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Pre-shear effect on liquefaction resistance of a Fujian sand

机译：预剪切对福建砂抗液化性能的影响

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Pre-shear history has been shown to be a critical factor in the liquefaction resistance of sand. By to prior experimental studies in which triaxial shear tests were used to examine the effects of pre-shear on the liquefaction resistance of sand, hollow cylinder torsional shear tests were used in this study to avoid the influence of the inherent anisotropy that is inevitably produced during the sample preparation process because of gravitational deposition. A series of cyclic undrained shear tests were performed on sand samples that had experienced medium to large pre-shear loading. The test results showed that the liquefaction resistance of sand can be greatly reduced by its pre-shear history, and a pre-shear strain within the range from 0.1% to 5% can cause sand to be more prone to liquefaction. During the cyclic shear tests, the samples that had experienced pre-shear loading exhibited different behaviors when cyclic shear loading started in different directions, i.e., the clockwise direction and the counterclockwise direction. If the cyclic loading started in the identical direction as the pre-shear loading, then the mean effective stress of the sand was almost unchanged during the first half of the loading cycle; if the cyclic loading started in the direction opposite to that of the pre-shear loading, then the mean effective stress decreased significantly during the first half of the loading cycle. However, this anisotropic behavior was only remarkable during the first loading cycle. From the second cycle onward, the speeds of the decrease in the mean effective stresses in the two types of shear tests became similar. (C) 2015 Elsevier Ltd. All rights reserved.
机译：剪切前的历史已被证明是影响砂土抗液化性的关键因素。通过先前的试验研究（其中使用三轴剪切试验来检查预剪切对砂土的抗液化性的影响），在本研究中使用了空心圆柱体扭转剪切试验来避免不可避免地产生固有各向异性的影响。样品制备过程中由于重力作用而沉积。对经历了中等至较大的预剪切载荷的砂土样品进行了一系列的循环不排水剪切测试。试验结果表明，砂的抗剪切性可大大降低其抗液化性，并且在0.1％至5％范围内的抗剪切应变会使砂更易于液化。在循环剪切试验期间，当循环剪切载荷沿不同方向即顺时针方向和逆时针方向开始时，经历了预剪切载荷的样品表现出不同的行为。如果循环荷载开始于与剪切前荷载相同的方向，那么在荷载循环的前半段，砂子的平均有效应力几乎不变；如果周期性载荷开始于与剪切前载荷相反的方向，则平均有效应力在载荷周期的前半段显着下降。但是，这种各向异性行为仅在第一个加载周期中才显着。从第二个周期开始，两种剪切测试中平均有效应力的减小速度变得相似。 （C）2015 Elsevier Ltd.保留所有权利。

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