Analysis of Constraction Monitoring for Shield Tunnel Undercrossing Existing Buildings
Based on the background of a shield tunneling project in Chengdu Rail Transit through the existing public security bureau,control measures for deep hole grouting and ground grouting rein-forcement inside the tunnel are proposed.And through numerical simulation methods,a three-dimen-sional geological structure model is established,and the full excavation process of the shield tunneling is simulated to analyze the stress characteristics of the strata and buildings.The research results indi-cate that the subsidence of the strata continues to increase during excavation,with the highest growth rate occurring when the excavation reaches below the building.During the underpass stage of excava-tion,the deformation of segments varies significantly.The settlement at both ends of the H-shaped building is relatively greater and reaches its maximum near the metro line.The tilting deformation of the building is most obvious when the excavation is directly below it.Combined with construction mo-nitoring data,the shield tunnel parameters should be adjusted in a timely manner during the excava-tion process to ensure that the settlement and deformation rate of the building meet the requirements of construction monitoring.
万方数据
维普
