Effect of wetting and drying cycles on microstructure of rock based on SEM

To study the effect of periodic water circulation on rock mass, chlorite–amphibolite rocks from the slope of Nanfen open-pit iron mine in Liaoning province were chosen as the engineering samples and were investigated using uniaxial compressive experiment and scanning electron microscopy. The effect...

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Bibliographic Details
Published in:Environmental earth sciences 2019-03, Vol.78 (6), p.1-10, Article 183
Main Authors: Yang, Xiaojie, Wang, Jiamin, Zhu, Chun, He, Manchao, Gao, Yang
Format: Article
Language:English
Subjects:
Amphibolites
Biogeosciences
Chlorite
Compressive strength
Cycles
Drying
Earth and Environmental Science
Earth Sciences
Electron microscopy
Environmental Science and Engineering
Geochemistry
Geology
Geotechnical engineering
Hydrology/Water Resources
Image processing
Iron
Mechanical properties
Microstructure
Original Article
Porosity
Quantitative analysis
Rock
Rock masses
Rock properties
Rocks
Scanning electron microscopy
Stability
Stability analysis
Terrestrial Pollution
Water circulation
Wetting
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Summary:To study the effect of periodic water circulation on rock mass, chlorite–amphibolite rocks from the slope of Nanfen open-pit iron mine in Liaoning province were chosen as the engineering samples and were investigated using uniaxial compressive experiment and scanning electron microscopy. The effect of different wetting and drying cycles on the mechanical properties and microstructure of the rocks was investigated. The characteristics of pore parameters from the SEM images were obtained by Image Pro Plus image processing software. The results show that with the increase in number of wetting and drying cycles, the uniaxial compressive strength of the rock decreases and the porosity increases significantly. The weakening of macroscopic mechanical properties of rocks is closely related to the changes in microstructures of rocks. The water–rock interaction changes the size, shape and porosity of the rock pores and then affects its mechanical properties. Based on the combination of macro and micro, quantitative analysis of the weakening process of rocks subjected to wet and dry cycles can provide a better reference index for evaluating the stability of geotechnical engineering.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-019-8191-6