Study on the shaking table liquefaction model test of coral sand with controlled saturation
In order to investigate the anti-liquefaction capability of coral sand sites,this study conducted shaking table model tests controlling the degree of saturation to overcome the vague saturation state in general model tests.By comparing the dynamic response and liquefaction behavior of coral sand and quartz sand with similar degrees of saturation,gradation,and relative density,the liquefaction characteristics of coral sand sites were discussed.The experimental results show that both materials are in a liquefiable state under similar degrees of saturation without showing significant differences in anti-liquefaction strength.Before liquefaction,the shear modulus of coral sand is significantly higher than that of quartz sand.If current Vs liquefaction assessment method is directly applied,the site would be judged as non-liquefiable,thereby overlooking the liquefaction risk in the use of coral sand sites.After liquefaction,the shear modulus of both tends to be zero,indicating that the post-liquefaction seismic damage of both types of sites is similar.This study has proven through indoor model tests that coral sand is a liquefiable soil with anti-liquefaction strength similar to that of terrestrial sand,corroborating the results of previous seismic damage investigations.Furthermore,the model saturation preparation method and the degree of saturation evaluation method used in this study can provide technical reference for future coral soil model tests.
万方数据
维普
