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Author:

Zheng, Hebin (Zheng, Hebin.) | Li, Pengfei (Li, Pengfei.) | Ma, Guowei (Ma, Guowei.)

Indexed by:

EI Scopus SCIE

Abstract:

The stability of the middle soil pillar (MSP) is considered to be a crucial factor in ensuring the safety during the construction of asymmetric parallel tunnels. In this paper, both geomechanical model tests and numerical analysis were carried out to investigate the mechanical characteristics of the MSP between asymmetrically closely-spaced parallel-tunnels. First, large-scale three-dimensional (3-D) geomechanical model tests were conducted to study the stress release laws and mechanical behaviors of the MSP during the excavation and overloading conditions. Then, a numerical model was implemented based on the physical model for verifying the MSP's stress response obtained from the model tests. Failure degree index (FDI) was put forward to evaluate the degree of disturbance to the MSP and to analyze its damage extent during tunnels excavation. Furthermore, the effect of construction parameters (i.e., support strength and excavation sequence) on the damage behaviors of the MSP were discussed by extended numerical analysis. The model tests results show that the stress was mainly released from the upper and lower ends of the middle pillar to lateral direction in sand ground. Both the horizontal stress release and horizontal stress release rate of the MSP increased along with the external applied loads. Meanwhile, the overloading process only increased the stress of surrounding soil, while the load-bearing pattern of the MSP was basically unchanged. In addition, the numerical results indicate that due to the differences in the cross-section dimensions and construction parameters (e.g., support strength and excavation sequence) of the closely-spaced parallel-tunnels, the final damage pattern of the MSP was asymmetrical.

Keyword:

Asymmetric parallel tunnels Failure degree index Geomechanical model test Middle soil pillar Numerical simulation

Author Community:

  • [ 1 ] [Zheng, Hebin]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Li, Pengfei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Ma, Guowei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Li, Pengfei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China

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Source :

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

ISSN: 0886-7798

Year: 2021

Volume: 108

6 . 9 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:87

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 80

SCOPUS Cited Count: 88

ESI Highly Cited Papers on the List: 12 Unfold All

  • 2023-3
  • 2023-1
  • 2022-11
  • 2022-9
  • 2022-7
  • 2022-5
  • 2022-3
  • 2022-3
  • 2022-3
  • 2022-1
  • 2021-11
  • 2021-9

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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