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Construction of tunnel support design system in squeezing ground.

挤压地基隧道支护设计体系构建

基本信息

批准号：
05555139
负责人：
AKAGI Tomoyuki
金额：
$ 0.96万
依托单位：
Toyota National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555139/
关键词：
Tunnel Expansive Ground Squeezing Sopport System Rockbolt Deformation Competence Factor 支保工の設計地山強度比

项目摘要

Shotcrete, rockbolts and steel ribs are principal support members in modern tunelling. In spite of their widespread use, it is very rate to find any fundamental study on the proper design method for the reinforcement effect of support systems consisting of shotcrete, rockbolts and steel ribs.The squeezing phenomenon of rock around tunnels and its mechanism and associated factors are clarified by studying carefully observed failures in-situ and in laboratory model tests. Then, an extensive survey of tunnels in squeezing rocks in Japan is presented and the results of this survey is summarised.A new methodsis proposed to predict the squeezing potential and deformation of tunnels in squeezing rock and to design of support systems. The method has been applied to actual tunnelling projects, where squeezing problems encountered, to check its applicability and validity. As concrete examples, several applications of the method to predict the squuezing potential and deformation and support systems are given and compared with actual obsevations.

喷射混凝土、锚杆和钢肋是现代隧道施工的主要支护构件。尽管喷射混凝土、锚杆和钢肋组成的支护体系得到了广泛的应用，但对其加固效果的合理设计方法进行基础性研究的情况却很少。通过对现场观察和室内模型试验的研究，阐明了隧道围岩的挤压现象及其机理和影响因素。然后，介绍了在日本对挤压岩隧道的广泛调查，并对调查结果进行了总结。提出了一种新的方法来预测挤压岩中巷道的挤压势和变形，并进行支护系统的设计。将该方法应用于实际隧道工程中遇到的挤压问题，验证了该方法的适用性和有效性。作为具体实例，给出了该方法在预测挤压势、变形和支护系统中的几种应用，并与实际观测结果进行了比较。