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A Study on Optimization of Reinforcement Scheme for Adjacent Construction of Super-large Rectangular Pipe Jacking Shield Tunnel in Soft Ground
(1. School of Civil Engineering, North China University of Technology, Beijing 100144; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044; 3. China Railway Fourth Survey and Design Institute Group Co., Ltd., Wuhan 430064;4. Haixia (Fujian) Transportation Engineering Design Co., Ltd., Fuzhou 350004)
Abstract In order to ensure the safety of the adjacent construction of the super-large rectangular pipe jacking shield tunnel in the soft ground, taking a rectangular pipe jacking shield tunnel adjacently passing under the existing high-speed railway as a study case, the effects of different construction and reinforcement schemes of the superlarge rectangular pipe jacking shield tunnel adjacent to the high-speed railway section are studied. The results show that when advanced grouting is adopted, the active instability displacement can be reduced by 25.64%, the passive instability displacement can be reduced by 17.65%, and the track settlement can be reduced by 30.38% for the excavation face. And when the manually excavated pile + D-shaped steel auxiliary beam are adopted, the active instability displacement can be reduced by 51.28%, the passive instability displacement can be reduced by 29.41%, and the track settlement can be reduced by 42.31% for the excavation face. Field monitoring shows that the maximum settlement of the track after reinforcement by the manually excavated pile + D-shaped steel auxiliary beam is only 1.65 mm. The super-large rectangular pipe jacking shield tunnel has successfully passed under the existing highspeed railway. The manually excavated pile + D-shaped steel auxiliary beam ensure the adjacent construction safety of the super-large rectangular pipe jacking shield tunnel and the normal operation of the high-speed railway.
Abstract：
In order to ensure the safety of the adjacent construction of the super-large rectangular pipe jacking shield tunnel in the soft ground, taking a rectangular pipe jacking shield tunnel adjacently passing under the existing high-speed railway as a study case, the effects of different construction and reinforcement schemes of the superlarge rectangular pipe jacking shield tunnel adjacent to the high-speed railway section are studied. The results show that when advanced grouting is adopted, the active instability displacement can be reduced by 25.64%, the passive instability displacement can be reduced by 17.65%, and the track settlement can be reduced by 30.38% for the excavation face. And when the manually excavated pile + D-shaped steel auxiliary beam are adopted, the active instability displacement can be reduced by 51.28%, the passive instability displacement can be reduced by 29.41%, and the track settlement can be reduced by 42.31% for the excavation face. Field monitoring shows that the maximum settlement of the track after reinforcement by the manually excavated pile + D-shaped steel auxiliary beam is only 1.65 mm. The super-large rectangular pipe jacking shield tunnel has successfully passed under the existing highspeed railway. The manually excavated pile + D-shaped steel auxiliary beam ensure the adjacent construction safety of the super-large rectangular pipe jacking shield tunnel and the normal operation of the high-speed railway.
CUI Guangyao1 MA Jianfei2 NING Maoquan3,
4 TANG Zaixing3,
4 LIU Shunshui3 etc
.A Study on Optimization of Reinforcement Scheme for Adjacent Construction of Super-large Rectangular Pipe Jacking Shield Tunnel in Soft Ground[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 178-184
2023, Vol. 60 