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DESIGN CONCEPT OF TUNNEL SUPPORT STRUCTURE

隧道支护结构设计理念

基本信息

批准号：
14550474
负责人：
MIKAMI Takashi
金额：
$ 1.73万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550474/
关键词：
Tunnel Tunnel support Steel arch support Shotcrete Stiffness of support Confinement curve of support Design of tunnel support 鋼製支保座屈特性

项目摘要

In the design of tunnel support structure, the method called "Characteristic Curve Method" is used. The method consists of two curves ; one is convergence curve for surrounding ground and the other is confinement curve for support (CCS) based on the thin or thick ring theory. This study is concerned with the CCS. The purpose of the study is to present the newly confinement curve for support (namely stiffness of support). To this end, the tunnel is idealized as a perfectly cylindrical thin shell with two stiffening steel rings at ends. The principal conclusions of this study are summarized as follows.(1)A simple closed-form analytical expression for estimating the tunnel support (stiffness of support) is presented. In addition, this equation is useful for a better understanding of the characteristics of the tunnel support.(2)The results for the stiffness of support obtained by the present equation are less than the CCS result ; the maximum error is 20 percent.(3)The effect of stiffening steel ring may be presented in terms of an effective width L^* (=αL), where L is the length between two rings and the coefficient α is greater than or equal to 0.35 within the range of geometric and material properties considered. Thus, in the case of α≦1,a critical state may be occur in tunnel support.(4)The elasticity modulus and thickness of the shotcrete has a major effect on the value ofα.

在隧道支护结构设计中，采用了“特征曲线法”。该方法由两条曲线组成，一条是围岩收敛曲线，另一条是基于薄环或厚环理论的支护约束曲线（CCS）。本研究涉及CCS。研究的目的是提出新的支护约束曲线（即支护刚度）。为此，隧道被理想化为两端带有两个加强钢环的完美圆柱形薄壳。本研究的主要结论概述如下。(1)A给出了一个简单的封闭形式的解析表达式，用于估算隧道支护（支护刚度）。此外，该方程有助于更好地理解隧道支护的特性。（2）用本文公式计算支座刚度的结果比CCS的结果小，最大误差为20%。（3）加劲钢环的作用可用有效宽度L^*（=αL）表示，其中L为两环之间的长度，在所考虑的几何和材料特性范围内，系数α大于或等于0.35。因此，在α_1的情况下，隧道支护可能出现临界状态。（4）喷射混凝土的弹性模量和厚度对α值有较大影响。