Construction of tunnel support design system in squeezing ground.

喷射混凝土、锚杆和钢肋是现代隧道施工中的主要支撑构件。尽管喷锚加固技术得到了广泛的应用，但对喷锚加固效果的合理设计方法的基础性研究还很少。通过对现场破坏的仔细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相关因素。在此基础上，对日本挤压岩层隧道进行了广泛的调查，并对调查结果进行了总结，提出了一种预测挤压岩层隧道的挤压势和变形以及进行支护体系设计的新方法。将该方法应用于实际隧道工程中遇到的挤土问题，验证了该方法的适用性和有效性。作为具体实例，给出了预测挤压力、变形和支承体系的方法的几个应用，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.