1994 Volume 4 Pages 139-146
Model tests on vertical twin tunnel by MF shield with three faces were carried out by using the shield model with cutting and muching function and the lining model with the function of generating tail void. Here, five factors, i.e., muching ratio, order of construction, vertical distance ratio, relative density of ground and width of sand box were adopted as the experimental factor. Acting pressure on first tunnel lining, and ground behavior due to the excavation of rear tunnel were discussed. As results, the acting pressure versus the above experimental factors were made clear.