盾构隧道始发与到达段环间纵向压力空间分布规律研究

柳献; 杨振华

doi:10.3973/j.issn.2096-4498.2020.11.002

隧道建设 >

2020 , Vol. 40 >Issue 11: 1552 - 1557

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.11.002

研究与探索

盾构隧道始发与到达段环间纵向压力空间分布规律研究

柳献 ,
杨振华

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（同济大学，上海 200092）

柳献（1977—），男，湖北武汉人，2006 年毕业于同济大学，结构工程专业，博士，教授，主要从事隧道与地下建筑结构方面的教学和科研工作。E-mail: xian.liu@tongji.edu.cn。

网络出版日期: 2020-12-09

基金资助

上海市2017年度科技创新行动计划（17DZ1203902）

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Study on Spatial Distribution Law of Longitudinal Pressure between Launching and Reaching Sections of Shield Tunnel

LIU Xian ,
YANG Zhenhua

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（Tongji University, Shanghai 200092, China）

Online published: 2020-12-09

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摘要

现场实测数据表明，盾构隧道始发与到达段各断面纵向压力较小，可能导致环缝漏水。为解决此问题，通过求解描述隧道变形特征的微分方程，获得隧道始发与到达段纵向力的分布规律；并以此为依据，提出纵向拉结构件的设计方法。研究结果表明： 1)在不采用拉结措施的情况下，进出洞口附近纵向力最小，接近于0； 2)距离洞口越远的断面，其纵向力越大； 3)采用纵向拉结措施可以有效地增大始发与到达段断面纵向力。在对纵向拉结构件进行设计时，其最小横截面积由隧道刚度和环缝止水垫闭合压力决定，其最小长度由隧道和地层之间的切向黏结刚度决定。

关键词： 盾构隧道; 纵向力; 始发与到达段; 拉结措施; 设计方法

本文引用格式

柳献 , 杨振华 . 盾构隧道始发与到达段环间纵向压力空间分布规律研究[J]. 隧道建设, 2020 , 40(11) : 1552 -1557 . DOI: 10.3973/j.issn.2096-4498.2020.11.002

Abstract

The field monitoring data demonstrate that longitudinal pressure of each crosssection between launching and reaching sections of shield tunnel is very small, which would lead to water leakage. As a result, the distribution of longitudinal stress is proposed by solving differential equations describing tunnel deformation characteristics, and based on which, the design method of the longitudinal tie component is proposed. The results show that: (1) The longitudinal stress near the tunnel portal is the smallest(close to zero) without longitudinal tie. (2) The longitudinal stress increases with the distance from tunnel portal increase. (3) The longitudinal stress can be effectively increased between the launching and reaching sections by adopting longitudinal tie. The minimum crosssectional area of longitudinal tie component is determined by the tunnel stiffness and the closure pressure of the annular joint waterstop gasket, and the minimum length is determined by the tangential bonding stiffness between the tunnel and stratum.

Key words： shield tunnel; longitudinal stress; launching and reaching sections; longitudinal tie; design method

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