Seismic response of underground utility tunnels: shaking table testing and FEM analysis

摘要: Underground utility tunnels are widely used in urban areas throughout the world for lifeline networks due to their easy maintenance and environmental protection capabilities. However, knowledge about seismic performance is still quite limited design procedures not included current codes. This paper describes a series of shaking table tests authors performed on scaled tunnel model explore its under earthquake excitation. Details experimental setup first presented focusing aspects such as soil container, structural model, sensor array arrangement test procedure. The main observations from program, including response, soil-structure interaction earth pressure, summarized discussed. Further, finite element (FEM) established where nonlinear properties modeled by Drucker-Prager constitutive model; master-slave surface mechanism employed simulate dynamic interaction; confining effect laminar shear box considered proper boundary modeling. results numerical compared with experiment measurements terms displacement, acceleration amplification factor soil. comparison shows that match well. validated can be adopted further analysis.