| Utility tunnel is a kind of linear shallow-buried underground structure which issimilar to tunnel. It can contain many kinds of municipal pipelines that are classifiedand concentrated, including water supply pipeline, heating pipe, gas pipeline, electricpower and communication pipeline, so that all aspects of the problems of the traditionaldirectly buried pipeline are effectively avoided in the process of urbanization in ourcountry. In recent years, more and more utility tunnels have been applied and developedin the process of urban construction. Predictably, utility tunnel will be a major trend ofthe urban lifeline engineering’s construction and development in the future. However,our country’s academia has been a late starter about seismic research on utility tunnel,yet we have no specialized code for seismic design of it. Generally speaking,application and research on utility tunnel now are severe deficient in our country.Therefore, it is necessary for further study about the seismic utility tunnel. Based onprevious theory and experimental result, finite element analysis software ABAQUS isused to simulate utility tunnel structure subjected to strong ground motion. Andaccording to the result, summarize and analyze the response law of utility tunnel andpipeline facilities and make some suggestions about seismic design of it.The main works of the thesis on the seismic response of the pipe-utility tunnelstructural system are as follows：(1)Present situation, significance and existing problems of utility tunnel’s seismicresearch have been elaborated in detail.(2)Basic theory of seismic response of numerical simulation about pipe-utilitytunnel structural system has been discussed, constitutive model of soil andplastic-damage model of concrete have been introduced, the interaction between pipeand buttress, buttress and bottom plate of utility tunnel, utility tunnel and soil have beensimulated. And the artificial boundary of soil is simulated by infinite element developedby means of ABAQUS software. Then, finite element model of pipe-utility tunnelsystem has been set up.(3)Selecting El-Centro wave with peak acceleration of0.1g,0.2g,0.4g as groundmotion input, numerical simulation and analysis of utility tunnel model have been maderespectively and response rules of tunnel’s acceleration and stress has been summarized.Meanwhile, development tendency of tunnel’s whole damage and development processof its local damage has been obtained, and based on damage factor of tunnel damage index, some reasonable advices about seismic design have been put forward.(4)According to the results of finite numerical simulation, conclusions aboutresponse rules of pipe’s acceleration and stress in the tunnel have been made. Andcompared with computed seismic stress results of approach to specification and finiteelement method on traditional directly buried pipeline, a analysis has been made aboutthe diversity among results. The analysis of result shows that pipelines in utility tunnelssubjected to earthquakes are protected and their seismic capacity is strengthened by thetunnels. |
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