PDF《重庆市朝天门两江隧道越江段盾构法 合理覆盖层厚度研究》

第26 卷第6期岩石力学与工程学报 Vol.

26 No.6

2007 年6月Chinese Journal of Rock Mechanics and Engineering June,2007 收稿日期:2006C08C28;

修回日期:2006C10C23 基金项目:国家自然科学基金资助项目(50309017);

重庆市科学技术委员会资助项目 作者简介:蒋树屏(1951C),男,博士,1978 年毕业于重庆建筑工程学院港湾工程专业,现任研究员,主要从事与公路隧道和地下工程等方面的研究 工作.E-mail:jiangshuping@ccrdi.cmhk.com 重庆市朝天门两江隧道越江段盾构法 合理覆盖层厚度研究 蒋树屏

1 ,刘元雪 1,2 ,谢锋3,王培勇

2 (1. 重庆交通科研设计院,重庆 400067;

2. 后勤工程学院 建筑工程系,重庆 400041;

3. 重庆交通大学 土木建筑学院,重庆 400074) 摘要:江底隧道的覆盖层厚度十分重要.一方面,如果覆盖层厚度太小,江底隧道工作面就有面临严重的失稳问 题和江水涌入的危险,会使辅助工法的投入增大.另一方面,覆盖层厚度太大将增加江底隧道的长度、坡度与造 价.首先将重庆朝天门两江隧道与国内外一些知名海底隧道进行比较,得出其在盾构施工方法下的覆盖层厚度建 议.然后根据公路隧道施工技术规范,提出标准隧道新概念.结合重庆朝天门两江隧道的工程实际情况,分别比 较在不同覆盖厚度下朝天门两江隧道与标准隧道拱顶位移和主拉应力,最后得出该隧道的合理覆盖层厚度. 关键词:隧道工程;

水下隧道;

覆盖层厚度;

工程类比法;

数值模拟 中图分类号:U

45 文献标识码:A 文章编号:1000C6915(2007)06C1188C06 STUDY ON REASONABLE COVER THICKNESS FOR SUBMARINE TUNNEL OF CHAOTIANMEN IN CHONGQING BY SHIELD CONSTRUCTION JIANG Shuping1 ,LIU Yuanxue1,2 ,XIE Feng3 ,WANG Peiyong2 (1. Chongqing Communications Research and Design Institute,Chongqing 400067,China;

2. Department of Architecture and Civil Engineering,Logistical Engineering University of PLA,Chongqing 400041,China;

3. College of Civil Engineering and Architecture,Chongqing Jiaotong University,Chongqing 400074,China) Abstract:The determination of the cover thickness of the submarine tunnel is very important,because it will be very dangerous if the cover thickness is too small,whereas the length,slope gradient and cost will be increased after a larger cover thickness is chosen. At first,the reasonable cover thickness for submarine tunnel of Chaotianmen in Chongqing is proposed by comparing this tunnel with some domestic and foreign well-known submarine tunnels. According to the Technical Specification for Construction of Highway Tunnel,a new concept of standard tunnel is put forward. Based on the actual situation of Chongqing Chaotianmen tunnel,by comparing the crown displacement and the principal tensile stress of standard tunnel and this tunnel in different cover thicknesses,the reasonable cover thickness is finally put forward. Key words:tunnelling engineering;

submarine tunnel;

cover thickness;

engineering analogism;

numerical simulation 第26 卷第6期蒋树屏,等. 重庆市朝天门两江隧道越江段盾构法合理覆盖层厚度研究 ?

1189 ?

1 引言水下隧道处于水的包围之中,由于孔隙水压力 降低了隧道围岩的有效应力,从而使得地层的成拱 效应降低.如果覆盖层厚度过薄,隧道在施工时就 会发生塌方、泥石流和涌水事故的发生.这不仅影 响隧道的稳定性,还会严重影响隧道的工期.在丹 麦海峡海底隧道修建过程中,海水冲破了隧道