Ground settlement model for excavation of a non-partial pressure and shallow buried double-arch tunnel

Abstract

The ground settlement model due to tunnel's excavation was summarized in this paper. Firstly, the geological characteristics of a double-arch tunnel in Jinliwen Expressway are investigated and analyzed, which mainly act as discontinuity. Especially, settlement pattern during excavation of such a double-arch tunnel with non-partial pressure and shallow bury was taken out by data analysis from those monitoring information. After ground settlement model and its increment model following the each step of tunnel's excavation were built, the difference of forecasting between single tunnel and double-arch tunnel was shown. Secondly, the ground settlement model was testified by comparing between forecasting and field data. Thus, theoretical basic to avoid overmuch settlement during excavation of such a double-arch tunnel was provided. © 2008 Science Press Beijing and Springer-Verlag GmbH Berlin Heidelberg Geotechnical Engineering for Disaster Mitigation and Rehabilitation.