高压旋喷桩钢管组合拱在斜井含水砂层施工中的应用

Application of High Pressure Jet-Grouted Pile and Steel Pipe Combined Arch in Constructing Inclined Shaft in Water-Bearing Sand Layer

针对煤矿斜井含水砂层施工中,容易发生涌水、涌砂及坍塌等安全事故的问题,研究了高压旋喷桩钢管组合拱施工技术,介绍了其工艺原理,并通过数值计算,分析了有、无旋喷桩钢管组合拱支护措施时,斜井围岩变形及应力变化规律。研究结果表明,高压旋喷桩钢管组合拱施工技术,能够有效地控制斜井围岩变形破坏,取得较好的支护效果。应用该项技术,安全顺利地穿越了陕西魏墙煤矿回风斜井含水砂层,取得了预期效果。该项技术具有推广应用价值。

Constructing inclined shaft in water-bearing sand layer, the safety incidents of water gush- ing, sand boil, collapse, etc, easily occur. In the paper, we studied the technology of high pressure jet-grouted pile and steel pipe combined arch, and introduced its technological principle. Though nu- merical computation, we analyzed the laws of surrounding rock deformation and stress variation re- spectively under the supporting technology with high pressure jet-grouted pile and steel pipe combined arch or without this technology. The results show that the technology of high pressure jet-grouted pile and steel pipe combined arch can effectively control the deformation and failure of surrounding rock, and obtain a better supporting effect. The ventilating shaft safely and smoothly passed the wa- ter-bearing sand layer by using this technology in Weiqiang Coal Mine, and we got the expected re- sults. The technology can be widely applied.