海洋粉质粘土共振柱试验研究
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摘要
利用DRNEVICH LONG-TOR型共振柱仪研究杭州湾浅层粉质粘土的动力学性质,阐述动模量和阻尼比随应变增加的变化趋势,分析动模量衰减规律。最大动模量主要与围压Pc、土的固结密度、动应变和初始孔隙比等因素有关;杭州湾粉质粘土动模量随应变的变化规律符合土的非线性、滞后性和变形累积三方面的一般规律;杭州湾粉质粘土与黄河三角洲地区的归一化应力应变曲线相似,而动阻尼比相差较大。
Stress-strain behavior of silty clay in Hangzhou bay is studied by using 'DRNEVICH LONG-TOR' resonant column apparatus.The change trend of dynamic module and damping ratio with strain increasing is analyzed,and the attenuation law of dynamic is gained.The max dynamic module is mainly relevant with confining pressure,consolidation density,initial pore ratio and dynamic shear strain.The Gd~γd curve accords with soil nonlinearity,hysteresis,and accumulative deformation.The silty clay from various regions have analogous stress-strain curve but variant damping ratio.
引文
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