Analysis on Surface Settlement of Pipe Jacking Method for Constrution of Contact Channel in Water-rich Silty Fine Sand Layer

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Analysis on Surface Settlement of Pipe Jacking Method for Constrution of Contact Channel in Water-rich Silty Fine Sand Layer

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[1]LI Xiaolong,LI Pengchao,LIU Xiaofeng,et al.Analysis on Surface Settlement of Pipe Jacking Method for Constrution of Contact Channel in Water-rich Silty Fine Sand Layer[J].Journal of Zhengzhou University (Engineering Science),2024,45(pre):2-.[doi:10. 13705 / j. issn. 1671-6833. 2025. 01. 009]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 pre Page number: 2- Column: Public date: 2024-12-31

Title:: Analysis on Surface Settlement of Pipe Jacking Method for Constrution of Contact Channel in Water-rich Silty Fine Sand Layer

Author(s):: LI Xiaolong; LI Pengchao; LIU Xiaofeng; SUN Lijun; GUO Changlong; HE Kuang; (1. School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China 2. China Railway 14th Bureau Group Corporation Limited, Jinan 250101, China 3. Zhengzhou Metro Group Corporation Limited, Zhengzhou 450000, China)

Keywords:: Contact channel; Mechanical pipe jacking method; Numerical simulation; Field monitoring; Surface settlement

CLC:: U 231.3

DOI:: 10. 13705 / j. issn. 1671-6833. 2025. 01. 009

Abstract:: In order to study the influence of pipe jacking method on stratum settlement of subway contact channel in water-rich silty sand layer, the ground settlement of contact channel with 15 m depth and 7.5 m length in 08 work area of Zhengzhou Metro Line 12 during pipe jacking construction was monitored, and the spatial and temporal evolution law of ground settlement during pipe jacking construction was analyzed in combination with 3-D numerical simulation of "stratum-main tunnel-inner support- contact channel " system. The ground settlement increases gradually with the pushing of pipe jacking machine, and reaches the maximum settlement value after pushing in place, in which the settlement increment produced in the stage of trolley positioning, starting hole breaking and receiving hole breaking is obviously larger than that in other excavation stages. After the equipment is dismantled, the stratum will rebound a certain amount due to unloading effect, and the settlement value will decrease. The surface settlement curve is funnel-shaped, symmetrical along the direction perpendicular to the center line of the contact channel, asymmetrical along the direction parallel to the center line, and the maximum settlement value is located 3 m away from the center of the contact channel and close to the starting end in the longitudinal direction. The horizontal influence range of the contact channel pipe jacking method on the surface is larger, and the concentrated area of the surface settlement is approximately elliptical, and its long axis is perpendicular to the axis of the contact channel

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Last Update: 2024-10-08