ABSTRACT
This research proposes a new model targeting expansive bedrock by means of combining an elastoplastic model considering electro-chemo-mechanical phenomena with the Cam-clay model introducing cementation and its degradation due to plastic deformation. Tunnel excavation and swelling analyses are demonstrated by incorporating the proposed model into a finite element analysis code. The simulation results indicate that swelling occurs in narrowed area such as the bottom of the tunnel and swelling phenomena suddenly develops likewise real observation although ion-concentration change is uniformly given in the entire analysis area. This research unraveled the mechanism of the swelling phenomenon with the object of interaction between electro-chemo-mechanical phenomena on the surface of expansive clay mineral crystal and yield of bedrock skeleton accompanied with degradation of cementation.
