Application of Threebench Sevenstep Excavation Method in Tunnels  with Large Crosssection, Shallow Cover and Asymmetricallyloaded  Soft and Weak Surrounding Rocks

TIAN Jia; LIU Jun; WANG Gaipeng

doi:10.3973/j.issn.1672-741X.2012.z1.018

2012 , Vol. 32 >Issue 增刊1: 85 - 89

DOI: https://doi.org/10.3973/j.issn.1672-741X.2012.z1.018

Application of Threebench Sevenstep Excavation Method in Tunnels  with Large Crosssection, Shallow Cover and Asymmetricallyloaded  Soft and Weak Surrounding Rocks

TIAN Jia ,
LIU Jun ,
WANG Gaipeng

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(The Fifth Engineering Co., Ltd. of China Railway First Group, Baoji 721006, Shaanxi, China)

Received date: 2012-09-28

Revised date: 2012-10-20

Online published: 2013-02-19

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Abstract

Threebench sevenstep excavation method is adopted in the Anyuan tunnel, Fenghuangshan tunnel, Fandunping tunnel and Jiutaishan tunnel with shallow cover and asymmetricallyloaded soft and weak surrounding rocks, on basis of investigation and analysis on construction technologies of shallowcovered tunnel with asymmetricallyloaded soft and weak surrounding rocks in China. The construction difficulties, key construction technologies and countermeasures of threebench sevenstep excavation method are presented. The paper can provide references for similar projects in the future.

Key words： tunnel; shallowcovered and asymmetricallyloaded; soft and weak surrounding rock; threebench sevenstep excavation method; unloading reinforcement; backpressure and backfilling

Cite this article

TIAN Jia , LIU Jun , WANG Gaipeng . Application of Threebench Sevenstep Excavation Method in Tunnels  with Large Crosssection, Shallow Cover and Asymmetricallyloaded  Soft and Weak Surrounding Rocks[J]. Tunnel Construction, 2012 , 32(增刊1) : 85 -89 . DOI: 10.3973/j.issn.1672-741X.2012.z1.018

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