论文部分内容阅读
针对南宁膨胀土进行一系列室内剪应力松弛试验,探讨南宁非饱和重塑膨胀土在直剪条件下的剪应力松弛特性。试验结果表明:在不同含水率条件下的剪应力松弛曲线均属于非完全衰减型,剪应力逐渐减少并趋于一个稳定值;松弛曲线可以明显地分为三个阶段:加速松弛阶段、匀速松弛阶段和稳定松弛阶段;含水率越高,应力-应变等时关系曲线的非线性程度越大,土体达到破坏的位移值越小。建立的K-H体本构方程的拟合曲线与实测曲线有较好的拟合度,表明该本构模型能较好地反映南宁非饱和重塑膨胀土的剪应力松弛特性。
Nanning expansive soil for a series of indoor shear stress relaxation tests to explore Nanning unsaturated remolded expansive soil shear stress relaxation characteristics under shear conditions. The experimental results show that the shear stress relaxation curves under different water contents all belong to the non-complete attenuation type, the shear stress decreases gradually and tends to a stable value. The relaxation curve can be obviously divided into three stages: acceleration relaxation phase, uniform relaxation Stage and stable relaxation stage. The higher the water content, the greater the nonlinearity of the stress-strain isochronous curve and the smaller the displacement value of the soil to damage. The established fitting curve of K-H body constitutive equation has a good fitting degree with the measured curve, indicating that the constitutive model can well reflect the shear stress relaxation characteristics of Nanning unsaturated remolded expansive soil.