Experimental research on static mechanical properties of cement-improved argillite-slate coarse-grained soil under drying-wetting cycles

被引：1

作者：

Liu Y. ^{[1
,2
]}

Zhu Z. ^{[1
]}

Chen J. ^{[3
]}

机构：

[1] School of Geosiences and Info-Physics, Central South University, Changsha

[2] Research Institute of Hunan Provincial Nonferrous Metals Geological Exploration Bureau, Changsha

[3] School of Civil Engineering, Central South University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Coarse-grained soil improved by cement; Confining pressure; Drying-wetting cycle; Large tri-axial compressive test; Soil mechanics; Standard curing age;

D O I：

10.11817/j.issn.1672-7207.2019.03.022

中图分类号：

学科分类号：

摘要：

In order to research drying-wetting cycle effects on static mechanical properties of cement-improved argillite- slate coarse-grained soil, large tri-axial compression tests were conducted on the cement-improved soil samples with over 28 d of the standard curing ages when the samples were subjected to drying-wetting cycles. Changes of the axial maximum stress difference, internal friction angle, cohesion and elastic modulus of the samples with the drying-wetting cycle indexes were obtained by the tests. On that basis, the relationship between the changes and confining pressure as well as that between the changes and standard curing age were analyzed. The results show that with the increase of the drying-wetting cycle index, mechanical parameters such as the axial maximum stress difference, the internal friction angle, the cohesion and the elastic modulus of the soil all decay until they become stable. The decay of the internal friction angle in drying-wetting cycles is smaller than that of the other mechanical parameters. With the increase of the confining pressure, the decay of both the axial maximum stress difference and elastic modulus decrease in drying-wetting cycles. The decay of the axial maximum stress difference and cohesion in drying-wetting cycles decrease with the increase of the standard curing age, while the decay of both elastic modulus and internal friction angle are almost unaffected by standard curing age. © 2019, Central South University Press. All right reserved.

引用

页码：679 / 686

页数：7

共 21 条

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