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A constitutive model for crushable sands involving compression and shear induced particle breakage
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.compgeo.2020.103757
Zhaonan Wang , Gang Wang , Qinguo Ye

Abstract Properly modelling the particle breakage characteristics is important for crushable soils such as carbonate sands, rockfills and rail ballasts. According to the generation mechanism, particle breakage was decomposed into two parts: compression-induced particle breakage associated with the increase of mean effective stress and shear-induced particle breakage related to the change of shear stress ratio. The accumulation rate of the compression-induced particle breakage can be well correlated to the current stress state; while the accumulative rate of the shear-induced particle breakage depends on both the current stress state and the accumulated amount of particle breakage during past loading histories. Within the framework of the critical state plasticity, a double yield surfaces constitutive model incorporating the two particle breakage components was developed. By employing a breakage critical state surface with particle breakage being an extra dimension, the effect of particle breakage on the critical state, dilatancy, strength and modulus were involved. The drained and undrained triaxial test results of two carbonate sands and one silica sand of different densities were selected to validate the proposed model. It was shown that the proposed model is capable to reproduce well the stress-strain behavior of the crushable soils.

中文翻译:

涉及压缩和剪切引起的颗粒破碎的可压碎砂的本构模型

摘要 正确模拟颗粒破碎特性对于碳酸盐砂、堆石料和铁路道碴等可压碎土壤非常重要。根据产生机制,颗粒破碎分为两部分:与平均有效应力增加相关的压缩诱导颗粒破碎和与剪切应力比变化相关的剪切诱导颗粒破碎。压缩引起的颗粒破碎的累积速率可以与当前的应力状态很好地相关;而剪切引起的颗粒破碎的累积率取决于当前的应力状态和过去加载历史中颗粒破碎的累积量。在临界状态可塑性的框架内,开发了包含两个颗粒破碎分量的双屈服面本构模型。通过采用破碎临界状态表面,颗粒破碎是一个额外的维度,颗粒破碎对临界状态、剪胀性、强度和模量的影响被涉及。选择两种不同密度碳酸盐砂和一种硅砂的排水和不排水三轴试验结果来验证所提出的模型。结果表明,所提出的模型能够很好地再现可压碎土的应力应变行为。选择两种不同密度碳酸盐砂和一种硅砂的排水和不排水三轴试验结果来验证所提出的模型。结果表明,所提出的模型能够很好地再现可压碎土的应力应变行为。选择两种不同密度碳酸盐砂和一种硅砂的排水和不排水三轴试验结果来验证所提出的模型。结果表明,所提出的模型能够很好地再现可压碎土的应力应变行为。
更新日期:2020-10-01
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