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Author:

Li, Pengfei (Li, Pengfei.) (Scholars:李鹏飞) | Zhao, Yong (Zhao, Yong.) | Zhou, Xiaojun (Zhou, Xiaojun.)

Indexed by:

EI Scopus SCIE

Abstract:

The sequential excavation method (SEM), in which the tunnel face is partitioned into several temporary drifts, can promote face stability and reduce ground displacement. Three-bench seven-step excavation method (TSEM) as a kind of the SEM, which can stabilize the tunnel face but does not require any additional support, has been widely used in loess tunnels with large cross-sections for high-speed railway (HSR) in China. This study focuses on the effects of TSEM on the displacement characteristics for HSR tunnels in loess ground. A series of in-situ tests and numerical simulations were conducted to reveal displacement characteristics and obtain optimal construction approaches for large-span loess tunnels in China. The strata around the loess tunnels have undergone significant settlement either at the arch part or at the ground surface due to loess's metastable structure especially in the new loess ground. Upper strata above loess tunnels subsided as a whole, and the subsidence developed suddenly and devastatingly. Large residual ground surface settlements still occurred after the ring closure of the primary support even after the application of the upper lining. The best construction approach of TSEM was proposed for its potential to limit surface and subsurface ground displacements, as revealed both by numerical simulation and field monitoring. (C) 2015 Elsevier Ltd. All rights reserved.

Keyword:

Loess ground Surface settlement Arch settlement Three-bench seven-step excavation method Numerical simulation

Author Community:

  • [ 1 ] [Li, Pengfei]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Li, Pengfei]Southwest Jiaotong Univ, Minist Educ, Key Lab Transportat Tunnel Engn, Chengdu 610000, Sichuan, Peoples R China
  • [ 3 ] [Zhou, Xiaojun]Southwest Jiaotong Univ, Minist Educ, Key Lab Transportat Tunnel Engn, Chengdu 610000, Sichuan, Peoples R China
  • [ 4 ] [Zhao, Yong]Minist Railways, Engn Design & Appraisal Ctr, Beijing 100844, Peoples R China

Reprint Author's Address:

  • 李鹏飞

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

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Source :

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

ISSN: 0886-7798

Year: 2016

Volume: 51

Page: 41-55

6 . 9 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:166

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 122

SCOPUS Cited Count: 143

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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