In this study, the effects of different shear rates during direct shear tests on variations in the strength characteristics were investigated for the sand samples of various particle size distribution. Direct shear tests were carried out at nine different shear rates ranging from 0.05 to 5 mm/min under normal stresses of 54.5, 109, and 218 kPa. Both sample groups were tested under a condition of defined water content and in a water-filled condition. Results show that with increasing shear rate, the internal friction angle and peak shear strength values increased. The increase in the internal friction angles and peak shear strengths were particularly evident for shear rates higher than 1 mm/min. Even though the effect of grain size on the variation in strength parameters due to shear rate is limited for the soils examined in this study, the effect should be considered.

在这项研究中，研究了各种粒径分布的砂样品在直接剪切试验期间不同剪切速率对强度特性变化的影响。在54.5、109和218 kPa的法向应力下，以0.05至5 mm / min的九种不同剪切速率进行直接剪切测试。在规定的水含量和充满水的条件下测试两个样品组。结果表明，随着剪切速率的增加，内摩擦角和峰值剪切强度值增大。当剪切速率高于1 mm / min时，内摩擦角和峰值剪切强度的增加尤为明显。即使在这项研究中，对于剪切速率引起的晶粒尺寸对强度参数变化的影响是有限的，