Shield tunneling analysis and measures under elevated high-speed railway

摘要

With the development of rail transit in China more and more shield tunnels have to be constructedrnunder or nearby high-speed railway lines in metropolis. As a result two principal problems arise: (1) sincernrequirements of the running safety of high-speed trains and criteria of the riding comfort of passengers arernquite strict, it is difficult to construct shield tunnels beneath high-speed railway lines, and (2) the influencernof the load of railway lines on the tunnel construction should be considered. Consequently, treatments of thernrailway foundation are usually implemented during the tunnel construction to protect the high-speed railwayrnline. In order to determine whether the treatments are actually necessary, numerical simulations based on twornreal construction cases are taken to evaluate the interactive influence. In site experiments have been employedrnto validate the calculation. According to the calculation and experiment results recommendations are given inrndifferent situations.