Abstract
In order to study the influence of water–rock interaction on the mass time-varying characteristics of coal rocks, coal was selected as the research object and subjected to chemical immersion tests with different pH aqueous solutions for 12 days. By experiment, the time-varying patterns of mass change fraction in coal samples, pH value in solution, and ions concentration of calcium and magnesium were obtained. Based on the gray correlation theory, the correlation degree between the mass change fraction and four influencing factors was analyzed. The gray prediction models for the mass time-varying characteristics of coal rocks have been established. The research shows that: (1) the influence ways and degree of different pH aqueous solutions on the mass changes of coal rocks are different, (2) during the process of water–rock interaction, the change law of pH value, ions concentration of calcium and magnesium in solution are obvious, (3) the multiple regression models can be used to predict the mass change of coal rocks accurately under water–rock interaction.
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Abbreviations
- m 0 :
-
Initial mass(g)
- m d :
-
Instant mass(g)
- ρ 0 :
-
Density(kg·m−3)
- v 0 :
-
Initial sound velocity(m·s−1)
- t :
-
Soaking days
- h :
-
Height (mm)
- d :
-
Hiameter (mm)
- a :
-
Instant pH value
- η :
-
Mass change fraction
- b 2, b 3, b 4, b 5, a :
-
Parameters to be determined
- c 1 :
-
Instant calcium ions concentration (mol·L−1)
- c 2 :
-
Instant magnesium ions concentration (mol·L−1)
- R :
-
Correlation coefficient
- P :
-
Probability value that the correlation coefficient is zero
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Acknowledgements
This work was supported by the Key Project of National Natural Science Foundation of China (52034007), the Open Fund Project of the State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM19KF013), and the National Undergraduate Practice and Innovation Training Program (202110320013Z).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ZY, SL, YL, and NZ. The first draft of the manuscript was written by ZY and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Yang, Z., Li, S., Liu, Y. et al. Experimental study on the influence of water–rock interaction on the time-varying characteristics of coal rock mass. Environ Geochem Health 46, 45 (2024). https://doi.org/10.1007/s10653-023-01832-0
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DOI: https://doi.org/10.1007/s10653-023-01832-0