结构性软土动剪切模量试验对比研究

A comparative study on dynamic shear modulus of structural soft soils

以福州盆地广泛存在的三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,得到三层结构性软土在动荷载作用下的动剪切模量G,通过理论分析给出其归一化动剪切模量G/G max随剪应变γ变化关系G/G max-γ曲线,进而分析不同结构性软土试验结果的差异。试验及分析结果加深对福州盆地结构性软土动力特性的认识,也为进一步了解福州盆地场地地震效应提供了可靠的数据。

The three-layer structural soft soil widely existing in Fuzhou Basin is investigated as the subject. 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 shear modulus G of three-layer structural soft soils under the effect of dynamic load. And the relation curve G/Gmax -γ for normalized dynamic shear modulus G/Gmax is presented with the change of shear strain γ by virtue of theoretical analyses to further analyze the differences of test results for different structural soft soils. The test and analysis results will deepen the knowledge about dynamic properties of structural soft soils and also provide reliable data for further understanding the site seismic effect in Fuzhou Basin.