饱和砂土蠕变特性实验

为证实和进一步了解砂土蠕变规律,利用室内改装的应力控制式三轴仪研究饱和砂土排水蠕变特性.实验结果表明:砂土蠕变受围压和密实度的影响较大,低围压下,砂样更易发生剪胀;密实砂蠕变变形量明显比中密砂小,密实砂比中密砂更易剪胀;侧向减载条件比轴向加载更易剪胀;在应力水平不超过0.8的情况下,Mesri蠕变模型对砂土蠕变规律拟合效果较好.

Experimental Investigation of Creep Properties of Saturated Sand

In order to verify and investigate further the sandy soil creep properties, the stress-controlled triaxial apparatuses are used to study the drainage creep of saturated sand. The result shows that the creep of saturated sand is significantly affected by confining pressure and dense degree. Under low confining pressure, the sample shear dilatancy occurs easily. The creep deformation of dense sand is significantly smaller than the deformation of middle dense sand, the dense sand shear dilatancy occurs more frequently by comparison with middle dense sand. When the stress level is less than 0.8, the Mesri creep model is fitted well for sandy soil creep.