EFFECTS OF LOADS DURING CONSTRUCTION ON THE DESIGN SECTIONAL FORCE OF ELLIPSOIDAL TUNNEL LINING

Abstract

Conventionally, shield tunnels mainly have been circular section in form becauseof superior workability and safety. Recently, however, different forms of shieldtunnel sections, such as ellipsoidal tunnels, etc., have come to be constructed.In such cases, special design conditions due to the tunnel section shape apply. In particular, it is necessary to understand the effects of loads, such as grouting pressure, which temporarily act on the lining structure during construction.
This paper evaluates the effects of loads during construction on tunnel lining sections for elliptical tunnels and considers the safety of construction of ellipsoidal shield linings