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On-line Access: 2012-10-25

Received: 2012-09-27

Revision Accepted: 2012-10-10

Crosschecked: 2012-09-27

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.11 P.858-869

http://doi.org/10.1631/jzus.A12ISGT6


Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata


Author(s):  Chuan He, Kun Feng, Yong Fang, Ying-chao Jiang

Affiliation(s):  MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   chuanhe21@163.com

Key Words:  Twin-parallel shield tunneling, Surface settlement, Ground loss, Field test, Discrete element method (DEM), Model test


Chuan He, Kun Feng, Yong Fang, Ying-chao Jiang. Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata[J]. Journal of Zhejiang University Science A, 2012, 13(11): 858-869.

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author="Chuan He, Kun Feng, Yong Fang, Ying-chao Jiang",
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%T Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata
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%A Kun Feng
%A Yong Fang
%A Ying-chao Jiang
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A12ISGT6

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T1 - Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata
A1 - Chuan He
A1 - Kun Feng
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A1 - Ying-chao Jiang
J0 - Journal of Zhejiang University Science A
VL - 13
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EP - 869
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A12ISGT6


Abstract: 
City metro tunnels are usually constructed as twin-parallel tunnels and their adjacent construction may lead to surface deformation, affecting the surface environment and the safety of the tunnels. Due to its strong dispersion, sandy cobble strata can be easily disturbed by shield tunneling. Based on the project of the Chengdu Metro Line 1, field and model tests were carried out to study the surface settlement caused by shield tunneling in sandy cobble strata by measuring surface settlement curves, ground loss ratios and construction influence zones. The discrete element method (DEM) was used to study the factors affecting the formation of ground arches in sandy cobble strata at the microscopic level. Results show that the shape of the surface settlement curve in sandy cobble strata is different from that in soft soil. The buried depth and clear spacing of the two tunnels had a significant impact on the formation of ground arches.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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