圆梁山隧道2#溶洞注浆技术研究

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Abstract The total length of Yuanliangshan tunnel is 11 068 m，which is the longest tunnel in Yuhuai railway line. It is excavated through Maoba syncline，Lengshui river shallow imbedding section and Tongmaling anticline. The stratum is mainly composed of mudstone，limestone and dolomite. According to the design，the maximum water yield reaches 8.3×104 m3/d，the highest water pressure is over 4.6 MPa. The karst cave is filled with high pressure water，fine silty sand and soft mud，so in the course of construction， water gushing and sand outburst are very serious at the excavation face，and the construction is very difficult. The paper principally introduces the conditions of water gushing，sand and mud outburst，and studies the grouting design，materials and machine and equipment.

Key words： tunneling engineering high water pressure fine silty sand karst cave grouting

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https://rockmech.whrsm.ac.cn/EN/Y2004/V23/IS2/5158