摘要
利用TSS10型三轴流变试验机对德州松软土开展不同围压下的三轴固结不排水蠕变试验,获得变形、应变率与应力和时间的变化关系,分析蠕变性状和特征,建立其分数阶类Maxwell蠕变模型。结果表明:德州松软土具有明显非线性蠕变特性,高应力水平的蠕变变形大于低应力下的蠕变变形;介绍分数阶蠕变模型原理,引用了分数阶类Maxwell蠕变模型,并求取德州松软土的类Maxwell蠕变模型参数和验证其描述德州松软土蠕变变形的适宜性。
The consolidation undrained triaxial shear creep tests are performed on Dezhou soft soil under different confining pressures with TSS10 rheometer. The relationships of axial strain and creep stain rate with stress and time are obtained. The effect of soft soil property on its creep behavior is analyzed. The extended Maxwell model is estab- lished. The results show that nonlinear creep characteristic is obviously described by creep deformation of Dezhou soft soil. The creep deformation in the range of high deviatoric stress is greater than that in the range of low devia- toric stress. Fractional creep element theory is introduced. The fractional extended Maxwell model is advised. The extended Maxwell model parameters of Dezhou soft soil are solved, which can predict creep deformation of Dezhou soft soil well.
出处
《工程地质学报》
CSCD
北大核心
2013年第6期967-972,共6页
Journal of Engineering Geology
