The Dynamic Analysis On The Pearl Marine With Different Degree Of Consolidation

Previous research on marine soil is mainly focused on the dynamic characteristics of the soil which is under normal consolidation state. However, due to the great difference of composition between marine and land soil, some of the marine soil under cyclic loadings is not under normal consolidation state, but is under micro over-consolidation or over-consolidation state. Therefore, it is necessary to study the dynamic characteristics of over-consolidated soil under cyclic loadings.This article has performed static and dynamic tri-axial tests under different consolidation states based on the marine soil from Zhujiang.Based on the experimental data, the analysis is carried out, and the following results are obtained:(1)By conducting static tri-axial tests on soil samples with different over-consolidation ratios, we have achieved the following conclusions:The dynamic strain increases with the increase of the partial stress.The greater the over-consolidation ratio, the greater the shear strength.By verifying the relationship between the undrainaed shear strength of the normal consolidation and over-consolidated soil, it is concluded that the soil sample used for this test is feasible.(2) By conducting the dynamic tri-axial dynamic elasticity modulus testing on soils samples with different over-consolidation ratios, we have achieved the following conclusions:the soil shear strain increases along with the increase of the shear stress, but decreases along with the increase of the frequency and over-consolidation ratio; the dynamic elastic modulus increases along with the increase of the frequency and over-consolidation ratio. By analyzing thed1E-dynamic strain amplitude relation curve, we have obtained a constitutive model ofd1 E on frequency and over-consolidation ratio. The residual strain increases along with the increase of the dynamic stress, but decreases along with the increase of the frequency and over-consolidation ratio; the damping ratio first decreases and thenincreases along with the increase of the dynamic shear strain, and increases along with the increase of the over-consolidation ratio.(3) By conducting the dynamic tri-axial dynamic strength testing on soils samples with different over-consolidation ratios, we have achieved the following conclusions: the total strain decreases along with the increase of the frequency and over-consolidation ratio, but increases along with the increase of the cyclic stress ratio; the softening index decreases along with the increase of vibration times and cyclic loading, but increases along with the increase of the frequency. By conducting regression analysis on the softening curve and dynamic strength curve, we have obtained the softening coefficient on over-consolidation ratio and the dynamic strength empirical equation, respectively.(4) We have also built the over-consolidation constitutive model on Zhujiang marine soil, based on the modified Cam-Clay model, and the relevant parameters have been calculated:?=0.085936,k=02784.0,M=86.M_h=3 ?...