Research on Construction Technology of Metro Shield Tunneling Under Existing Line in Short Distance
The traditional shield construction of subway tunnel will affect the existing line and cause the set-tlement and deformation of the project.A construction technology of subway shield tunneling under the existing line section at a short distance is designed to ensure the slope stability and reduce the adverse impact of construc-tion on the surrounding existing line.Through in-depth analysis of the risk points of undercrossing the existing metro section tunnel in a short distance,three risk points are obtained,namely,improper shield construction,improper management of shield tail clearance and improper control of soil disturbance.The framework of shield tunneling construction process is designed,the shield machine model is selected according to the actual situation of the project,and the construction parameters of undercrossing the existing line section tunnel in a short distance are calculated.When the shield undercrossing the existing line section tunnel,the construction protection meas-ures are designed.In order to verify the reliability and operability of the design and construction technology,an actual engineering example is used for analysis.The results show that under the design and construction technolo-gy,the ground settlement,track bed settlement,and tunnel lateral deformation values are within the control range,greatly improving the safety of the project.
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