-soft interbedding;;deep mining;;stress change of floor;;change of displacement;;distribution of plastic zone 中文刊名：MKAQ 英文刊名：Safety in Coal Mines 机构：山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地; 出版日期：2019-02-20 出版单位：煤矿安全 年：2019 期：v.50;No.536 基金：国家自然科学基金资助项目(51379119,51109124,51509149) 语种：中文; 页：MKAQ201902013 页数：5 CN：02 ISSN：21-1232/TD 分类号：63-66+72

摘要

以恒源煤矿Ⅱ633工作面为工程地质背景,运用FLAC3D5.0建立三维计算模型,对软-硬-软互层特定沉积结构底板在深部开采条件下的应力、位移以及底板塑性区变化进行研究。结果表明:在工作面推进过程中,煤层底板经历了集中应力压缩-底板隆起卸压-顶板垮落再压缩的反复破坏,应力变化曲线呈类"M"形,应力集中系数最大为1.74,采空区顶板垮落后,底板应力逐渐恢复到原岩应力的0.75～0.8倍左右;位移变化曲线呈"锯齿"状分布,最大向下位移量为-6.5 cm左右,最大底鼓量为+16.4 cm,工作面推进长度越长,底鼓跨距越大;工作面底板塑性区发育深度最大为12 m,发育范围逐渐扩大,且对比经验公式计算结果可得模拟结果的正确性与可靠性。
        Take Hengyuan Coal Mine II 633 working face as the engineering geological background, a three-dimensional calculation model was established by FLAC3 D5.0 to study the stress, displacement and the plastic zone variation of the floor under the condition of deep mining. The results show that: in the process of advancing the working face, the coal seam floor has experienced the repeated destruction of concentrated stress compression-floor uplift and pressure relief-roof caving and recompression. The stress variation curve shows an "M"shape, the maximum stress concentration coefficient is 1.74, the roof of the goaf falls behind, the stress of the floor is gradually restored to about 0.75 to 0.8 times of the original rock stress, and the displacement curve is"serrated". The maximum downward displacement is about-6.5 cm, the maximum floor heave is +16.4 cm,the longer the length of the working face is, the greater the span of the floor heave; the maximum development depth of the plastic zone in the floor of the working face is 12 m, and the development range is gradually expanded, and the accuracy and reliability of the simulation results can be obtained by comparing the results of the empirical formula.

引文

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