Abstract
Main object of this study is to clarify the mechanical behavior of the surrounding ground of cylindrical cavity when a section contracts in a shallow ground. There is little clear quantitative definition of estimating the stress changes and/or extension of plastic zone around a cavity in a shallow ground caused by contraction. The authors try to represent these values around a cavity in a shallow ground by the extended cavity expansion theory presented in this study, and apply this extended cavity expansion theory to evaluate the influence of neighboring construction. As a result, it is described that the behavior of stress changes with cavity contraction can be estimated by using the presented method.
