【摘要】 以福州盆地广泛存在的3层结构性软土为研究对象,首先阐述了三者的沉积特征及常规物理力学性质,然后利用共振柱试验仪进行了一系列不同固结应力下动力试验,得到不同结构性软土在动荷载作用下的动阻尼比λ,通过数值分析给出其阻尼比λ与剪应变γ关系曲线,进而分析不同结构性软土试验结果的差异。试验结果表明:动阻尼比λ与剪应变γ关系与固结应力没有很强的相关性,在剪应变0.00001～0.01范围内三层结构性软土λ-γ曲线差异较大。试验成果为进一步了解福州盆地土层地震效应提供了可靠的数据,具有现实意义。更多还原

【Abstract】 This paper investigates the three-layer structural soft soil that widely exists in Fuzhou Basin.First,the sedimentary features and conventional physical mechanics properties of the three soils are illustrated respectively.Then by means of the resonant column test instrument,a series of dynamic tests are conducted with different consolidation stresses to attain the dynamic damping ratio λ of different structural soft soils under the effect of dynamic load.The relation curve of damping ratio λ and shear strain γ is presented by virtue of numerical analyses to further analyze the differences of test results for different structural soft soils.Tests show that the relation of dynamic damping ratio λ and shear strain γ doesn’t have strong correlation with consolidation stresses and the curve λ-γ of three-layer structural soft soil has large difference when the range of shear strain is between 0.00001 and 0.01.The test result will provide reliable data for further understanding the seismic effect of soil layers in Fuzhou Basin,and it is of real significance.更多还原