A Study of the Segment Assembly Error and Quality Control Standard of Special-Shaped Shield Tunnels

Peinan Li, Zeyu Dai, Xi Wang, Jun Liu, Yi Rui, Xiaojun Li, Jie Fan and Peixin Chen
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Peinan Li: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Zeyu Dai: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Xi Wang: College of Civil Engineering, Tongji University, Shanghai 200092, China
Jun Liu: College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China
Yi Rui: College of Civil Engineering, Tongji University, Shanghai 200092, China
Xiaojun Li: College of Civil Engineering, Tongji University, Shanghai 200092, China
Jie Fan: Shanghai Tunnel Engineering Co., Ltd., Shanghai 200032, China
Peixin Chen: Shanghai Tunnel Engineering Co., Ltd., Shanghai 200032, China

Energies, 2022, vol. 15, issue 7, 1-30

Abstract: Large-section special-shaped shield tunnels feature many advantages, such as versatility and a large space utilization rate in energy transmission and public transport; however, guaranteeing the quality of segments’ assembly is difficult. Based on the quasi-rectangular shield tunnel project of Hangzhou Line 9 in China, this study investigated the formation mechanism and control measures of lining segment assembly defects. By quantifying the manufacturing error and positioning error, a simulation program for segment assembly is developed to calculate the error. Furthermore, considering the relative accumulative error between the upper and lower T blocks, the finite element model of key blocks (T-LZ block) is established to perform mechanical analysis, based on which the relative error control standard of the key block under the corresponding working conditions is proposed. The results show that the assembly quality can be effectively improved by assembling the LZ block first and applying corresponding error control measures, and the displacement of the segment along the rZ direction should be carefully controlled during the construction. The error caused by normal assembly will not damage the LZ block, and the corresponding control standard under the action of multi-degree-of-freedom error (extreme case) is 9.8 mm. Using this method to predict the assembly quality of segments can provide a basis for actual construction control of segment assembly.

Keywords: quasi-rectangular shield tunnel; lining segments; assembly quality; error analysis; control standard (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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