In this study, to explore the feasibility of a compacted red clay as an engineered barrier in landfills, the viscoplastic property of remodeled unsaturated reticulate red clay was studied through a series of triaxial tests. According to the deviatoric stress–axial strain curves obtained through loading tests with varying strain rates and under different conditions, the viscoplastic parameter β of remodeled reticulate red clay was obtained. The effects of different matric suctions and net confining pressures on the viscoplasticity of unsaturated reticulate clay were analyzed. The test results showed that remodeled reticulate red clays with different degrees of saturation have similar viscoplastic properties, and their stress–strain curves are all isotach. The stiffness of unsaturated reticulate red clay increased with increasing confining pressure and matric suction. The relationship between β and the net confining pressure can be described using a linear equation. The β value of the specimens increased with increasing matric suction under a constant net confining pressure. A similar linear relationship was observed between β and the matric suction. These relationships are explained considering the loading rate effect mechanism.

中文翻译：

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不饱和网状红粘土作为工程屏障的粘塑性试验研究

在这项研究中，为了探索压实红粘土作为垃圾填埋场工程屏障的可行性，通过一系列三轴试验研究了改造不饱和网状红粘土的粘塑性。根据不同应变率和不同条件下加载试验得到的偏应力-轴向应变曲线，得到了重塑网状红土的粘塑性参数β。分析了不同基质吸力和净围压对非饱和网状粘土黏塑性的影响。试验结果表明，不同饱和度的改造网纹红粘土具有相似的粘塑性，其应力-应变曲线均为等距曲线。不饱和网状红土的刚度随着围压和基质吸力的增加而增加。β 与净围压之间的关系可以使用线性方程来描述。在恒定的净围压下，试样的β值随着基体吸力的增加而增加。在 β 和基质吸力之间观察到类似的线性关系。考虑加载速率效应机制来解释这些关系。