Experimental Study on Damage Properties of Granites Under Flowing Acid Solution

Chen, Wei and Wan, Wen and Zhao, Yanlin and Wu, Qiuhong and He, Huan and Peng, Wenqing and Wu, Xiaofan and Zhou, Yu and Wu, Li and Xie, Senlin (2022) Experimental Study on Damage Properties of Granites Under Flowing Acid Solution. Frontiers in Earth Science, 10. ISSN 2296-6463

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Abstract

In order to study the deterioration characteristics of the tunnel surrounding rock under the scouring of flowing groundwater, we ratioed similar acidic solutions based on groundwater composition. The microstructure of granite samples cored on site, deformation features, and evolution characteristics of mechanical parameters under saturations with different flow rates and various pH values were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD). The results indicate the following: 1) compared with the static water condition, the higher flow rate produces greater relative changes in granite’s microstructure, porosity, mass, and pH of the immersed solution. Moreover, the rate of change is relatively fast in the early stage and gradually slows down until it reaches a stable state. 2) Compared with the natural dry condition, the solution with a lower pH value causes the structural framework of the specimen to loosen, the mass loss degree to increase, and the porosity dispersion to intensify. 3) The dynamic water is more sensitive than the static water to the elastic vertical wave velocity of granite. Compared with the dry sample, the elastic longitudinal wave velocity of the sample in acidic solution with pH = 2 and flow rates of 0, 150, and 300 mm·s−1 for 49 days decreased by 8.7, 10.9, and 13.5%, respectively, which accelerates the instability and failure of the granite surroundings.

Item Type: Article
Subjects: Lib Research Guardians > Geological Science
Depositing User: Unnamed user with email support@lib.researchguardians.com
Date Deposited: 14 Mar 2023 12:27
Last Modified: 12 Aug 2024 07:08
URI: http://eprints.classicrepository.com/id/eprint/391

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