| With the rapid development of China's economy and the speeding up of urbanization,the construction of urban subway engineering in our country has already entered the heyday.Because the subway engineering is costly and irreversible,once an earthquake happens,it can give people's life and property safety great losses.Soft soil can increase the damage of the earthquake,so the research of soft soil layer shield subway tunnel seismic response characteristics is of great significance and reference value.The contents researched in this thesis are as follows:(1)This article chooses three typical weak areas of the northern section of Shanghai metro line 11 as the research field with the El-Centro-seismic wave chosen as the bedrock of the ground motion input.It Uses the large finite element software ANSYS analysis of rectangular subway tunnel in Shanghai three reaction characteristics of ground motions,and briefly summarizes the tunnel in three kinds of the reaction rule of ground motions.(2)Based on the seismic response performance of rectangular shield subway tunnel,it analyzes the influences of tunnel lining elastic modulus,lining thickness and tunnel depth to the tunnel seismic response characteristics and it gives the influence law.(3)It gives a comparative analysis of tunnel seismic response characteristics between circular tunnel and rectangular section tunnel,and it gives the ground vibration response laws between circular tunnel and rectangular section tunnel.(4)Based on the seismic response performance of circular tunnel,it analyzes the influences of sectional area to the tunnel seismic response characteristics and gives the influence law.Based on Shanghai soft stratum shield subway tunnel structure,this paper analyses the seismic response characteristics of the subway tunnel,then some significant conclusions are obtained which for further of metro tunnel in soft soil layer seismic research has certain reference significance. |
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