トンネル支保のマルチ化に関する研究

抄録

More than fifteen years have passed since JH employed the New Austrian Tunneling Method (NATM) as a standard method of tunneling, in which shotcrete and rock bolts are used for supports.
The NATM is an approach or philosophy which features the continual monitoring of the rock movement and the revision of supports to obtain the most stable and economical lining. However, there is no concrete method for revising support reflecting the results of monitoring.
Thus, JH creates a new system which consists of new rock mass classifications and new standard support patterns in order to select the most suitable support pattern at the tunnel construction sites, by analyzing data collected from tunnel construction sites and experimental works. This new system has been introduced into nationwide tunnel construction sites of JH on a trial basis. We describe herein the results of the introduction of the new system.