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A Practical Nonprobabilistic Reliability Assessment Method on Key Strata Shear Failure in Longwall Mining

机译：长壁开采关键层剪切破坏的实用非概率可靠性评估方法

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摘要

Roof cutting has long been a potential hazard factor in longwall panels in some diggings in China. Meanwhile, the key strata structural reliability, which provides an assessment on the stability of overlying roof strata, may be a significant reference for support design in underground coal mines. This paper aims to investigate a practical nonprobabilistic reliability assessment method on key strata. The mechanical tests and the hollow inclusion triaxial strain tests were conducted to measure relevant mechanical parameters and in situ stress. Furthermore, against the typical failure features in Datong Diggings, China, a shear failure mechanical model of key strata is proposed. Then, an allowable-safety-factor based nonprobabilistic stability probability assessment method is given. The sensitivity of geometrical dimensions and uncertainty levels of friction angle and cohesion are further studied. It is found that thickness and span of key strata have more dominative effect on key strata's stability compared with the other factor and the increase of uncertainty levels results in decrease of stability probability.
机译：长期以来，在中国的某些挖掘中，屋顶切割一直是长壁板的潜在危险因素。同时，关键地层结构的可靠性可以评估上覆顶板地层的稳定性，可能为地下煤矿的支护设计提供重要参考。本文旨在研究一种实用的关键层非概率可靠性评估方法。进行了机械测试和中空夹杂物三轴应变测试，以测量相关的机械参数和原位应力。此外，针对中国大同地区典型的破坏特征，提出了关键地层的剪切破坏力学模型。然后，给出了一种基于允许安全系数的非概率稳定性概率评估方法。进一步研究了几何尺寸的敏感性以及摩擦角和内聚力的不确定性水平。结果表明，与其他因素相比，关键层的厚度和跨度对关键层的稳定性具有更大的支配性，不确定性水平的提高导致稳定概率的降低。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第10期|893019.1-893019.8|共8页
  • 作者

    Luan Hebing; Wang Jiachen; Ma Guowei; Zhang Ke;

  • 作者单位

    Univ Western Australia, Sch Civil Environm & Min Engn, Perth, WA 6009, Australia.;

    China Univ Min & Technol Beijing, Fac Resources & Safety Engn, Beijing 100083, Peoples R China.;

    Univ Western Australia, Sch Civil Environm & Min Engn, Perth, WA 6009, Australia.;

    Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;

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