砂卵石土的剪切流变特性研究

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砂卵石土的剪切流变特性研究

陈沅江,史志华

Shear Rheological Properties of Sandy Pebble Soil

Yuanjiang CHEN,Zhihua SHI

表2 3种黏弹性流变模型拟合结果比较

Table 2 Comparison of fitting results with three viscoelastic rheological models

模型类别	流变方程	各级剪应力下的R ²
模型类别	流变方程	0.087 MPa	0.116 MPa	0.145 MPa	0.174 MPa	0.203 MPa
五元件模型	$u (t) = [\frac{1}{G_{1}} + \frac{1}{G_{2}} (1 - e^{\frac{- G_{2} t}{η_{1}}}) + \frac{1}{G_{3}} (1 - e^{\frac{- G_{3} t}{η_{2}}})] τ_{0}$	0.9993	0.9992	0.9981	0.9997	0.9997
H-K模型	$u (t) = [\frac{1}{G_{1}} + \frac{1}{G_{2}} (1 - e^{\frac{- G_{2} t}{η_{1}}})] τ_{0}$	0.9189	0.9761	0.9714	0.9854	0.9540
Burgers模型	$u (t) = [\frac{1}{G_{1}} + \frac{1}{G_{2}} (1 - e^{\frac{- G_{2} t}{η_{1}}})] τ_{0} + \frac{τ_{0}}{η_{2}} t$	0.9382	0.9207	0.9717	0.9878	0.9977