The Response Analysis Of Subway Station In Soft Soil Under Earthquake

With the rapid development of Chinese economy,the scale of underground subway construction is enlarged quickly;there are more than 30 cities constructing or planning to construct subway or light-rail.The subway also has the function to defense some surprise attacks,which shoulders the important social effect.It will bring large economic losses when it is destroyed.It is significant to study the seismic characteristic of subway which is built on the soft site.The main content in this dissertation include:(1)In this paper,a procedure ANSYS-FLAC^3Dis proposed to build the three -dimensional numerical model under earthquake of FLAC^3Dby using ANSYS.And then numerical simulation is done by FLAC^3D.(2)The strong earthquake record,the Qingping ware,which is recorded in Qingping town,Mianzhu city,when the Wenchuan earthquake occurred,is selected as the bedrock input ground motion.The response characteristics of the subway station is analyzed under three cases of input ground motion,that is,only input horizontal acceleration,only input vertical acceleration,and input both horizontal and vertical acceleration.The results include the dynamic interval force response and the deformation of the subway station structure,particular the dynamic interval force and the deformation of the centre column.(3)The subway station joint structure is established and response characteristics of the subway station is analyzed under the three cases.The results also include the dynamic interval force response and the deformation of the subway station structure and the joint structure.(4)The acceleration response of subway station structure and the joint structure from different direction acceleration is considered.And the studied results the acceleration response rule of the underground structure.In this dissertation,the underground structure in soft soil is selected as the object to study,and the Qingping ware is selected as the input ground motion.the studied results the rules of the seismic characteristic and the seismic response characteristics of underground structure form different direction acceleration.The results in this dissertation will direct the following research for the underground subway which is built on the soft site.Also the results will direct the subway construction in Chengdu city, Chongqing city or other cities in which strong earthquake is potential of occurring.