The Anti-Seismic Research Of Underground Constructures

In the recent years, with the development of our nation's economy and the rapid increasement of the citizen,the environment pollution is serious day by day,our nation's building on the ground cann't satified the command of the traffic and business,in order to relieve the ground traffic and the crisis of the energy,underground constructures develop rapidly,so it is very important to study the anti-seismic on underground constructures. For a long time,people usually think the number of underground constructures is few,and the anti-seismic ability of underground constructures is better than ground constructures,so the damage to underground constructures from earthquake is lighter than ground constructures.but the banshen earthquake in Japan in 1995,nearly all the underground constructures were damaged badly,the open exvacate sub-railway was damaged seriously for the first time,especially DAIKAI station and KAMISAWA station were damaged thoroughly,most of the columes were collapsed,the upper board were collapsed,many big cracks appeared in the side walls,which affected the foundation of the nation way into collapsing, the biggest crack was 15 metres,which result in the south of JAPAN in paralysis.There happened many earthquakes resulting in damagement on underground constructures.for example:earthquake in AMERICAN in 1906; earthquake in AMERICAN in 1952,which caused serious damage to the society.so in the present society,it is necessary to study the antiseismic research. This article utilizes the finit element software ANSYS to analysis the underground constructions.because the longth of the tunnel is far long than the its'other sizes,so we can simple the three dimensions construction into two dementions problem,selected three kinds earthquake waves,they are EL-centro wave,artificial wave and TAFT wave,I also adapt the earthquake waves'amplitude by CHANG CHUN region's earthquake intensity,the time of the earthquake I selecte is 10 second,and the interval of the time is 0.02 second,so every earthquake wave we can read 500 records.In this ansys,I assume the direction of incidence is vertical,the soil is well-distrubuted and nonlayer.Because the finit element analysis is for finit region,so I select partial soil as researth target,At the side of the tunnel,I selected 4 times tunnel's weith soil,considering the buried depth of the underground constructures,the inertia force and constructures'rigidity,nonsoiltional constructures,It analysis the distortion and the dynamic response of the underground constructures,I try to find the basic rules of the underground constructures'earthquake response ,and also put forward useful suggestions on the anti-seismic designing of the underground constructures. 1,The response of the underground constructures is main affected by covering soil on it, not by its inertia force and constructures'rigidity, in the anti-seismic designment of the underground constructures,increasing the gentleness and ductility can increase the underground constructures'anti-seismic ability.It is not reasonable only increasing ground constructures'strength can increase the anti-seismic ability.