Abstract
Cemented gangue backfill technology is beneficial to the reuse of solid waste and sustainable economic development. However, mine water has a great impact on the strength and deformation of cemented gangue backfill (CGB). In this study, the CGB specimens under load were placed in simulated acid mine water (H2SO4 solution). The changes in deformation, resistivity, and ultrasonic pulse velocity (UPV) of CGB were monitored. On the 360th day, the stress–strain curve and acoustic emission (AE) energy of the specimen during loading were recorded. The degradation mechanism of CGB was discussed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results showed that the deformation of CGB increased with time. The effect of H2SO4 solution concentration on the deformation was different in the early and late stages. Applying an 80% stress-strength ratio (SSR) reduced the strength and increased the deformation. The UPV and resistivity had different characteristics at different corrosion ages, which could be used for long-term stability monitoring of CGB. The CGB showed the strongest AE energy characteristics near the peak stress. The AE energy decreased with the increase of pH value in the pore compaction stage, and the AE activity of the CGB under 80% SSR was much greater than that of the CGB under 40% SSR. The erosion of the H2SO4 solution on the CGB was inhibited by applying a small load. Excessive load aggravated the erosion deterioration of CGB due to initial plastic damage. The research results can provide a reference for the durability design of CGB.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was sponsored by the National Natural Science Foundation of China (51974192), the Distinguished Youth Funds of National Natural Science Foundation of China (51925402), Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Project (2022SX-TD007), and Shanxi province postgraduate education innovation project (2021Y279).
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Yuxia Guo: administration, conceptualization, funding acquisition, methodology, and writing-review and editing. Yonghui Zhao: experiment, investigation, and writing-original draft. Guorui Feng: funding acquisition, supervision.
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Guo, Y., Zhao, Y. & Feng, G. Creep and strength characteristics of cemented gangue backfill under coupling effect of load and acid corrosion. Environ Sci Pollut Res 30, 97281–97297 (2023). https://doi.org/10.1007/s11356-023-28931-w
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DOI: https://doi.org/10.1007/s11356-023-28931-w