Seismic Response Of Utility Tunnel In Inhomogeneous Field

The utililty or commom tunnel is a kind of infrastructure which built in the underground to centralized laying pipeline.The construction of utility tunnel usually requires planning,design,construction and maintenance in accordance with the regulations.Nowday,our country is making great efforts to promote the construction of utility tunnel.But most of the study of seismic performance of the utility tunnel is based on the homogeneous field.Most of the earthquake damage shows that the underground structure is seriously damaged in the area where the geological conditions change greatly.In this paper,the ABAQUS finite element software is used to simulate the response characteristics of the utility tunnel in inhomogeneous field under the action of transverse and longitudinal earthquakes.The main research contents of this paper are as follows:Introduces the utility tunnel advantages compared to the buried pipeline;summarizes the development and seismic research status of utility tunnel at home and abroad;summarizes the main content and significance of this study.Based on numerical analysis method,a modeling method of utility tunnel is put forward under inhomogeneous filed condition.Including the constitutive model of soil,concrete damage plasticity model,the establishment of artificial boundary conditions,the interaction between soil and utility tunnel and the method of ground motion input,in the end,the artificial boundary conditions have been tested and verified.By using the numerical model,analyzed the response of utility tunnel in the inhomogeneous field under transverse seismic excitation.First the law of acceleration response of soil,and the interaction between soil and utility tunnel have been studied.Then the acceleration response,displacement response and stress response of utility tunnel have been researched.Based on the numerical model,the paper analyzes the response of utility tunnel in the inhomogeneous field under longitudinal seismic excitation.The acceleration response of soil and the interaction of soil and utility tunnel are studied.Then the response of utility tunnel of acceleration,displacement and stress are been studied.Finally,the seismic response of the utility tunnel in the inhomogeneous field is summarized,which provides a basis for seismic design of the utility tunnel in the inhomogeneous field.