首页|工作面末采阶段回撤通道围岩应力分布特征及支护方案优化

工作面末采阶段回撤通道围岩应力分布特征及支护方案优化

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针对回采扰动下回撤通道末采阶段围岩失稳变形问题,采用理论分析、物理相似模拟、数值计算与现场验证的方法,开展了回采扰动下回撤通道末采阶段围岩应力分布特征研究,设计了回采扰动下回撤通道末采阶段围岩变形支护优化参数,验证了优化方案的应用效果.结果表明,回撤通道集中应力与工作面超前集中应力峰值相互叠加以及载荷传递引起围岩失稳变形;回撤通道煤柱应力随着贯通距的增加,呈现先增大后减小的趋势,并在贯通距为10-30 m达到峰值;提出了针对232205工作面末采段回撤通道的支护优化参数,优化后的方案使顶板下沉量减小了10.1 cm,两帮移近量减小了56.2 cm.回采扰动下回撤通道末采阶段围岩变形及控制研究对现场工程实践具有指导意义.
Stress distribution characteristics and supporting scheme optimization of surrounding rock in withdrawal channel at the end mining stage of working face
Aiming at the problem of instability and deformation of surrounding rock in the final mining stage of withdrawal channel under mining disturbance,the stress distribution characteristics research of surrounding rock in the final mining stage of withdrawal channel under mining disturbance was studied by means of theoretical analysis,physical similarity simulation,numerical calculation and field verification.The optimization parameters of surrounding rock deformation supporting in the final mining stage of withdrawal channel un-der mining disturbance were put forward,and the application effect of optimization scheme was verified.The results showed that the su-perposition of the concentrated stress of the withdrawal channel and the peak value of the advanced concentrated stress of the working face and the load transfer caused the instability and deformation of the surrounding rock.With the increase of the penetration distance,the stress of the coal pillar in the withdrawal channel increased first and then decreased,and reached the peak value in the range of 10-30 m.The supporting optimization parameters for the withdrawal channel of the end mining stage of the No.232205 working face were proposed.The optimized scheme reduced the roof subsidence by 10.1 cm and the two-side convergence by 56.2 cm.The research on the deformation and control of surrounding rock in the final mining stage of withdrawal channel under mining disturbance has guiding signif-icance for field engineering practice.

withdrawal channelinstability and deformation of surrounding rockoptimization of supporting parametersmining disturbance

祝凌甫、王永洁、曲秋扬

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天地(榆林)开采工程技术有限公司,陕西榆林 719000

中煤科工开采研究院有限公司,北京 100013

回撤通道 围岩失稳变形 支护参数优化 回采扰动

国家重点研发计划资助项目国家自然科学基金项目资助国家自然科学基金项目资助国家自然科学基金项目资助

2023YFC2907602521040915230417252304140

2024

10.19389/j.cnki.1003-0506.2024.09.041

能源与环保
河南省煤炭科学研究院有限公司 河南省煤炭学会

能源与环保

CSTPCD
影响因子：0.221
ISSN：1003-0506
年,卷(期)：2024.46(9)