PDF《大断面海底隧道软弱地层 CRD 法施工稳定性 控制研究》

第26 卷增2岩石力学与工程学报 Vol.

26 Supp.2

2007 年12 月Chinese Journal of Rock Mechanics and Engineering Dec.,2007 收稿日期:2007C06C17;

修回日期:2007C07C19 作者简介:黄明琦(1976C),男,1999 年毕业于兰州铁道学院土木工程系建筑工程专业,现为博士研究生、工程师,主要从事城市地下工程、水底 隧道工程方面的研究工作.E-mail:[email protected] 大断面海底隧道软弱地层 CRD 法施工稳定性 控制研究 黄明琦 1,2 ,付贤伦

2 ,李云超

2 (1. 山东科技大学 土木建筑学院,山东 青岛 266510;

2. 中铁

22 局集团有限公司 厦门翔安海底隧道项目部,福建 厦门 361102) 摘要:结合厦门翔安海底隧道翔安端出口浅埋段地层软弱、稳定性差、施工难度大、初期支护严重变形等实际情 况,分析左线隧道在 V 级围岩地质条件下 CRD 法施工隧道变形产生的原因,结合实际监控量测数据对软弱地层 大断面海底隧道进行施工稳定性分析,对包括围岩特性、CRD 各部步距、初期支护各部自成环封闭时间和全断面 整体封闭成环时间、永久仰拱与掌子面之间距离、初期支护背后充填注浆与否等对拱顶沉降量的影响进行综合分 析,在此基础上提出控制变形的措施,归纳成功的施工措施和工艺,为类似工程施工提供经验. 关键词:隧道工程;

海底隧道;

软弱地层;

CRD 法;

稳定性控制 中图分类号:U

45 文献标识码:A 文章编号:1000C6915(2007)增2C3804C06 STUDY ON STABILITY CONTROL OF LARGE-SECTION SUBSEA TUNNELS IN WEAK STRATA BY CRD CONSTRUCTION METHOD HUANG Mingqi1,2 ,FU Xianlun2 ,LI Yunchao2 (1. College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266510, China;

2. Xiang′an Subsea Tunnel Project in Xiamen, China Railway 22th Bureau Group Co.,Ltd.,Xiamen,Fujian 361102,China) Abstract:Combined with the facts that the strata of the entrance at Xiang′an side of Xiamen Xiang′an subsea tunnel are weak and unstable,the excavation is difficult,and the preliminary lining deforms severely. The reason of the left tunnel deformation excavated by CRD method under the condition of surrounding rock of class V is analyzed. Based on the measuring data,the construction stability of the large-section subsea tunnel in weak strata is analyzed,including the characters of surrounding rock,the distance between each step of CRD working face, the time of each step of CRD first shoring finished,the time of the whole working face completed,the distance between the permanent inverted arch and the working face,and grouting behind preliminary support or not. Based on these,the measures controlling the deformation are put forward. Successful practice and techniques are summarized to provide experiences for similar engineering. Key words:tunneling engineering;

subsea tunnel;

weak strata;

CRD method;

stability control

1 引言翔安隧道出口段地处 V 级围岩,地层软弱,稳 定性差,施工难度大.隧道开挖断面高达

170 m2 , 可以选择的施工方法有双侧壁导坑法和 CRD 法,双 侧壁导坑法施工工序繁多、难度大、造价高、进度 慢,而且抗侧向变形能力不如 CRD 法,因此主洞 采用 CRD 法进行施工. CRD 法是日本在真米隧道建设中吸取欧洲 CD 法的经验,在东叶高速线习志野台隧道施工中,将原CD 法中先挖中壁一侧改为两侧交叉开挖、步步 第26 卷增2黄明琦,等. 大断面海底隧道软弱地层 CRD 法施工稳定性控制研究 ?