The shear behavior of saturated loess was examined by performing a series of ring shear tests with different shearing rates. The effects of shearing rates on the shear behavior of saturated loess with different normal stress are presented and discussed. The results showed that peak shear strength and steady-state shear strength were greater when the shearing rate was low and vice versa. Compared with high and low shearing rates, the maximum strength reduction ratios of peak shear strength and steady-state shear strength were 34.2% and 37.2%, respectively. The axial displacement during shearing was measured and was found to increase with increasing shear displacement in all tests. A comparison of sample height reduction (when the shear rate was stopped) found that the low shearing rate test sample underwent a much greater reduction than the high shearing rate test sample; however, the variation reduction range was within 4 mm. Monitoring the pore-water pressure during the shearing process revealed that it increased with shear displacement, and a higher excess pore-water pressure was generated within the shear zone during the fast-shearing process. Comparing the particle size distribution of the samples after the test and the original sample showed that the particles were crushed during the shearing process. The percentage that was finer than 0.005 mm increased with shearing rates and normal stress, and the soil structure implosion became more pronounced with increasing normal stress.

中文翻译：

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使用环形剪切试验，高剪切速率对饱和黄土剪切行为的影响

饱和黄土的剪切行为通过一系列不同剪切速率的环剪试验来检验。介绍并讨论了剪切速率对不同法向应力下饱和黄土剪切行为的影响。结果表明，当剪切速率较低时，峰值剪切强度和稳态剪切强度较大，反之亦然。与高、低剪切速率相比，峰值剪切强度和稳态剪切强度的最大强度折减率分别为34.2%和37.2%。测量了剪切过程中的轴向位移，发现在所有测试中都随着剪切位移的增加而增加。对样品高度减少量（当剪切速率停止时）的比较发现，低剪切速率测试样品比高剪切速率测试样品经历了更大的降低；然而，变化减少范围在 4 毫米以内。对剪切过程中孔隙水压力的监测表明，它随着剪切位移的增加而增加，并且在快速剪切过程中剪切带内产生了更高的超孔隙水压力。比较试验后样品和原始样品的粒度分布表明，颗粒在剪切过程中被压碎。小于 0.005 mm 的百分比随着剪切速率和正应力的增加而增加，并且随着正应力的增加，土壤结构内爆变得更加明显。变化减少范围在 4 毫米以内。对剪切过程中孔隙水压力的监测表明，它随着剪切位移的增加而增加，并且在快速剪切过程中剪切带内产生了更高的超孔隙水压力。比较试验后样品和原始样品的粒度分布表明，颗粒在剪切过程中被压碎。小于 0.005 mm 的百分比随着剪切速率和正应力的增加而增加，并且随着正应力的增加，土壤结构内爆变得更加明显。变化减少范围在 4 毫米以内。对剪切过程中孔隙水压力的监测表明，它随着剪切位移的增加而增加，并且在快速剪切过程中剪切带内产生了更高的超孔隙水压力。比较试验后样品和原始样品的粒度分布表明，颗粒在剪切过程中被压碎。小于 0.005 mm 的百分比随着剪切速率和正应力的增加而增加，并且随着正应力的增加，土壤结构内爆变得更加明显。在快速剪切过程中，剪切带内产生了较高的超孔隙水压力。比较试验后样品和原始样品的粒度分布表明，颗粒在剪切过程中被压碎。小于 0.005 mm 的百分比随着剪切速率和正应力的增加而增加，并且随着正应力的增加，土壤结构内爆变得更加明显。在快速剪切过程中，剪切带内产生了较高的超孔隙水压力。比较试验后样品和原始样品的粒度分布表明，颗粒在剪切过程中被压碎。小于 0.005 mm 的百分比随着剪切速率和正应力的增加而增加，并且随着正应力的增加，土壤结构内爆变得更加明显。