Construction of tunnel support design system in squeezing ground.

喷混凝土、锚杆和钢肋是现代隧道工程的主要支护形式。本文通过对现场和室内模型试验中所观察到的围岩挤压现象及其机理和影响因素的研究，阐明了围岩挤压现象的机理和影响因素，并对支护结构的设计方法进行了探讨。在此基础上，介绍了日本对挤压型围岩隧道的调查情况，总结了调查结果，提出了挤压型围岩隧道的挤压势、变形预测及支护设计的新方法。该方法已被应用于实际的隧道工程中，遇到的挤压问题，检查其适用性和有效性。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个应用，并与实际观测结果进行了比较。

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.