管幕冻结法浅埋大断面隧道开挖方案对衬砌性态及地层位移的影响

张冬梅; 张博恺; 刘志刚

doi:10.3973/j.issn.1672-741X.2015.11.002

隧道建设 >

2015 , Vol. 35 >Issue 11: 1121 - 1126

DOI: https://doi.org/10.3973/j.issn.1672-741X.2015.11.002

研究与探索

管幕冻结法浅埋大断面隧道开挖方案对衬砌性态及地层位移的影响

张冬梅 ,
张博恺 ,
刘志刚

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（1. 同济大学岩土及地下工程教育部重点实验室，上海 200092； 2. 同济大学土木工程学院地下建筑与工程系，上海 200092； 3. 港珠澳大桥珠海连接线管理中心，广东珠海 519030）

张冬梅（1975—），女，山东菏泽人，2003年毕业于同济大学,结构工程专业,博士,教授，主要从事软土盾构隧道施工与环境相互影响、运营隧道的长期性态研究工作。

收稿日期: 2015-08-06

修回日期: 2015-09-09

网络出版日期: 2015-11-25

基金资助

交通运输部建设科技项目（2013318J11300-3）

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Impact of Excavation Procedures of Shallow Large Crosssection Tunnel with Piperoofing and Frozen Soil on Tunnel Behavior and Ground Movement

ZHANG Dongmei ,
ZHANG Bokai ,
LIU Zhigang

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(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University,  Shanghai 200092, China; 2. College of Civil Engineering, Department of Geotechnical Engineering, Tongji  University, Shanghai 200092, China; 3. The Management Center of Zhuhai Link Road of Hong KongZhuhaiMacao Bridge, Zhuhai 519030, Guangdong, China)

Received date: 2015-08-06

Revised date: 2015-09-09

Online published: 2015-11-25

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摘要

经验表明，在软土、浅埋大断面隧道开挖方案中，加固方式对衬砌结构受力、隧道收敛变形和地层位移影响显著。港珠澳大桥珠海连接线拱北隧道具有隧道埋深浅、结构断面尺寸大、地质条件差、地理位置政治敏感性强等特点。以该隧道为背景，利用数值模拟方法，分析大直径钢管管幕冻结法施工和隧道开挖方案对衬砌结构受力和地层变形的影响。经分析发现：不同开挖方案对衬砌受力、变形和地层位移的影响显著；在分台阶开挖过程中，台阶越小，引起的衬砌受力、隧道收敛变形和地层位移越小；管幕冻结对改善衬砌受力和地层位移效果显著，根据管幕冻土受力特性对其关键受力部位提出建议。

关键词： 有限元分析; 浅埋大断面隧道开挖方案; 管幕冻土圈支护; 隧道性态; 隧道地层位移; 土体塑性区

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张冬梅 , 张博恺 , 刘志刚 . 管幕冻结法浅埋大断面隧道开挖方案对衬砌性态及地层位移的影响[J]. 隧道建设, 2015 , 35(11) : 1121 -1126 . DOI: 10.3973/j.issn.1672-741X.2015.11.002

Abstract

The tunnel excavation using mining method affects the tunnel behavior and ground movement significantly. Gongbei connection line of Hong KongZhuhaiMacao Bridge is a shallow large crosssection tunnel, with poor soil quality and high political sensitivity. In the paper, four potential excavation procedures are studied for the tunnel using FEM. The numerical results indicate that the excavation procedure has significant effect on the lining force, tunnel convergence and ground movement. The ground improvement using pipe roofing and frozen soil supporting is also investigated. The effect of ground improvement is then checked in terms of the tunnel lining force and tunnel convergence. It is found that the ground improvement can reduce the lining force and ground movement significantly.

Key words： FEM analysis; excavation procedure of shallow large crosssection tunnel; piperoofing and frozen soil; tunnel behavior; ground displacement; soil plastic zone

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