Statistics And Analysis Of Soil Dynamics Parameters In The Urban Of Wuhan

Soil dynamic parameters are important parameters of earthquake engineering,geotechnical engineering and other engineering applications.Many scholars have studied,and obtained many valuable results.But the research results of different scholars have some degrees of difference,because of different sampling area,test equipment and test methods.In the area of Wuhan,statistical research is less,and whether the current research results can be well applied in engineering applications still need to be verified.This article will research from the dynamic test of soil,data analysis and engineering applications,to analysis the dynamic shear modulus ratio and damping ratio of the soil in Wuhan.Considering the significant impact of soil dynamics parameters for seismic response of soil analysis results,this paper will basis on soil dynamic triaxial test,and according to a large number of dynamic triaxial test data,to statistically analyzed the dynamic shear modulus ratio and damping ratio of major soil in Wuhan.The statistics selected 530 sets measured data of soil samples from 146 Project Site（353 seismic exploration drilling）,432 sets of data were filtered and grouped according to the properties of the soil layer thickness of Wuhan.This paper gives the statistical average value and Standard Deviation of soils dynamic shear modulus ratio and damping ratio of 6 major types of soil.The statistical results of each group were fitted by Hardin formula and Hardin modified formula,in order to compared with standard value（China Earthquake Administration,DB001-1994）and recommended value（Yuan xiaoming et al.,2000）.This paper gives the fitting parameters of the relationship between G/G_max andγ,λandγ,which can be used in Wuhan suitably and convenient for general engineering applications.In terms of parameters applications,this paper would take seismic response analysis of soil layers for example.Useing different kinetic parameters in four soil layer models for seismic response analysis of soil layers.And analysis the influence t,which caused by using different kinetic parameters such as Statistical value,standard value and recommended value,according to the difference of results,such as response spectrum,peak ground acceleration and characteristic period.By comparing the soil dynamic parameters and the seismic response analysis results of soil layer,we can see that the dynamic shear modulus ratio and damping ratio in wuhan have significantly different with standard values and existing achievements.The kinetic parameters of soil statistics are divided by depth distribution characteristics according to Wuhan,and this division is consistent with the specific circumstances of Wuhan soil depth distribution.The soil samples used in the test are in large quantities,and sampling point distribution density,which can be more authentic and reliable reflect the actual situation of Wuhan soil dynamic properties,the resulting data would be better suited for reference in Wuhan relevant work.