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

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 th...

Full description

Saved in:
Bibliographic Details
Published inJournal of Zhejiang University. A. Science Vol. 13; no. 11; pp. 858 - 869
Main Authors He, Chuan, Feng, Kun, Fang, Yong, Jiang, Ying-chao
Format Journal Article
LanguageEnglish
Published Heidelberg SP Zhejiang University Press 01.11.2012
Subjects
Civil Engineering
Classical and Continuum Physics
Construction
Engineering
Grounds
Industrial Chemistry/Chemical Engineering
Mechanical Engineering
Metros
Settlements
Shields
Strata
Subway tunnels
Subways
Tunneling
地表变形
地表沉降
地铁1号线
平行隧道
沉降曲线
盾构隧道施工
砂卵石地层
离散单元法
Ground loss
Field test
Twin-parallel shield tunneling
U45
Discrete element method (DEM)
Surface settlement
Model test
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography: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,（1MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China）（2School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China）
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.
33-1236/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A12ISGT6