高应力下干砂与饱和砂单剪特性比较

在自行改造、加工的高应力单剪仪试验系统上，对饱和粗砂、干粗砂、饱和细砂、干细砂与钢材、混凝土界面的剪切特性进行了正交试验研究．经过对试验数据的回归分析发现，高应力单剪条件下的剪应力．剪切位移关系曲线段与双曲线模型较一致．干砂界面的初始剪切刚度和界面抗剪强度均大于同基底下饱和砂界面的值．通过对试验数据的方差分析知，相对于土性和基底材料两影响因素，砂的干湿状态对剪切特性的影响比较显著．

Comparison of the Simple Shear Property Between Dry and Saturated Sand Under High Stress

The orthogonal tests for interface property between saturated coarse sand, dry coarse sand, saturated fine sand, dry fine sand and steel/concrete were conducted by using the modified and developed simple shear test system. The regressive analysis of experimental data showed that the initial stage of the relation curve between shear stress and shear displacement was in accordance with the hyperbolic model. The initial shear stiffness and interface shear strength of the dry sand interface were larger than those of saturated sand interface. Through the variance analysis, a conclusion is drawn that the situation （dry or saturated） of sand has more significant effect on the interface property than the soil type and interface base.