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Rate dependence on mechanical properties of unsaturated cohesive soil with stress-induced anisotropy

机译：应力诱导各向异性对非饱和粘性土力学性能的速率依赖性

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The strain rate during shearing has been shown in experimental studies to strongly affect the mechanical behaviour of soil. For saturated soil, sufficient knowledge has been obtained to achieve equilibrium conditions for the pore water pressure. Nevertheless, little is known about unsaturated soil. Therefore, this study used a hollow cylindrical torsional shear apparatus to investigate the rate dependence on the deformation and strength properties of unsaturated soil. First, unsaturated specimens were anisotropically consolidated with different directions of major principal stress to assess the rate dependence of the anisotropic behaviour. Then, the shear stress was removed to produce an isotropic stress state. Shearing was applied using the specimens to evaluate the strain rate effects on the mechanical properties of unsaturated cohesive soil. The results indicate that the secant shear modulus increased with the strain rate in both constant suction (CS) and constant water content (CW) conditions. The shear strength did not change with the strain rate under a CW condition, but it decreased with the strain rate under a CS condition. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：实验研究表明，剪切过程中的应变速率会强烈影响土壤的机械性能。对于饱和土壤，已获得足够的知识来实现​​孔隙水压力的平衡条件。然而，对非饱和土壤知之甚少。因此，本研究使用空心圆柱扭转剪切仪研究速率对非饱和土变形和强度特性的依赖性。首先，将各向异性的固结与主要主应力的不同方向进行各向异性固结，以评估各向异性行为的速率依赖性。然后，去除剪切应力以产生各向同性应力状态。使用试样进行剪切，以评估应变速率对非饱和粘性土力学性能的影响。结果表明，在恒定吸力（CS）和恒定水分含量（CW）条件下，割线剪切模量均随应变率的增加而增加。在CW条件下，剪切强度没有随应变率变化，而在CS条件下，剪切强度随应变率而降低。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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