RATIONAL PROPOSAL OF DESIGN AND CONSTRUCTION METHOD IN SQUEEZING ROCK TUNNELS

It is a common practice for tunnel engineers, who work on squeezing rock tunnels with having the possibility of large displacement, to decide empirically countermeasures against reducing displacement, the support rank, and the tunnel construction method. However, it has not been clearly understood yet regarding to this countermeasures of displacement reduction, i.e. the quantitative evaluation, the standard of support rank, and its construction method. This paper describes the results of analysis from the past tunnel constructions in concerned ground. The aims is that the tunnel engineers are able to handle the occurred condition of squeezing ground with grasping the information of ground condition in advance based on the viewpoints of empirical tunnel engineering.