隧道斜井断层区高压注浆加固技术研究  

Research on High-Pressure Grouting Reinforcement Technology in the Fault Zone of a Tunnel Inclined Shaft

作　　者：龚雄文 GONG Xiongwen(China Railway 12th Bureau Group 4th Engineering Co.Ltd.,Xi'an Shaanxi 710021,China)

机构地区：[1]中铁十二局集团第四工程有限公司,陕西西安710021

出　　处：《铁道建筑技术》2025年第4期146-150,共5页Railway Construction Technology

基　　金：中铁十二局集团有限公司科技研发计划项目(2020-25)。

摘　　要：鸡心岭隧道斜井位于压扭性断层区域,面临高水压和岩体破碎等复杂地质条件。通过现场分析、数值模拟以及工程实践,提出注浆压力、浆液配比与注浆层厚度的协同作用机制。研究结果表明,注浆压力应控制在12~14 MPa,浆液配比W/C=1可确保良好的扩散性和加固效果,注浆半径可达到1.1 m,注浆范围应包括开挖轮廓外7 m;采用前进式分段注浆与钻杆后退式注浆相结合的手段,能够有效避免浆液回流并提高注浆压力,确保浆液能够深入围岩裂隙。The inclined shaft of Jixinling Tunnel is located in a compressional-shear fault zone,facing complex geological conditions including high water pressure and fractured rock masses.Through systematic research combining field analysis,numerical simulation,and engineering practice,this study reveals the synergistic mechanism of grouting pressure,slurry mix ratio,and grouting layer thickness.The results demonstrate that:the grouting pressure should be controlled at 12-14 MPa.A slurry mix ratio(W/C=1)ensures optimal diffusion performance and reinforcement effectiveness,achieving a grouting radius of 1.1 m.The grouting range should extend 7 m beyond the excavation contour.The combined application of stepwise forward grouting and drill rod retraction grouting effectively prevents slurry backflow,increases grouting pressure,and ensures deep penetration of slurry into surrounding rock fractures.

关 键 词：隧道工程 断层 高压注浆加固 数值模拟 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]