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为确定水平旋喷加固地铁盾构进出洞口的效果,给设计、施工提供理论依据和指导,对上海某地铁盾构进出洞口水平旋喷加固工程,利用强度折减有限元法进行了三维数值模拟。通过三种加固工况分析了土体的稳定性、安全性以及地表和加固体的变形规律,并对各工况进行比较分析,得出了盾构进出洞口较为经济、合理的水平旋喷加固范围。另外,还对加固体参数变化引起的地表位移、洞圈加固体位移以及安全系数的变化进行了对比分析。
In order to determine the effect of horizontal jet-jetting to shield the entrance and exit of the subway shield, provide theoretical basis and guidance for the design and construction of the subway shield, and carry out a three-dimensional numerical simulation of the rotary jet grouting project of a subway shield tunnel in Shanghai through strength reduction finite element method . The stability and safety of the soil and the deformation of the surface and the reinforcement were analyzed by three kinds of reinforcement conditions. The comparative analysis of the conditions was made. The results showed that the shield was more economical and reasonable at the entry and exit of the hole. range. In addition, the change of the surface displacement due to the change of the reinforcement parameters, the displacement of the hole and the reinforcement and the change of the safety factor are also analyzed.