Ab'/> Influence of shear stress level on cyclic deformation behaviour of intact Wenzhou soft clay under traffic loading
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Influence of shear stress level on cyclic deformation behaviour of intact Wenzhou soft clay under traffic loading

机译：剪切应力水平对交通负荷完整温州软粘土的循环变形行为的影响

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AbstractUnder traffic loading, the soil elements in subgrade are subjected to a cyclic cardioid-shaped stress path in the 2τvh~(σv?σh) stress plane. This significantly differs from the conventional stress paths that have been simulated using the cyclic triaxial and simple shear apparatuses, as widely reported in the literature. To date, the influence of shear stress level on cyclic deformation behaviour of intact soft clay subjected to cyclic traffic loading were rarely considered in the existing experimental investigation. For this reason, a series of cyclic hollow cylinder experiments that mimic cardioid-shaped stress paths are carried out on intact samples of Wenzhou soft clay. A wide range of vertical stress levels combined with different shear stress levels (i.e., different cardioid-shaped stress paths) are simulated in the experiments. The results show that the shear stress level significantly influences the cyclic straining and exacerbates the potential of cyclic shear failure. The difference of cyclic tests with variable shear stress level increases as the vertical cyclic stress ratio value increases. Based on the test results, an allowable cyclic stress ratio is determined to be about 0.22, which may serve as the upper bound limit of cyclic traffic loadings on soft clayey deposit. For the hollow cylinder specimens used in this study, a resilient axial strain of 3% could be a proper failure criteria value. A simplified permanent strain model that considers shear stress is proposed for the deformation behaviour of soft clay under cyclic traffic loading.Highlights?Static and cyclic tests are conducted on natural clay by hollow cylinder apparatus.?The shear stress level has significant effect on the development of strain.?An allowable cyclic stress ratio is determined for design criterion of pavement.?Experimental model considering principal stress rotation for permanent strain.]]>
机译：<！[cdata [ 抽象 在流量负载下，路基中的土壤元素在2 <1中进行循环心形应力路径CE：斜体>τ vh 〜（σ v ？σ h ）压力平面。这与使用循环三轴和简单的剪切装置进行模拟的传统应力路径显着不同，如文献中的广泛报道。迄今为止，在现有的实验研究中，很少考虑剪切应力水平对受循环交通负荷进行的完整软粘土的循环变形行为的影响。因此，在温州软粘土的完整样品上进行了一系列循环中空圆柱实验，即模仿心形应力路径。在实验中模拟了各种垂直应力水平与不同的剪切应力水平（即，不同的心形应力路径）进行模拟。结果表明，剪切应力水平显着影响环状紧张，加剧循环剪切失效的潜力。随着可变剪切应力水平的循环测试的差异随着垂直循环应力比增加而增加。基于测试结果，允许的循环应力比确定为约0.22，这可以用作软粘土沉积物上的循环交通载量的上限极限。对于本研究中使用的空心圆柱样本，弹性轴向应变为3％可能是适当的失效标准值。提出了一种简化的永久性应变模型，用于在循环交通负载下进行软粘土的变形行为。 亮点 ？ 静态和循环试验通过空心圆柱装置在天然粘土上进行。 ？ 剪切应力水平对应变的发展具有显着影响。 ？ 允许的循环应力rati o确定路面的设计标准。 ？ 考虑永久应变主应力旋转的实验模型。 ]]>

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