Seismic Response Of "y" Type Ground Fissure Sites Under Strong Earthquake

Ground fissures is a kind of typical geological disasters in Fenwei Basin, Xi’an is locatedin the place where tectonic activities are relatively intense, which is in Weihe river plain ofChina’s famous North China seismic belt. North China seismic zone and north-south seismicbelt is the turning point of the area, where appeared strong earthquakes many times in history.The characteristic of dynamic response fissure were rare reports. Carrying out the research ofthis aspect has good scientific significance and good application prospect.This paper by using finite element software ANSYS a single ground fissure and "y" typefissure sites were established. Researching in earthquake to crack under the action ofmechanical response, I have obtained the two kinds of ground fissures under specialconditions on both sides of the displacement, acceleration and the shear stress responselaw.Summarized as follows.Under the action of strong earthquake, a single fissure site and "y" type fissure conditions,hanging wall and footwall both produce rupture, and exist obvious hanging wall/footwalleffects. Displacement, acceleration and peak shear stress in hanging wall are all bigger thanfootwall. Displacement, acceleration and peak shear stress in foot change somewhat flat.Displacement, acceleration and peak shear stress in hanging wall and footwall along with theincrease of space and ground fissures reduce gradually. The ground fissures haveamplification effect to these values.Under the action of strong earthquake, displacement, acceleration and peak shear stress of"y" type fissure are all bigger than those of a single fissure. The hanging wall effect is to acertain extent increase. To the displacement response, subprime cracks significantly influenceto the main fracture, and it is not very obvious to acceleration response and shear stressresponse.