林业工程学报2025，Vol.10Issue(2)：156-164,9.DOI:10.13360/j.issn.2096-1359.202406035
南黄海大丰海域海洋土动剪切模量和阻尼特征研究
Study on dynamic shear modulus and damping characteristics of Marine soil in Dafeng Sea area,South Yellow Sea
摘要
Abstract
In order to investigate the dynamic modulus and damping characteristics of marine soils in the Dafeng region of the South Yellow Sea.GDS cyclic triaxial tests were conducted on various soil layers within a depth range of 0-200 m.The results showed that the distributions of dynamic shear modulus and damping ratio of the soil in this region approximately followed normal distributions at all strains.The coefficient of variation of the modulus ratio exhibited a positive correlation with shear strain,whereas the damping ratio showed the opposite trend.In general,the variability of the damping ratio was more pronounced than that of the modulus,and soil type had a significant effect on this variability.In the four typical regional soils,they were ranked in the order of clay,sand,silt and sandy clayey interbedded soil.Compared with marine soils from other regions of China,the shear modulus of soils in this region was relatively low,while the damping ratio increased slowly in the strain range of 1×10-6 to 5×10-4,and more rapidly beyond this,resulting in higher final damping values.The corresponding G/Gmax-γ and λ-γ curves exhibited a weak nonlinearity and hysteresis,reflecting the regional dynamic characteristics.The Gmax showed a consistent increase with depth,with the most significant growth rate observed in silty soils.The effect of depth on the maximum dynamic shear modulus in the Dafeng region was relatively less pronounced when compared with other regions.Based on these findings,the recommended values for the marine soils at different depths in typical strata of the Dafeng region were provided,offering valuable reference for seismic safety assessments of marine construction projects in this area and for future seismic zoning efforts.关键词
海洋土/动剪切模量/阻尼比/动三轴试验Key words
marine soil/dynamic shear modulus/damping ratio/dynamic triaxial test分类
建筑与水利引用本文复制引用
陈蕾,冀卫东,陶小三,李荣富,王海波,朱海伦..南黄海大丰海域海洋土动剪切模量和阻尼特征研究[J].林业工程学报,2025,10(2):156-164,9.基金项目
国家自然科学基金(52078187) （52078187）
江苏省自然科学基金(BK20150885) （BK20150885）
江苏高校优势学科建设工程资助项目(PAPD). （PAPD）
