Abstract

Depending on the characteristics of soil particles and external load, natural soils often undergo particle breakage which may significantly influence their mechanical behavior. In this study, a hypoplastic model is proposed to describe the sand behavior over a wide range of stress levels, especially those sufficient to cause particle breakage. The characterized void ratios and granulate hardness of the model are related to the plastic work to reflect the impact of particle breakage on the strength and deformation properties of sand. The influence of confining pressure on the extent of particle breakage is properly considered. The model is demonstrated to be capable of simulating the response of crushable sand under various test conditions. The simulation results of the original hypoplastic model are also presented, which indicates that neglecting the particle breakage may cause unreasonable predictions at high stress state.

中文翻译：

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各种应力水平下可压碎砂的亚塑性模型

摘要

根据土壤颗粒的特性和外部载荷，天然土壤经常发生颗粒破碎，这可能会显着影响其力学行为。在这项研究中，提出了一个亚塑性模型来描述沙子在各种应力​​水平下的行为，特别是那些足以导致颗粒破碎的应力水平。模型表征的空隙率和颗粒硬度与塑性功相关，反映颗粒破碎对砂的强度和变形性能的影响。适当考虑了围压对颗粒破碎程度的影响。该模型被证明能够模拟可破碎砂在各种测试条件下的响应。还给出了原始亚塑性模型的模拟结果，这表明忽略颗粒破碎可能会导致高应力状态下的不合理预测。