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Influence of mineral dissolution on the mechanical behaviour of a granular assembly under complex stress states
C. Chen1; L. M. Zhang2; P. Shen3
2020-12
Source PublicationINTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
ISSN1365-1609
Volume136
Abstract

Rock and soil are natural assemblies of mineral grains. Dissolution of mineral compositions in a granular assembly can dramatically disturb and change the microstructure. Once the soil fabric and inter-particle contacts change, large deformations can develop and the shear strength can decrease. Currently there is a lack of understanding and experimental evidence of geomaterial behaviour subjected to mineral dissolution under realistic complex stress conditions. In this experimental study, extensive laboratory tests were conducted to investigate changes in the stress-strain relation, shear strength and critical state of a granular assembly after experiencing a substantial loss of particles by salt dissolution. During the salt dissolution process, a larger shear stress or confining pressure leads to a smaller increase of void ratio, a smaller positive state parameter, and a weaker strain-hardening behaviour. After the salt dissolution, the material grading becomes narrower, the grading state index decreases and the specific void ratio increases, leading to an upward shift of the critical state line. However, the increase of void ratio is more than the upward shift of the critical state line, thus the stress state changes from the dense side to the loose side, accompanied by a change of shearing behaviour from strain-softening to strain-hardening. Nevertheless, as the critical friction angle is dominated by the inter-particle contacts among coarse particles, with almost no change in the coarse content of the post-dissolution materials, only a slight decrease of 2.3° in the critical friction angle is found.

KeywordCritical State Particle Removal Salt Dissolution Shear Strength Stress State Stress-strain Behaviour
DOI10.1016/j.ijrmms.2020.104546
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Mining & Mineral Processing
WOS SubjectEngineering, Geological ; Mining & Mineral Processing
WOS IDWOS:000599913300001
Scopus ID2-s2.0-85096189867
Fulltext Access
FWCI0.5182842
Citation statistics
Document TypeJournal article
CollectionUniversity of Macau
Faculty of Science and Technology
THE STATE KEY LABORATORY OF INTERNET OF THINGS FOR SMART CITY (UNIVERSITY OF MACAU)
Corresponding AuthorL. M. Zhang
Affiliation1.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, No. 24 South Section 1, Yihuan Road, 610065, China
2.Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong
3.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macao, China
Recommended Citation
GB/T 7714
C. Chen,L. M. Zhang,P. Shen. Influence of mineral dissolution on the mechanical behaviour of a granular assembly under complex stress states[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2020,136.
APA C. Chen,L. M. Zhang,&P. Shen.(2020).Influence of mineral dissolution on the mechanical behaviour of a granular assembly under complex stress states.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,136.
MLA C. Chen,et al."Influence of mineral dissolution on the mechanical behaviour of a granular assembly under complex stress states".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 136(2020).
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