Mathematical model based on the gradation equation for predicting gradation evolution of coarse-grained soils

被引：3
|
作者：
Guo W. [1 ]
Zhu J. [1 ]
Wang Q. [2 ]
Yu T. [2 ]
机构：
[1] Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing
[2] Chengdu Survey and Design Institute Limited, Power Construction Corporation of China, Chengdu
来源：
Zhu, Jungao (zhujungao@hhu.edu.cn) | 2018年 / Central South University of Technology卷 / 49期
基金：
中国国家自然科学基金;
关键词：
Coarse-grained soil; Gradation equation; Gradation evolution; Particle crushing; Triaxial test;
D O I：
10.11817/j.issn.1672-7207.2018.08.030
中图分类号：
学科分类号：
摘要：
In order to study the evolution law of gradation for coarse-grained soils, a mathematical model describing the relationship between stress and strain state, breakage indicators and gradation(SBG model) was established. Firstly, a gradation equation in which the two gradation parameters were named b and m was proposed to describe the grain size distribution(GSD) curve. Then, a new grain breakage indicator BW was defined. Together with another breakage indicator Bg, they were both suggested as the two required breakage indicators for the proposed model. On one hand, the relationship between BW and Bg and the gradation parameters b and m were derived and verified. On the other hand, an empirical equation of BW and Bg and confining pressure at the failure of the specimens, and an empirical equation of BW and Bg and the mean normal stress and general shear strain during shearing of the specimens were proposed. The SBG model was thereby established by combining the above two parts. The results show that the proposed SBG model can be used to predict change of breakage indicators and GSD of coarse-grained soils with stress and strain states in triaxial test. © 2018, Central South University Press. All right reserved.
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页码：2076 / 2082
页数：6
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