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首页> 外文期刊>International journal of soil science >Effects of Variable Angular Velocities and Soil Moisture Contents on Undrained Shear Strength in a Sandy Loam Soil (Eutric Leptosol)
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Effects of Variable Angular Velocities and Soil Moisture Contents on Undrained Shear Strength in a Sandy Loam Soil (Eutric Leptosol)

机译：变角速度和土壤含水量对砂壤土（淡水细沙）不排水抗剪强度的影响

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The study discusses the empirical derivation of undrained shear strength S_(und) from vane tests and compared this to those derived from predictions under the influence of both angular velocity (co) and Soil Moisture Content (SMC) percentage. The study conducted on partially and fully saturated samples of sandy loam soil (Eutric leptosol) evaluated the effects of three different angular velocities and Soil Moisture Contents (SMCs) on the S_(und), using a pocket vane tester. The angular velocities used in this study were 7.2, 3.6 and 1.8 deg sec~(-1), which corresponded to rotation rates of 5,10 and 20 sec per 0.1 kg cm~(-2), respectively. The results showed that S_(und) positively correlated with time to failure (t_f) irrespective of change in the angular velocity and negatively correlated with both (omega) and SMC, which both were best described using a power function:S_(und) = LAMBDA THETA~(-beta). The S_(und) was constant at any given SMC regardless of variations in angular velocity however, theS_(und) decreased with increase in SMC suggesting that S_(und) was largely controlled by SMC and less by w. Decoupling the torque into the cylindrical and horizontal shear components showed that the shear resistance generated by the cylindrical or vertical torque (T_v) was more or less constant around 0.1 kg cm~(-2) till failure, whereas the shear resistance generated by the horizontal torque (T_h) was variable at about 0.3 kg cm~(-2). On average, the T_h was three times the T_v, while the measured S_(und) was overestimated by about 40% higher than the predicted S_(und).
机译：该研究讨论了从叶片试验得出的不排水抗剪强度S_（und）的经验推导，并将其与在角速度（co）和土壤水分含量（SMC）百分比的影响下从预测推导的推导进行了比较。使用袋装叶片测试仪，对部分和完全饱和的沙壤土样品（Eutric钩端藤）进行了研究，评估了三种不同的角速度和土壤水分含量（SMC）对S_（und）的影响。本研究中使用的角速度分别为7.2、3.6和1.8度sec-（-1），分别对应于每0.1 kg cm-（-2）5,10和20 sec的旋转速度。结果表明，无论角速度如何变化，S_（und）与失效时间（t_f）均呈正相关，而与ω和SMC则呈负相关，这两者均可以通过幂函数进行最佳描述：S_（und）= LAMBDA THETA〜（-beta）。在任何给定的SMC中，S_（und）都是恒定的，而与角速度的变化无关，但是，随着SMC的增加，S_（und）减小，这表明S_（und）在很大程度上由SMC控制，而由w控制。将扭矩分离为圆柱和水平剪切分量可知，直到破坏，圆柱或垂直扭矩（T_v）产生的剪切阻力大约在0.1 kg cm〜（-2）左右恒定，而水平或水平方向产生的剪切阻力基本不变。扭矩（T_h）大约在0.3 kg cm〜（-2）之间变化。平均而言，T_h是T_v的三倍，而测得的S_（und）被高估了比预测的S_（und）高约40％。

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