富水松软地层浅埋暗挖隧道MJS预加固支护技术研究

以杭州市某隧道南口浅埋暗挖段工程为依托,分析进洞30 m段浅埋暗挖施工出现的变形沉降大的不利因素,提出MJS超前预加固支护技术对于改良隧道周围土体力学特性的新思路。通过数值模拟分析MJS超前预加固法对隧道位移、受力的影响,并研究加固参数的敏感性,对土体进行MJS加固改造应用,沉降变形得到改善和提高。

Study on MJS Pre-reinforcement Supporting Technology of Shallow-buried Excavated Tunnel in Water-rich Loose Stratum

Based on a shallow-buried excavated section project at the south entrance of a tunnel in Hangzhou,the adverse factors of large deformation and settlement appeared in the shallow-buried excavation construction of entrance 30-m section are analyzed.The new thinking of the MJS pre-reinforcement supporting technology to improve the mechanical properties of the soil body surrounding the tunnel is proposed.The influence of MJS pre-reinforcement method on the displacement and stress of the tunnel is analyzed through the numerical simulation.And the sensitivity of reinforcement parameters is studied.MJS reinforcement and reconstruction of soil body are applied.The settlement and deformation are improved.