Numerical Analysis And Research On Seismic Response Of Highway Tunnel

In recent years, with the rapid development of China’s infrastructure construction, tunnelsand other underground structures are build a large number. Our country is in an earthquake-pronezone, how to ensure the tunnels normally operate under seismic force is crucial. This paper studyearthquake resistance within domain time of Ⅳ1grade rock section of highway tunnel and usingthe method of finite difference.This paper first introduces earthquake damage instances and research status of tunneldomestic and foreign. It elaborates the dynamic theory of underground structure and exploreseismic dynamic response of the road tunnel structure using numerical simulation methods.Through simulate the tunnel in different conditions to receive affecting seismic factors.Full paper mainly research the following aspects:1.Understanding of the research status domestic and foreign and certain the main severalearthquake destroyed forms of tunnel. Conduct theoretical analysis surrounding soil-structureinteraction and calculate dynamic question using FLAC3D-finite difference software.2.When analysis soil-structure interaction in time domain, seismic wave signal input need tobe processed. I should understand the spectral composition of the seismic wave signal firstly.Secondly, for saving computing time and consider the stability of the numerical results, I applyOriginPro software for processing of seismic waves so that filters out the high frequency part. Atlast, because the record seismic waves often exist the error “noise” so I use SeismoSignalsoftware conducting baseline drift correction and cancell error impact.3.Establish a dynamic response analysis model of typical tunnel cross-section. Getdisplacement and stress field when model is stable through static calculation. In the use ofFLAC3D, conduct dynamic analysis and get dynamic response characteristics of the tunnel liner(including stress response and displacement response) and compare its analysis with the staticcalculation results, at the end of finding the weak parts of the tunnel lining applied seismic force.4.Calculate seismic response under different conditions (different liner thickness, differenttunnel depth).Analysis the force and displacement response of tunnel liner structure appliedearthquake force, getting its work status under dynamic loads.5.Based on the optimization measures that cancel the set of invert by grouting at the bottom,conduct seismic dynamic calculation with flat-bottomed tunnel. Obtain dynamic responsecharacteristics of the tunnel liner of flat bottom, and analysis the feasibility of cancelling settinginvert under dynamic action. At the last part of the paper, I summarize the work this article have done as well as the mainresults, and pointed out the deficiencies in this study and the future research directions.