| 基于岩梁-块体理论的巷道软弱层直接顶板破坏形式研究 |
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| 引用本文： | 陈虎,叶义成,王其虎,胡南燕,刘冉,江慧敏.基于岩梁-块体理论的巷道软弱层直接顶板破坏形式研究[J].岩土力学,2020(4):1447-1454. |
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| 作者姓名： | 陈虎 叶义成 王其虎 胡南燕 刘冉 江慧敏 |
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| 作者单位： | 武汉科技大学资源与环境工程学院;武汉科技大学 |
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| 基金项目： | 湖北省2017年安全生产专项(No.HBAJ(2017)-35);湖北省自然科学基金(No.2017CFC831)。 |
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| 摘 要： | 巷道软弱层直接顶板具有挠曲破坏、整体冒落和拱形冒落3种破坏形式,顶板厚度变化是影响其破坏形式的主要原因之一。对此,基于梁理论和块体理论,构建了顶板岩梁-块体力学模型,以揭示软弱层直接顶板破坏形式的变化规律。在此基础上,定义了挠曲破坏安全系数和剪切破坏安全系数,建立了顶板不同破坏形式的顶板临界厚度计算模型,以判定不同顶板厚度对应的顶板破坏形式。通过实例演算显示,随着顶板厚度的增加,顶板破坏形式由挠曲破坏逐渐变为整体冒落再变为拱形冒落。同时,当顶板厚度超过一定值时,冒落拱高度不再显著增加。基于相同的工程条件和力学参数,通过实例演算和数值模拟对比分析,计算得到演算工况下从挠曲破坏到整体冒落的顶板临界厚度均为0.14 m,从整体冒落到拱形冒落的顶板临界厚度为0.8m,结果具有一致性。表明应用顶板临界厚度计算模型能够有效地判定顶板破坏形式。该研究成果可为矿山巷道在软弱层直接顶板管控及支护方案设计提供理论参考。
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| 关 键 词： | 软弱层直接顶板 顶板厚度 岩梁-块体理论 破坏形式 临界值 |
Study of direct roof failure form of soft layer in roadway based on rock beam-block theory |
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| CHEN Hu,YE Yi-cheng,WANG Qi-hu,HU Nan-yan,LIU Ran,JIANG Hui-min.Study of direct roof failure form of soft layer in roadway based on rock beam-block theory[J].Rock and Soil Mechanics,2020(4):1447-1454. |
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| Authors: | CHEN Hu YE Yi-cheng WANG Qi-hu HU Nan-yan LIU Ran JIANG Hui-min |
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| Institution: | (School of Resource&Environmental Engineering,Wuhan University of Science&Technology,Wuhan,Hubei 430081,China;Industrial Safety Engineering Technology Research Center of Hubei Province,Wuhan University of Science&Technology,Wuhan,Hubei 430081,China) |
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| Abstract: | The direct roof of weak stratum in roadway has three kinds of failure modes:deflection failure,integral caving and arch caving.The change of roof thickness is one of the main reasons affecting the failure modes.Therefore,based on beam theory and block theory,a mechanical model of roof rock beam-block was constructed to reveal the changing law of the direct roof failure form in weak strata of roadway.On this basis,the safety factors of flexural failure and shear failure were defined,and the calculation models of critical thickness of the roof with different failure modes were established to determine the corresponding failure modes of the roof with different roof thicknesses.The case study shows that with the increase of roof thickness,the failure mode of the roof gradually changes from flexural failure to integral caving and then to arch caving.At the same time,when the thickness of the roof exceeds a certain value,the height of the caving arch no longer increases in a substantial manner.Based on the same engineering conditions and mechanical parameters,a comparative analysis between numerical simulation and a case calculation was carried out.The critical thickness of the roof under the case calculation conditions was 0.14 m from flexural failure to overall collapse,and 0.8 m from overall collapse to arch collapse.The numerical simulation and case calculation results were consistent.It shows that the calculation model of the critical thickness of the roof can effectively determine the failure form of the roof.The research results can provide theoretical reference for direct roof control and support scheme design of mine roadway in weak stratum. |
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| Keywords: | soft layer direct roof roof thickness rock beam-block theory failure form critical value |
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