Experimental research on the influence of dry density and moisture content on the shear strength of standard sand

被引：0
|
作者：
Xiao J. [1 ]
Yan W. [1 ]
Qiao S. [2 ]
Xie J. [2 ]
Fang Z. [2 ]
Zhang Z. [2 ]
机构：
[1] Hunan Zhongda Design Institute Co., Ltd, Changsha
[2] School of Civil Engineering, Central South University, Changsha
来源：
Journal of Railway Science and Engineering | 2023年 / 20卷 / 10期
关键词：
dry density; moisture content; shear strength; standard sand; strain softening;
D O I：
10.19713/j.cnki.43-1423/u.T20230768
中图分类号：
学科分类号：
摘要：
The shear strength is not only one of the important mechanical properties of soil, but also a key factor to determine the stability of engineering. The standard sand was selected as the experimental material in order to explore the strength characteristics of sand. Direct shear tests with different levels of moisture content and dry density were designed to clarify the effects of dry density and moisture content on the stress-strain curves of standard sand, and to further reveal the influence law of the two factors on the strength characteristics of standard sand. The results show that the stress required to achieve the same strain of the standard sand in the test increases as the dry density and normal stress of the standard sand increase, while it decreases with the increasing moisture content in each test group. In the direct shear test with the dry density of 1.45 cm3 and the water content of 20% and 25%, the stress-strain curve of standard sand shows the characteristics of strain softening. Further analysis shows that the stress-strain curve of standard sand shows a trend of transition from strain hardening to strain softening with the increase of dry density and the decrease of normal stress. The shear strength of standard sand increases with the increase of dry density and decreases with the increase of moisture content, which is due to internal friction angle. With an increase in dry density, the internal friction angle increases by 0.54°, 2.17°, 1.99° and 0.21° in the experiment with constant water content which shows a gentle-steep-gentle upward trend. The change of internal friction angle decreases from 0.5° for every 1% decrease of water content to 0.3° for every 1% decrease of water content in the experiment with constant dry density which shows a steep-gentle decreasing trend with the increase of moisture content. The results of the research can provide a reference for the study of disaster prevention and early warning of sand-related engineering. © 2023, Central South University Press. All rights reserved.
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页码：3789 / 3797
页数：8
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