Study On Discrimination Of Sand Liquefaction And Analysis Of Stability Of Foundation Liquefaction In Songyuan Area Of Jilin Province

This article collect matsubara region of geological exploration data,seismic data,combining previous research results and matsubara region in vestigated condition of soil samples,selected 10 liquefaction index,using the theory of grey relational analysis to find the larger influence on sand liquefaction matsubara area correlation factors,based on the index of liquefaction level more quantitative discriminant model and seismic deformation of foundation is analyzed,the results of the study to matsubara region provides the technical support of foundation liquefaction resistance.The main work and achievements of this paper include:1.The geological exploration data and historical seismic data of songyuan area were collected and summarized,and the geological structure and historical seismic data of songyuan area were summarized.There were frequent earthquakes and serious liquefaction disasters in recent 5 years.2.Basic physical and mechanical laboratory tests were conducted on soil samples taken from qianguo county,songyuan city,such as sieving experiment,drying method,ring knife method,etc.,to study the basic physical and mechanical properties of soil samples.The sandy soil in songyuan area is mostly saturated soil with low density and loose structure,which is more conducive to liquefaction.3.The analysis principle of grey relational degree is introduced.Using the method of grey correlation degree evaluation of selected 10 the influence of sand liquefaction index in the study area,the evaluation results as the basis of model sand vibration liquefaction.4.This paper introduces the principle of BP neural network model,the comprehensive selection of earthquake acceleration,embedded depth of groundwater table,clay content,the average uneven coefficient,liquid particle5.diameter,layer thickness and the overlying seismic intensity of liquefied soil layer,the nine indicators as the main influencing factors of sand liquefaction,sand vibration liquefaction model is set up in jilin matsubara sandy soil liquefaction discrimination in the earthquake zone,and the precision of the model are verified,the evaluation accuracy can reach 96.875%.6.The soil samples with higher liquefaction level were selected,the foundation model was established based on Geostudio software,and the seismic liquefaction deformation analysis of sandy soil foundation in songyuan area was carried out by using the finite element numerical calculation method.The simulation results showed that the liquefaction degree of no.25 soil sample was higher than that of no.14 soil sample,which was consistent with the discriminant result of BP neural network.