Calculation Method of Surface Settlement of Urban Road Subjected to Shield Tunneling
With the continuous urbanization in China,the development and utilization of underground space have attracted much attention,and shield tunnel has especially become a popular means of technical building.Due to the complex urban underground environment,municipal tunnels underpassing existing highways have been commonly observed.It is a vital issue for the safety evaluation of underground space to examine the prediction methods for the corresponding soil displacement.This work developed associated boundary conditions with the help of the plane model for thin-walled cylinders in elastic mechanics,and the determined the settlement and deformation calculation method for shallow buried circular cross-section soil with heavy stratum.The proposed technology was validated based on a shield tunnel project of pure steel fiber concrete that underpassed the You-Yi Avenida in Macau.The technology was also compared with stochastic medium theory with distinct convergence modes.Results reveal that the theoretical formulations are in good agreement with the measured soil displacements,and they are slightly better than the results of stochastic medium theory.The theoretical formulas comprehensively consider the influence of soil parameters,tunnel depth-to-diameter ratio,and construction level,and the calculation results are reasonable and reliable,which provides important theoretical support for the prediction of soil displacement induced by the construction of shield tunnels.
pure steel fiber concrete segmentground surface settlementground losssafety assessment
万方数据
维普
