Study on the control effect of conventional bolt cable supporting surrounding rock based on butterfly plastic zone theory
The effectiveness of conventional anchor-cable support is limited for the large deformation of mining-induced roadway.The paper uses theoretical analysis,numerical simulation,and engineering case analysis to investigate the stress distribution of the surrounding rock,the size of the plastic zone,and the effect of deformation and failure control caused by conventional anchor-cable support in mining roadway.The results show that:(1)Bidirectional non-isobaric stress environment around the mining roadway promotes the development of the plastic zone from circular to elliptical or even butterfly-shaped,which is significantly affected by the strength of the surrounding rock.(2)Conventional anchor-cable support cannot significantly improve the stress field around the mining roadway.The control rate of continuous deformation of the surrounding rock in the roadway by strengthening support is related to the basic stress.(3)The stability control of the surrounding rock in the mining roadway should mainly rely on stress regulation,supplemented by conventional support.Flexible support combined with grouting modification and reinforcement of sensitive areas is the key.The research results can help to further understand the effect of conventional anchor-cable support on mining roadway and provide reference for surrounding rock control.
mining engineeringmining roadwayconventional supportplastic zoneregional stress fielddeformation failure of roadway
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