Simulation Of Multi-Dimensional Seismic Field In Mountainous Area

Earthquake is a process of rapidly releasing energy from the earth's crust.In the process of energy release,seismic waveguides are produced in the process of energy release.When an earthquake occurs,the buildings on the ground shake violently with the uneven ground,causing structural damage.After collapse,it will also cause harm to people,and have a great impact on social and economic effects.China is located between several major seismic zones in the world.Since ancient times,China has been a country with frequent strong earthquakes.With high frequency and wide range of earthquakes,almost all regions in China have been harmed by earthquakes,which is one of the countries most affected by earthquakes.In recent decades,with the reform and opening up,China's comprehensive national strength has been rapidly improved,and remarkable achievements have been made in the economy.The infrastructure construction has been constantly improved.A large number of major construction projects are being implemented gradually.With the rapid development of the national economy,the economic losses caused by the earthquake are becoming increasingly serious.Since the city is the economic center of a region,most of the researches on earthquake prevention and disaster reduction are concentrated in plain and urban areas.However,as an integral part of national economic development,villages and towns are rarely mentioned,and the country pays more and more attention to the development of rural areas.Village buildings are usually simple and crude,the geological and topographical conditions of the site are complex,and the structure can not meet the requirements of seismic fortification.This paper selects Shuimo Town,Wenchuan County,Aba Tibetan Autonomous Prefecture,Sichuan Province as the main research object,and discusses the multi-dimensional seismic field related to the village environment(1)Earthquake mitigation engineering plays an important role in earthquake prevention and serves the people's livelihood.Based on the summary of historical seismic data of Shuimo town research site,the scope of regional seismotectonic background study and the selection range of regional seismic data are determined as follows: the geographical area with the site as the center and radius of about 150 km,namely 101.5 ° to 105.1 ° e,29.5 ° to32.5 ° n.According to the idea of probabilistic ground motion simulation method,the response spectrum curves of bedrock horizontal ground motion with the exceedance probability of 63%,10%,2% and 0.5% of the target site in 50 years are obtained,which provides the basis for earthquake prevention and disaster reduction in this area.(2)This paper summarizes the ground motion simulation technology at home and abroad.On this basis,the finite fault method is used to simulate the near-field strong ground motion in Shuimo Town,Wenchuan County during the Wenchuan earthquake.The region is divided into grids,and the finite fault model based on dynamic corner frequency is used to simulate the ground motion.The grid points are divided into two parts by using the exsim program The velocity time history is simulated and the peak acceleration is recorded.The obtained data are input into Origin Software for fitting analysis of peak acceleration.Finally,the acceleration contour map of relevant area is obtained,that is,ground motion field.The research results explain the different damage degree of the village buildings in different areas of Shuimo Town,and provide the basis for post disaster rescue and seismic fortification.(3)Combined with the characteristics of seismic activity in the surrounding areas of villages and towns,the influence of seismic torsion component on rural buildings is further considered on the basis of traditional translational ground motion.The torsional seismic field is obtained from the translational seismic field,which provides the basis for the torsional design of rural buildings in the target site.