摘要
工作面末采阶段回撤通道围岩极易发生变形破坏,采用切顶卸压的方式,可实现围岩高应力转移,降低巷道围岩的变形破坏程度。本文以范各庄矿3573N工作面为研究背景,采用数值模拟的研究方法,分析了工作面回撤通道切顶后围岩应力、位移和塑性区的变化特征。结果表明,回撤通道顶部围岩应力出现卸压的现象,支承压力转移至煤柱,回撤通道围岩呈现为剪切与张拉塑性区、剪切塑性区,提出了回撤通道顶板采用“锚杆+锚索”联合支护、两帮采用锚杆支护的围岩控制方式。对比了支护与未支护条件下巷道围岩塑性区,发现支护后塑性区范围明显小于未支护条件的塑性区。研究成果对回撤通道围岩控制理论与技术有重要的支撑作用。
The surrounding rock of the withdrawal channel in the final mining stage of the working face is prone to deformation and failure.The method of roof cutting and pressure relief can realize the high stress transfer of the surrounding rock and reduce the deformation and failure degree of the surrounding rock of the roadway.No.3573N Face of Fangezhuang Mine was taken as the research background,the numerical simulation method was used to analyze the variation characteristics of surrounding rock stress,displacement and plastic zone after roof cutting in the withdrawal channel of the working face.The results showed that the stress of the surrounding rock at the top of the retracement channel was relieved,the supporting pressure was transferred to the coal pillar,and the surrounding rock of the retracement channel was presented as shear and tension plastic zone and shear plastic zone.The surrounding rock control method of'bolt+anchor cable'combined support for the roof of the retracement channel and bolt support for the two sides was proposed.Comparing the plastic zone of roadway surrounding rock under supporting and unsupported conditions,it was found that the range of plastic zone after supporting was obviously smaller than that under unsupported conditions.The research results had an important supporting role in the surrounding rock control theory and technology of the withdrawal channel.
作者
佟盛伟
董云龙
曹晓亮
Tong Shengwei;Dong Yunlong;Cao Xiaoliang(Anlong County Energy Bureau,Qianxinan State 562400,China;Xipang of Dongpang Mine,Jizhong Energy Resources Co.,Ltd.,Xingtai 054000,China)
出处
《煤炭与化工》
2026年第2期6-11,共6页
Coal and Chemical Industry
关键词
回撤通道
切顶卸压
数值模拟
塑性区
retracement channel
roof cutting pressure relief
numerical simulation
plastic zone
