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施工技术

土压平衡盾构脱困技术及经验教训

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  • (中铁隧道集团技术中心, 河南 洛阳 471009)
李辉(1981—),男,河北保定人,2008年毕业于石家庄铁道学院土木工程专业,本科,助理工程师,主要从事隧道与地下工程科研、设计与施工管理工作。

收稿日期: 2011-10-20

  修回日期: 2012-02-15

  网络出版日期: 2012-05-03

Technologies to Release Jammed Earth Pressure Balanced (EPB)  Shield and Its Lessons

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  • (Technology Center of China Railway Tunnel Group, Luoyang 471009, Henan, China)

Received date: 2011-10-20

  Revised date: 2012-02-15

  Online published: 2012-05-03

摘要

为解决土压平衡盾构通过硬岩地层时被卡死的难题,以重庆地铁6号线土压平衡盾构施工为例,施工中采取以下脱困措施: 1)采用爆破方法破除盾体上方围岩使盾构脱困; 2)采用抬高刀具和增大开挖直径的方法解决边滚刀磨损超限造成盾体被卡的问题; 3)爆破脱困后,对爆破形成的空腔进行注浆回填,保证盾构施工安全。针对盾构卡机问题,提出以下防卡措施: 1)盾构在硬岩条件下施工,给盾构机配备扩挖刀; 2)定期对刀盘情况进行检查。

本文引用格式

李辉,刘银涛 . 土压平衡盾构脱困技术及经验教训[J]. 隧道建设, 2012 , 32(2) : 239 -244 . DOI: 10.3973/j.issn.1672-741X.2012.02.022

Abstract

An EPB shield used in the construction of No. 6 line of Chongqing Metro was jammed when boring in hard rocks. Technologies, including removing the rock mass above the shield by means of blasting, extending the cutting tools and enlarging the excavation diameter, and backfill grouting for the voids created by blasting, are adopted to release the jammed shield. Recommendations, such as TBMs with copy cutters should be used in hard rock conditions and regular inspection should be made on the cutter heads, are proposed to avoid shield jamming.
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