Effects of dry density and water content on compressibility and shear strength of loess

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Ye-xia Guo, W. Ni, Haisong Liu
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引用次数: 6

Abstract

Investigation on the compressibility and shear strength of compacted loess is of great importance for the design and operation of engineering infrastructures in filling area. In this study, the mechanical behaviors of Yan'an compacted loess are investigated at various dry densities and water contents by conducting one dimensional compression and direct shear tests. And the elastic compressibility, plastic compressibility, yield stress and strength are obtained from the experiments. Results show that when water content increases, plastic compressibility parameter increases, but yield stress decreases. However, the increase of dry density leads to a decrease in plastic compressibility parameter but an increase in yield stress. In addition, elastic compressibility parameter is found to be a constant which is irrelevant to water content and dry density. As for strength, cohesion and internal friction angle is directly proportional to dry density, but inversely proportional to water content. Moreover, the mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM) tests were also performed to observe the pore size distribution and microstructure of the specimens. Finally, by using results of MIP and SEM tests, the compressibility and strength behaviours of Yan'an compacted loess are explained from the perspective of pore-size distribution and microstructure.
干密度和含水量对黄土压缩性和抗剪强度的影响
研究压实黄土的抗压性和抗剪强度对填筑区工程基础设施的设计和运行具有重要意义。通过一维压缩和直剪试验,研究了延安压实黄土在不同干密度和含水量下的力学行为。通过实验得到了材料的弹性压缩率、塑性压缩率、屈服应力和强度。结果表明:随着含水量的增加,塑性压缩系数增大,屈服应力减小;干密度的增大导致塑性压缩系数的减小,而屈服应力的增大。此外,发现弹性压缩系数是一个常数,与含水量和干密度无关。强度方面,黏聚力和内摩擦角与干密度成正比,与含水量成反比。采用压汞法(MIP)和扫描电镜(SEM)观察了试样的孔径分布和微观结构。最后,利用MIP和SEM测试结果,从孔隙尺寸分布和微观结构的角度解释了延安压实黄土的压缩性和强度特性。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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