整体式中隔墙连拱隧道模型试验及现场监测

›› 2012, Vol. 33 ›› Issue (9): 2625-2631.

整体式中隔墙连拱隧道模型试验及现场监测

邱长林¹，刘彬¹，何林生²，冯守中³

1.天津大学建工学院，天津 300072；2.重庆交通科研设计院，重庆 400067；3.上海朗琪土木工程技术有限公司，上海 200437

收稿日期:2011-05-12 出版日期:2012-09-11 发布日期:2012-09-12
作者简介:邱长林，男，1973年生，博士，副教授，主要从事岩土工程方面的教学和研究工作

Model test and in-situ monitoring of double-arch tunnel with integrated middle wall

QIU Chang-lin¹, LIU Bin¹, HE Lin-sheng², FENG Shou-zhong³

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. Chongqing Communications Research and Design Institute, Chongqing 400067, China; 3. Shanghai Langqi Civil Engineering Technology Co., Ltd., Shanghai 200437, China

Received:2011-05-12 Online:2012-09-11 Published:2012-09-12

摘要/Abstract

摘要： 针对连拱隧道复杂的施工力学特性，结合实际工程，通过模型试验和现场监测分别研究了整体式中隔墙连拱隧道在中导正洞台阶法施工过程中的位移和中隔墙应力变化情况，并详细分析了各开挖步骤对其的影响。结果表明，对于整体式中隔墙连拱隧道，上台阶开挖对顶部位移和中隔墙应力的影响大于下台阶开挖产生的影响；隧道顶点位移-历时曲线总体形状呈S形，最大位移发生在后掘隧道的顶部。由于主洞的开挖将使中隔墙另一侧应力增加较大，而本侧应力增加较小甚至降低，因此，先掘隧道的开挖使中隔墙产生由先掘隧道侧向后掘隧道侧偏转的弯矩，而后掘隧道的开挖将使该弯矩值减小

关键词: 连拱隧道, 整体式中隔墙, 模型试验, 现场监测, 位移, 中隔墙应力

Abstract: In order to study the complex characteristics of double-arch tunnel during excavation, model and in-situ monitoring based on a double-arch tunnel with integrated middle wall are conducted to study the displacement and the stress of middle wall during excavation by bench cut method with middle drift. The effect of each excavation stages is analyzed in detail. The test results show that the displacement and stress are effected more significantly by the excavation of calotte than by the excavation of bench. The displacement-time curve is in a shape of S and the maximum displacement locates at the top of later excavated tunnel. Because the excavation of tunnel makes the stress in the other side of middle wall increase greatly and the stress in the excavation’s side increase slightly or decrease, the bending moment in middle wall is induced with the direction from the earlier constructed tunnel to the other by the excavation of earlier excavated tunnel and decreases with the excavation of later excavated tunnel.

Key words: double-arch tunnel, integrated middle wall, model test, in-situ monitoring, displacement, stress of middle wall

中图分类号:

TU 451

邱长林，刘彬，何林生，冯守中 . 整体式中隔墙连拱隧道模型试验及现场监测[J]. , 2012, 33(9): 2625-2631.

QIU Chang-lin , LIU Bin , HE Lin-sheng , FENG Shou-zhong . Model test and in-situ monitoring of double-arch tunnel with integrated middle wall[J]. , 2012, 33(9): 2625-2631.

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