Simulation analysis of surface subsidence during subway shield construction in upper soft and lower hard strata
To investigate the law of surface subsidence caused by shield tunneling in the upper soft and lower hard strata,based on the shield tunneling project of the subway section from Dalingshan East Station to Songs-han Lake Station,the influence of shield tunneling in the upper soft and lower hard strata and the comparison of surface settlement law in the hard stratum are analyzed through field measurement and numerical simulation.The results show that the lateral settlement of the ground during the excavation of single and double-line shield tunnels changes in a V-shaped and W-shaped pattern respectively.The range of influence on the deformation of the ground during shield tunnel excavation is about 40 meters,with the maximum settlement rate occurring within a range of 5 meters in front to 15 meters behind.The settlement of the ground gradually decreases with the increase of the geological hard layer ratio,and significant changes in settlement occur when the hard layer ratio is between 16.7％and 83.3％.The hard layer ratios of 83.3％and 16.7％can be considered as the up-per and lower limits for the study of upper soft and lower hard composite strata.
upper soft and lower hard stratashield methodhard layer ratiosurface subsidencesubway
万方数据
维普
