Effect of microstructure on shear strength and dilatancy of unsaturated loess at high suctions

被引:53
|
作者
Ng, Charles Wang Wai [1 ]
Sadeghi, Hamed [2 ]
Jafarzadeh, Fardin [2 ]
Sadeghi, Mohammad [2 ]
Zhou, Chao [3 ]
Baghbanrezvan, Sina [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[2] Sharif Univ Technol, Dept Civil Engn, Tehran, Iran
[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
loess; microstructure; dilatancy; high suction; void ratio; ELASTOPLASTIC MODEL; CONSTITUTIVE MODEL; COLLAPSE BEHAVIOR; STATE; SOIL; STRESS; EQUILIBRIUM; COMPRESSION; CLAY;
D O I
10.1139/cgj-2018-0592
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
To investigate the influences of microstructure changes on dilatancy of unsaturated loess at high suctions, a direct shear box device using the vapour equilibrium technique was used. Through conducting two series of direct shear tests on both intact and recompacted loess specimens and also investigating microstructural changes using the mercury intrusion porosimetry (MIP) technique, a linear increase in dilatancy with suctions ranging from 8 to 230 MPa can be identified at different net stresses. The enhanced dilatancy observed is mainly attributed to desiccation-induced high suctions as the reduction in void ratio due to enhancement of suction was negligible. A macrovoid ratio, e(M), may be quantified and proposed to explain the differences in the increased dilatancy of recompacted and intact loess with suction.
引用
收藏
页码:221 / 235
页数:15
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