Influence of strata pre-reinforcement on the tunnel and the surrounding strata while shield tunnel crosses beneath intercity high-speed rail

摘要

In view of that the construction period of shield crossing beneath high-speed rail is apt to cause soil deformation and large differential settlement of ballastless track plate and of the long-term implications on the tunnel structure of the train cycle dynamic load in operating period, with the project of shield crossing intercity in Suzhou as example, the paper determines pre-reinforcement method before crossing project, applies numerical simulation to analyze the influence of pre-reinforcement on the tunnel itself and surrounding strata, then derives the rule of pre-reinforcement on reducing soil deformation and tunnel internal force. The research gives that grouting in main and secondary reinforcement area will apparently reduce settlement deformation, jet grouting pile controls surface deformation well and soil pre-reinforcement will reduce a lot of shield tunnel segment internal force caused by high-speed rail operation.