Evaluation of Soil Structure Characteristics of Wenzhou Soft Clay and Analysis of Tunnelling Disturbance with Tunnel Boring Machines

LU Sheng'an; WANG Wei; XIAO Li

doi:10.13204/j.gyjzG23051908

Volume 53 Issue 11

Nov. 2023

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LU Sheng'an, WANG Wei, XIAO Li. Evaluation of Soil Structure Characteristics of Wenzhou Soft Clay and Analysis of Tunnelling Disturbance with Tunnel Boring Machines[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(11): 1-10,20. doi: 10.13204/j.gyjzG23051908

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Evaluation of Soil Structure Characteristics of Wenzhou Soft Clay and Analysis of Tunnelling Disturbance with Tunnel Boring Machines

doi: 10.13204/j.gyjzG23051908

1. Wenzhou Rail and Transit Investment Group Co., Ltd., Wenzhou 325003, China;
2. Zhejiang University Research Center of Coastal and Urban Geotechnical Engineering, Hangzhou 310058, China

Received Date: 2023-05-19

Abstract

Abstract

Wenzhou has deep structural soft soil. To study the deformation of soft soil during metro tunnel construction, a typical section of the soil layer in Wenzhou Rail Transit Line M1 was taken as the research object. Based on the inherent compression characteristics of remolded soil, consolidation compression tests were conducted on intact and remolded specimens, to evaluate structure characteristics respectively from strength and deformation. Simultaneously, a three-dimensional elastic-plastic finite element model for the stratum and the shield tunnel was constructed by the software of PLAXIS 3D, to study the disturbance laws, the distribution of disturbance degrees, the additional settlement of the structural soil layer tunnelled with tunnel boring machines. The results indicated that the soft clay in the Wenzhou area was of strong structure, and the strength and deformation characteristics were influenced by the structure. The yield stress could not be used as an index to evaluate the structure of under-consolidated soil. The construction disturbance could be divided into the preliminary development stage, the rapid development stage and the stable stage, and different stages were influenced by different disturbance factors. The tunnelling with tunnel boring machines would caused larger additional settlement of strata after construction, which mainly concentrated in the soil around shield tunnels. Therefore, it was necessary to reinforce the stratum before construction.

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References

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