Aiming at the broken failure of anchor cable in the mining roadway roof during the mining process, the lagging support scheme of anchor cable is proposed. Based on the results of indoor anchor cable pull-out test, the Cable element in FLAC^3D is modified to realize the extension breaking of anchor cable in the calculation process. Furthermore, the minimum principal stress and volume strain rate mutation point are used as the failure criteria of the anchor cable. Through the comparative analysis of five anchor cable lagging support schemes of 6208 transport tunnel in Wangzhuang Mine Coal, the results demonstrate that the lagging support reduces the initial support resistance of the supporting structure. With the increase of lagging time, the ability of anchor cable to adapt to deformation increases gradually. When the lagging time reaches the gentle area of roadway deformation, its ability to adapt to deformation remains stable. Finally, it was determined that the support should start at 10–15 m of the anchor cable lagging head of the 6208 transport tunnel. Industrial tests show that the lagging support scheme ensures that the anchor cable can withstand a certain deformation, and the support body has no broken failure, which effectively controls the large mining-induced deformation of surrounding rock.

中文翻译：

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基于FLAC3D修正模型的煤巷锚索滞后支护机构研究

针对矿井巷道顶板在开采过程中锚索断裂失效问题，提出了锚索滞后支护方案。基于室内锚索拉拔试验结果，FLAC ^3D中的Cable元素在计算过程中进行了修改，实现了锚索的拉断。此外，最小主应力和体积应变率突变点被用作锚索的破坏准则。通过对王庄煤矿6208运输隧道5种锚索滞后支护方案的对比分析，结果表明，滞后支护降低了支护结构的初始支护阻力。随着滞后时间的增加，锚索对变形的适应能力逐渐增强。当滞后时间达到巷道变形平缓区时，其适应变形能力保持稳定。最后确定支护应从6208运输隧道锚索包头10-15m处开始。