Abstract
The finite element software ABAQUS is used to establish the seismic time-history analysis model of the utility tunnel joints. The viscoelastic boundary is employed to input the seismic wave through the equivalent nodal force. Considering the nonlinearity of the soil and concrete materials, the internal force of the cross-shaped utility tunnel is calculated, and the influence effect and influence range of the cross joints of the utility tunnel are also studied. Studies have shown that the internal forces near the cross joints increase significantly. The research has certain reference value for the seismic design of the cross joints in utility tunnel.
Highlights
Over the years, with the rapid development of utility tunnel construction, the seismic performance of the cross joints of utility tunnel has received extensive attention
Different ground motion input methods of underground structure are discussed and the displacement input is recommended as a more accurate input method
The seismic wave acting at the viscoelastic artificial boundary consists of two parts, one part is the original incident seismic wave, and the other part is the reflected wave generated by the internal seismic wave at the boundary position, and the equivalent node force applied is to simulate the effects of these two waves, to ensure that the displacement and stress at the artificial boundary are consistent with the original free field
Summary
With the rapid development of utility tunnel construction, the seismic performance of the cross joints of utility tunnel has received extensive attention. Earthquakes occur frequently in China, the seismic analysis of utility tunnels and their cross-joints is of great significance for the seismic design of utility tunnel. Liu et al [4] studied the error source of the quasi-static method of underground structures through finite element software comparison analysis, and improved and optimized the seismic wave loading method of the reaction acceleration method. Shi et al [5] established a three-dimensional dynamic finite element numerical model for a dualcompartment utility tunnel and applied a pulse load to the boundary of the model to generate Rayleigh waves, and compared that with the conventional time-history analysis considering only the bottom lateral action, Through this comparison, the effects of different soil constitutive models, buried depths, incident angles and different cross-sections on the seismic behavior of the utility tunnel under the combined action of Rayleigh wave and
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