Study On Dynamic Response Of Urban Utility Tunnel Caused By Earthquake

The underground utility tunnel has outstanding advantages in alleviating urban land use conflicts,improving urban habitat environment and enhancing urban disaster prevention capacity.In the context of the construction of urban composite pipe gallery in China,it is of great Practieal signifieance to study the dynamie response of urban underground utility tunnel caused by earthquake,which can improve the seismic safety of the structure,the security level of lifeline project and the seismic and disaster reduction ability of the city.In this paper,the dynamic response of the underground utility tunnel under seismic action is studied by using the dynamic finite element method in tongling city.The main research work of this paper includes:(1)With practical engineering of a underground utility tunnel L-shaped section au,special-shaped section double storehouse,rectangular cross section on the basis of two layers of four storehouse,based on the principle of equal clearance area,set up three different points warehouse form of comprehensive utility tunnel seismic response analysis model,through the finite element method(fern)simulation,under the action of earthquake dynamic response of structure displacement,acceleration and stress research.The results show that the upper displacement of the three models is larger than that of the lower,but the acceleration of the upper part is smaller than that of the lower part.The displacement and acceleration of the 1-shaped three-bin model are more than those of the other two models.The seismic performance of the rectangular two-story double-bin section is the best in the three models.(2)The seismic response of the underground utility tunnel under three compartments is analyzed by using reverse incidence method.The results show that the main stress of the underground utility tunnel with three compartments is redistributed when the seismic wave is incident in reverse direction.The displacement and acceleration responses of the tnderground utility tunnel with 1-shaped three-bin section and rectangular two-layer four-bin section are exactly the same as those of the forward one.The displacement and acceleration of the underground utility tunnel are related to the incident direction of seismic wave.The seismic response of underground utility tunnel with irregular section is more affected by the incident direction of seismic wave than that of regular section.(3)In this paper,an analytical model of 1-shaped three-bin cross-section underground utility tunnel for large diameter water supply and drainage pipelines is established,and the influence of pipelines on the seismic response of the underground utility tunnel is studied.The results show that the large diameter pipeline eauses the increase of displacement,the decrease of acceleration and the distribution of main stress.When the pipeline is set in the lower compartment,it has the least impact on the seismic response of the Structure.Figure [37] table [20] reference [87]...