盾构隧道始发井基坑土体加固设计分析

The research of soil reinforcement at shield tunnel starting well

结合某盾构隧道始发段地层加固工程实际,确定了合适的端头加固工法,利用FLAC3D有限差分方法,建模分析了不同加固范围时盾构掘进对周边环境及基坑支护结构的影响,获取最佳安全系数计算地层加固范围,为工程施工提供依据。

According to a practice engineering of soil reinforcement at shield tunnel starting well,since a appropriate construction method has been adopted,the FLAC3 D finite difference method was used to build a numerical model,analyzing the different effect on ground surface settlement and the horizontal displacement of retaining structure in terms of different reinforcement scope. Finally,the optimal safety factor and the best reinforcement scope were obtained through this way,so as to provide some reference for practice engineering.