Prepare of the nomogram for simple design of the secondary lining in squeezing ground

Abstract

In the tunnel located in squeezing ground, convergence of displacement may not be completed, before constructing secondary lining. For this reason, load may act on lining, after constructing secondary lining. In such a case, the design method which does not exceed the proof stress of secondary lining is required. At present, the method by frame analysis is widely used for the design method of secondary lining. In this report, we prepared the nomogram without performing frame analysis, and examined the applicability to design.