The Study On Mutual Influence Mechanics Of Seismic Response For The Underground And Surface Structure

Considering the safety,the subway seismic design is the main content of engineering earthquake resistance and urban disaster prevention and mitigation.Due to the construction of three-dimensional city,interaction of the underground structure and near surface structure when an earthquake occurred becomes an important subject in seismic design.Therefore,this article focuses on the mutual influence mechanism between the underground structure and the on-earth frame structure when an earthquake occurred.First,in order to provide theoretical guidance for the later research of regularity,seismic response of soil were studied with the different forms of underground structures when an sine wave incentive was input.Then,with a subway station in Ningbo as the basic engineering background,the paper researched the relative layer displacement of the underground structure and on-earth structure of the relative displacement.Finally,the mutual influence of the underground structure is studied with the different variables under the earthquakeThe main conclusions are as follows:(1)To some extent,the existence of the underground structure can magnify by the dynamic response of soil,but the existence of the surface structure can restrain the dynamic response of the soil,and the seismic response of the ground structure to soil is larger than that of the underground station.(2)With the small change of relative position of the surface structure and the underground structure,the dynamic response of the soil has no obvious change.(3)The existence of surface structure can greatly influence on the deformation of underground station structure,and it can restrain the deformation of underground station to some extent.(4)When the structure of the underground station is relatively small in size or is relatively far from the surface structure,the influence of the underground structure on the seismic dynamic effect of the surface structure is not obvious.(5)The size of underground tunnels is relatively small,and its influence on transmission of seismic wave is very limited,so its impact on the seismic response of the on-earth structure is also very limited.