Seismic Analysis of Shaft and Tunnel Intersection Considering Strain-Dependent Rock Mass Behaviour

Abstract: Seismic analyses of the intersection of a shaft and an inclined tunnel were performed based on experimental results obtained with the developed nonlinear dynamic module. Analysis results showed that vertical and horizontal displacements seen in nonlinear analysis are larger than those seen in linear analysis. Also, nonlinear analysis shows bigger bending compressive stress acting on shotcrete. Bending compressive stress is concentrated in the intersection part. Through this research, the fundamental understanding of strain-dependent jointed rock mass behaviour is improved, and the analysis process can be applied to field design and analysis.