Research on risk control of large-scale foundation pit excavation above shallow buried metro tunnel
In the process of urban construction,the rapid development of the metro has certain limitations on the development of urban land parcels and the utilization of underground space,especially when the new construction project inevitably crosses or is close to the existing operating metro lines,which will greatly increase the complexity and risk of engineering construction.Based on this,this article conducts research against the risk and control measures of large-scale foundation pit excavation above shallow buried metro tunnels.As the pipe curtain method is characterized by convenient construction,small disturbance effects,and adaptation to narrow space operation.The pipe curtain anti-floating system could be used to control structural uplift after excavation and unloading of the pit above the shallow metro tunnel to protect the safety of the operating metro.The article analyzes the combined application of the MJS method and pipe curtain method through finite element numerical simulation,and the study shows that the pipe curtain anti-floating system could reduce the disturbance effect of the upper span project on the tunnel below.The relevant research results could provide reference and an example to build on for the control of construction risks of similar engineering projects.
metro tunnelpipe curtain methodfoundation pit excavationnumerical simulationdeformation control
NETL
NSTL
万方数据
维普
