基于中厚板理论的顶板断裂失稳规律研究

doi:10.13722/j.cnki.jrme.2023.1224

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摘要厚顶板工作面动载现象强烈，动载冲击作用下煤壁片帮、支架压架等现象常有发生。为了提升厚顶板条件下的采场围岩控制效果，以赵固二矿14030工作面为工程背景，采用理论分析、数值模拟和现场实测等方法，研究顶板变形与应力特征、破坏模式，探究动载效应及控制方法。结果表明：工作面初次来压时，最大拉应力和最大剪应力位于煤壁侧和开切眼侧中点，顶板发生拉伸破坏；周期来压时顶板在煤壁侧两端头形成了剪应力集中区，且剪切裂隙明显发育，顶板发生拉剪混合破坏。得到工作面推进距离与顶板厚度对拉(剪)应力的影响特征，分析顶板厚度效应对顶板破坏模式的影响。基于PFC3D建立顶板初次破断和周期破断数值模型，确定了顶板破坏形态、裂隙分布特征与破坏模式。基于砂体介入和厚度效应解释了顶板易发生剪切破坏的原因，揭示了顶板动载产生机制。利用动量守恒定理确定了顶板不同破断位置对采场造成的动载冲击力，得到液压支架受动载冲击影响的工作阻力，提出动载控制方法。研究结果可为中厚顶板或不满足薄板条件的顶板提供理论依据，指导中厚顶板工作面的安全生产。

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	杨胜利1
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	岳豪1
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	唐岳松1
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	陈勇升1
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	惠鼎恒1
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关键词 ：采矿工程, 中厚板, 初次来压, 周期来压, 动载冲击

Abstract：The working face of the thick roof is subject to strong dynamic loading，often resulting in coal rib spalling and hydraulic support crushing. In order to enhance the ground control under the thick roofs，the deformation and stress characteristics of the roof，failure modes，dynamic loading effects and control methods were investigated by taking the 14030 working face of the Zhaogu Second Coal Mine as the background. Based on the results from theoretical analysis，numerical simulation，and field measurement，it is found that the maximum tensile stress and maximum shear stress are located at the midpoint of the coal wall side and the cutting eye side during the first weighting，and the roof undergoes tensile failure. During periodic weighting，shear stress concentration zones form at both ends on the coal wall side，with significant development of shear cracks，resulting in mixed tensile-shear failure of the roof. The impact characteristics of the working face advance distance and the roof thickness on tensile (shear) stress were determined. The influence of roof thickness on failure mode was analyzed. Numerical models of first and periodic weighting of the roof were established using PFC3D，determining the roof failure morphology，crack distribution characteristics and failure modes. Based on the intervention of the sand and thickness effect，the reasons for the occurrence of shear failure in the roof were explained，revealing the mechanism of dynamic loading on the roof. By utilizing the principle of momentum conservation，the dynamic impact force caused by different fracture positions of the roof was calculated. The working resistance of the hydraulic support under dynamic load impact was obtained，and methods for dynamic load control were proposed. The research results can provide theoretical basis for medium-thick roofs or roofs that do not meet the conditions of thin plates，and help guide the safe production of medium-thick roof working faces.

Key words： mining engineering medium thick plate first weighting periodic weighting dynamic impact

引用本文:

杨胜利1，2，3，岳豪1，2，3，4，唐岳松1，2，3，陈勇升1，2，3，惠鼎恒1，2，3. 基于中厚板理论的顶板断裂失稳规律研究[J]. 岩石力学与工程学报, 2024, 43(9): 2092-2107.
YANG Shengli1，2，3，YUE Hao1，2，3，4，TANG Yuesong1，2，3，CHEN Yongsheng1，2，3，HUI Dingheng1，2，3. Study on the characteristics of roof fracture instability based on the theory of medium thick plate. , 2024, 43(9): 2092-2107.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1224 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I9/2092

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