Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum
With the rapid advancement of urban underground space development, shield tunnel construction has seen a significant increase. However, at the initial launching stage of shield tunnels in shallow-buried weak strata, engineering risks such as face instability and sudden surface settlement frequently...
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2025-07-01
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| author | Jia Zhang Xiankai Bao |
| author_facet | Jia Zhang Xiankai Bao |
| author_sort | Jia Zhang |
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| description | With the rapid advancement of urban underground space development, shield tunnel construction has seen a significant increase. However, at the initial launching stage of shield tunnels in shallow-buried weak strata, engineering risks such as face instability and sudden surface settlement frequently occur. At present, there are relatively few studies on the reinforcement technology of the initial section of shield tunnel in shallow soft ground and the evolution law of ground disturbance. This study takes the launching section of the Guanggang New City depot access tunnel on Guangzhou Metro Line 10 as the engineering background. By applying MIDAS/GTS numerical simulation, settlement monitoring, and theoretical analysis, the reinforcement technology at the tunnel face, the spatiotemporal evolution of ground settlement, and the mechanism of soil disturbance transmission during the launching process in muddy soil layer are revealed. The results show that: (1) the reinforcement scheme combining replacement filling, high-pressure jet grouting piles, and soil overburden counterpressure significantly improves surface settlement control. The primary influence zone is concentrated directly above the shield machine and in the forward excavation area. (2) When the shield machine reaches the junction between the reinforced and unreinforced zones, a large settlement area forms, with the maximum ground settlement reaching −26.94 mm. During excavation in the unreinforced zone, ground deformation mainly occurs beneath the rear reinforced section, with subsidence at the crown and uplift at the invert. (3) The transverse settlement trough exhibits a typical Gaussian distribution and the discrepancy between the measured maximum settlement and the numerical and theoretical values is only 3.33% and 1.76%, respectively. (4) The longitudinal settlement follows a trend of initial increase, subsequent decrease, and gradual stabilization, reaching a maximum when the excavation passes directly beneath the monitoring point. The findings can provide theoretical reference and engineering guidance for similar projects. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-07-01 |
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| spelling | doaj-art-bee9724c10dd4ea1b7a9aa20e009a15c2025-08-20T03:32:12ZengMDPI AGApplied Sciences2076-34172025-07-011514765710.3390/app15147657Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt StratumJia Zhang0Xiankai Bao1China Railway 20th Bureau Group Southern Engineering Co., Ltd., Guangzhou 511300, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaWith the rapid advancement of urban underground space development, shield tunnel construction has seen a significant increase. However, at the initial launching stage of shield tunnels in shallow-buried weak strata, engineering risks such as face instability and sudden surface settlement frequently occur. At present, there are relatively few studies on the reinforcement technology of the initial section of shield tunnel in shallow soft ground and the evolution law of ground disturbance. This study takes the launching section of the Guanggang New City depot access tunnel on Guangzhou Metro Line 10 as the engineering background. By applying MIDAS/GTS numerical simulation, settlement monitoring, and theoretical analysis, the reinforcement technology at the tunnel face, the spatiotemporal evolution of ground settlement, and the mechanism of soil disturbance transmission during the launching process in muddy soil layer are revealed. The results show that: (1) the reinforcement scheme combining replacement filling, high-pressure jet grouting piles, and soil overburden counterpressure significantly improves surface settlement control. The primary influence zone is concentrated directly above the shield machine and in the forward excavation area. (2) When the shield machine reaches the junction between the reinforced and unreinforced zones, a large settlement area forms, with the maximum ground settlement reaching −26.94 mm. During excavation in the unreinforced zone, ground deformation mainly occurs beneath the rear reinforced section, with subsidence at the crown and uplift at the invert. (3) The transverse settlement trough exhibits a typical Gaussian distribution and the discrepancy between the measured maximum settlement and the numerical and theoretical values is only 3.33% and 1.76%, respectively. (4) The longitudinal settlement follows a trend of initial increase, subsequent decrease, and gradual stabilization, reaching a maximum when the excavation passes directly beneath the monitoring point. The findings can provide theoretical reference and engineering guidance for similar projects.https://www.mdpi.com/2076-3417/15/14/7657shallow-buried muddy soil layershield tunneltunnel face reinforcementground deformation |
| spellingShingle | Jia Zhang Xiankai Bao Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum Applied Sciences shallow-buried muddy soil layer shield tunnel tunnel face reinforcement ground deformation |
| title | Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum |
| title_full | Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum |
| title_fullStr | Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum |
| title_full_unstemmed | Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum |
| title_short | Study on Reinforcement Technology of Shield Tunnel End and Ground Deformation Law in Shallow Buried Silt Stratum |
| title_sort | study on reinforcement technology of shield tunnel end and ground deformation law in shallow buried silt stratum |
| topic | shallow-buried muddy soil layer shield tunnel tunnel face reinforcement ground deformation |
| url | https://www.mdpi.com/2076-3417/15/14/7657 |
| work_keys_str_mv | AT jiazhang studyonreinforcementtechnologyofshieldtunnelendandgrounddeformationlawinshallowburiedsiltstratum AT xiankaibao studyonreinforcementtechnologyofshieldtunnelendandgrounddeformationlawinshallowburiedsiltstratum |