| 近距离煤层水力压裂切顶卸压护巷技术研究 |
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| 引用本文： | 刘爱卿.近距离煤层水力压裂切顶卸压护巷技术研究[J].煤炭工程,2020,52(4):38-42. |
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| 作者姓名： | 刘爱卿 |
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| 作者单位： | 天地科技股份有限公司开采设计事业部，煤炭科学研究总院开采分院 |
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| 基金项目： | 天地科技股份有限公司科技创新创业资金专项项目;开采设计事业部"科技创新基金" |
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| 摘 要： | 针对近距离煤层底抽巷在上部工作面采动后处于高应力状态而难以维护的问题,开展了水力压裂切顶卸压护巷技术研究,得出:工作面采动后坚硬厚顶板易形成较长时间跨度的悬顶效应是底抽巷压力显现的关键因素;水力压裂消除或减弱了坚硬顶板形成的悬顶效应,提高了采空区上覆岩层冒落性,改变了煤柱中应力分配比例,改善了底抽巷应力状态;现场采用同孔多段分次后退式水力压裂技术,结合跨式钻孔封隔器,在顶板坚硬岩层中形成明显的人工裂缝,缓解了底抽巷围岩应力集中,降低了底抽巷的维护难度,取得了良好的效果。
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| 关 键 词： | 近距离煤层 水力压裂 悬顶效应 围岩支护 切顶卸压 |
| 收稿时间： | 2019-10-29 |
| 修稿时间： | 2020-02-18 |
Research on Hydraulic Fracturing Technology for Roadway Protectionin Close Distance Coal |
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| LIU Ai-qing.Research on Hydraulic Fracturing Technology for Roadway Protectionin Close Distance Coal[J].Coal Engineering,2020,52(4):38-42. |
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| Authors: | LIU Ai-qing |
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| Affiliation: | (School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Coal Mining and Design Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China) |
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| Abstract: | For the bottom pumping road of close-distance coal seam, it is in a high stress state after the upper working face mining and it is difficult to maintain. The hydraulic fracturing technology is studied. It is concluded that the hard roof of the hard surface is easy to form a long time span. The overhanging effect is the key to the pressure of the bottom coal roadway. Hydraulic fracturing eliminates or weakens the formation of hard roof and improves the overburden of the goaf. The proportion of stress distribution in the coal pillar is changed and the stress state of the bottom pumping road is improved; The multi-stage retracting hydraulic fracturing technology combined with the straddle drilling packer forms obvious artificial cracks in the hard rock strata of the roof, which reduces the stress concentration of the surrounding rock of the bottom pumping roadway and reduces the maintenance difficulty of the bottom pumping roadway. |
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| Keywords: | contiguous coal seams hydraulic fracturing overhanging effect surrounding rock support roof cutting |
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