Predicting Response of Constructed Tunnel to Adjacent Excavation with Dewatering

This paper proposes a new method for predicting the displacement and internal force of constructed tunnels induced by adjacent excavation with dewatering. In this method, total excavation-induced additional stress on tunnel is derived superposing stresses unloading dewatering effects. The effect calculated using Mindlin’s solution. principle effective Dupuit precipitation funnel curve. With beam elastic foundation then used calculating caused Based three well-documented case histories, performance proposed verified. Moreover, parametric analysis also performed to capture effects depth, tunnel-to-excavation distance, initial water level, plan view size, specific yield responses tunnels. results indicate that depth maximum vertical displacement, bending moment, shear more significant at an greater than cover tunnel. decrease nonlinearly increase in distance level. Among investigated parameters, dimension longitudinal direction affects most responses. becomes obvious as increasing level depth.