• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
切顶卸压无煤柱自成巷顶板下沉分析及控制技术
  • Title

    Analysis and control technology of roof subsidence in non-pillar gob-side entryretaining formed by roof cutting and pressure release

  • 作者

    朱珍袁红平张科学高玉兵

  • Author

    ZHU Zhen,YUAN Hongping,ZHANG Kexue,GAO Yubing

  • 单位

    中国矿业大学(北京) 深部岩土力学与地下工程国家重点实验室中国矿业大学(北京) 力学与建筑工程学院陕西瑞能煤业有限责任公司华北科技学院安全工程学院煤炭科学研究总院 智能控制技术研究分院

  • Organization
    1.State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining & Technology(Beijing),Beijing ,China;2.School of Mechanics and Civil Engineering,China University of Mining and Technology( Beijing) ,China; 3.Shaanxi Ruineng Coal Co.,Ltd.,Yanan ,China;4. School of Safety Engineering, North China Institute of Science and Technology,Beijing ,China;5.Intelligent Control Technology Research Branch,China Coal Research Institute,Beijing ,China
  • 摘要

    基于切顶卸压无煤柱自成巷技术原理,分析了沿空切顶巷道围岩结构体系演化过程及上覆岩层荷载传递机制,揭示了留巷过程中基本顶岩层“固支梁结构→砌体梁结构→简支梁结构”和切顶岩层“固支梁结构→一端固支、一端简支梁结构→悬臂梁结构”的围岩结构演变过程;基于顶板岩层运动特征及围岩结构状态,指出切顶卸压无煤柱自成巷顶板下沉主要由基本顶“给定变形”下沉量和切顶岩层离层量共同组成,通过建立顶板下沉力学模型导出了基本顶“给定变形”下沉的计算公式,并探讨了其下沉量与切顶高度、开采厚度的影响关系;最后针对顶板下沉的主要影响因素提出了相应的控制对策。工程实践表明,通过采取针对性的控制策略,留巷顶板下沉总量得到有效控制,理论计算值与实际下沉量较为吻合,侧面验证了无煤柱自成巷顶板下沉计算模型的合理性。

  • Abstract
    In order to control roof subsidence in non-pillar gob-side entry retaining formed by roof cutting and pressure release,the evolution process of the surrounding rock structures and transfer mechanism of the overburden loads around the retained entry were analyzed based on the principle of gob-side entry retaining formed by roof cutting and pressure release.According to the motion characteristics and structure behaviors of the entry surroundings,it was obtained that the roof subsidence was mainly composed of the given deformation of the main roof and the separation of the cutting roof.Also,a theoretical calculating formula of the given deformation was derived by stablishing mechanical model for the entry surroundings.Besides,the relationship between the subsidence and the mining height and the cutting height were discussed in the study.Finally,based on the theoretical analysis,some specific strategies were proposed to control the roof subsidence.Depending on engineering geological conditions in No.117 mining face of Ruineng Coal Mine,theoretical calculation results showed that the subsidence of roof near the goaf and away from the goaf was 319.5 mm and 106.5 mm separately,which was basically consistent with the field measurement results.The research results could provide references for the analysis of surrounding rock movement and control in non-pillar gob-side entry retaining formed by roof cutting and pressure release.
  • KeyWords

    roof cutting and pressure release; gob-side entry retaining; non-pillar mining; roof subsidence; surrounding rock control

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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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