Estimation of compression behavior of granular soils considering initial density effect based on equivalent concept

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yiwen Zeng, Xiusong Shi, Jidong Zhao, Xia Bian, Jiaying Liu
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引用次数: 0

Abstract

Compressibility of granular materials depends on its initial density and is significantly affected by particle breakage, especially at high stress levels. In this study, a simple compression model for granular soils is proposed by incorporating a new equivalent concept. The initial density effect on the curvature of compression line is captured by a novel equivalent void ratio, which features a state variable for describing the evolution of grain crushing and corresponding yielding behavior. An Equivalent Compression Curve (ECC) is further established by directly implementing the equivalent void ratio into a reference compression curve. Validation has been done by comparing the simulated curves with the test data from available literature. It reveals a good linear relationship between the state variable and breakage index. Moreover, the ECC can well normalize the compression behavior of granular soils with a wide range of initial densities and stress levels. The simplified version of ECC includes only three parameters which are consistent with the reference model. The proposed model provides a basis for establishing versatile and rigorous hardening law that can be readily used in conjunction with the general elasto-plasticity theory.

Abstract Image

基于等效概念的考虑初始密度效应的颗粒土压缩特性估计
颗粒材料的可压缩性取决于其初始密度,并受到颗粒破碎的显著影响,特别是在高应力水平下。本文通过引入一个新的等效概念,提出了一个简单的颗粒土压缩模型。初始密度对压缩线曲率的影响由一种新的等效孔隙比来描述,该等效孔隙比具有描述颗粒破碎和相应屈服行为演变的状态变量。通过将等效孔隙率直接引入参考压缩曲线,进一步建立等效压缩曲线(ECC)。通过将模拟曲线与现有文献的试验数据进行比较,验证了所得到的结果。结果表明,状态变量与断裂指数之间存在良好的线性关系。此外,ECC可以很好地规格化颗粒土在大范围初始密度和应力水平下的压缩行为。简化后的ECC只包含三个参数,与参考模型一致。该模型为建立通用的、严格的硬化规律提供了基础,可与一般弹塑性理论相结合。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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