富水砂层巷道溃水溃沙因素分析及防治对策

发布时间：2019-04-19 09:02

【摘要】：富水砂层巷道掘进,由于砂层胶结力差、强度低,开挖后迎头易发生大跨度变形、失稳破坏。针对2煤回风巷掘进至F26断层时发生联锁性突水动力灾害,采用工程调查、理论分析和现场实践等综合方法,提出了注浆封堵加固、定向疏放水工艺。结果表明:施工钻场对突水区域进行注浆封堵加固,能有效固化该区域岩(煤)体,改善岩(煤)体结构及其力学性能,提高整体稳定性,1号、2号封堵体堵水效果较好;同时为防止泥沙充填裂隙通道,造成二次突水,在带式输送机巷布设钻场(5个定向钻孔、孔径Φ113mm、孔深45m),对漏顶区域及上部含水层进行可控疏放,水位变化曲线观测得出钻孔水位与巷道出水量稳定、突水点处泄水通道畅通,疏放水效果较好。
[Abstract]:Due to the poor cementation force and low strength of sand layer, it is easy to take place large span deformation and instability damage after excavation in the tunnel with water-rich sand layer as a result of its poor cementation force and low strength. In view of the interlock water inrush dynamic disaster occurred when driving to F26 fault in 2 coal return air roadway, the technology of grouting sealing and strengthening, directional drainage and drainage is put forward by adopting comprehensive methods such as engineering investigation, theoretical analysis and on-the-spot practice. The results show that the grouting sealing and strengthening of the water inrush area in the construction drilling field can effectively solidify the rock (coal) body in this area, improve the structure and mechanical properties of the rock (coal) body, and improve the overall stability, and the water plugging effect of No. 1 and No. 2 sealing bodies is better. At the same time, in order to prevent sediment filling crack channel and cause secondary water inrush, a drilling field (5 directional drilling holes, diameter 桅 113 mm, hole depth 45 m) was set up in the belt conveyor lane, and the drain top area and the upper aquifer were controlled and dredged. The observation of the water level change curve shows that the drilling water level and the tunnel output are stable, the drainage channel at the inrush point is smooth, and the drainage effect is better.
【作者单位】：神华宁夏煤业集团有限责任公司;西安科技大学能源学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB251600) 国家自然科学基金(煤炭联合基金)重点项目(U13612030) 陕西省重点科技创新团队计划(2013KCT-16)
【分类号】：TD745

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