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| Research and application of hollow grouting anchor in broken composite roof reinforcement |
| Wu Fangchao |
| Zhangcun Mine of Jizhong Energy Resources Group Co., Ltd., Xingtai 054100, China |
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Abstract Hollow grouting anchor cable is a new type of grouting material, which is easy to use and install, and has obvious effect in improving roof support strength. Aiming at the problem of difficult support of soft rock fracture in the local section of No.2610 lower roadway, combined with its own production geological conditions in Zhangcun Mine, the support technology under the condition of broken composite roof was systematically studied, the construction technology scheme of hollow grouting anchor cable was formulated and was applied in the actual production. The results showed that after grouting anchor cable reinforcement, the roadway roof was re-formed into a complete whole, and the subsidence in the first week was 10 mm. In the later stage, it gradually tended to be stable, and the roadway roof was effectively controlled.
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