ABSTRACT
A recurrent problem in the design of tunnel structures is the risk management of swelling in marly or clayey rocks. This paper presents the swelling potential definition studies and the risk management concept developed for the design of one tunnel of the future m3 metro line in Lausanne, Switzerland (vd.ch/metros). It introduces the design of the tunnel against swelling and compares the sets of parameters recommended by the Geological Baseline Report (GBR) with those resulting from the calibration of the latter on site investigations. Several test simulations were performed on an advanced numerical model in order to find a dataset that accurately reproduces the ground behavior observed in the swelling tests. The purpose is to compare the internal forces of the lining and invert calculated from the geotechnical parameters and the new data set and to evaluate the influence of the new swelling parameters on the design of the tunnel.
