Abstract
In this paper, a series of experiments were conducted on typical volcanic breccia collected from the foundation of Baihetan Dam. Considering previous work, the mechanical behavior and permeability of the volcanic breccia were further investigated. The experimental results showed that the compressive strength and Young’s modulus of the volcanic breccia decrease due to the presence of water. However, the Poisson’s ratio of the wet specimens was higher than that of the dried specimens. The permeability evolution under triaxial compression was divided into 5 stages. The fluid pressure showed a great influence on the permeability of the volcanic breccia. The water weakening mechanism and the effect of fluid pressure on the permeability were discussed. The effect of water on the strength of volcanic breccia is influenced by both subcritical crack growth and calcite dissolution. Due to the pore pressure gradient and the water weakening effect, the change in permeability with volumetric strain varies greatly.
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Funding
This work was supported by National Key R&D Program of China (2018YFC0407006), open fund of state key laboratory of hydraulics and mountain river engineering (Sichuan University) (No. SKHL1725), China Postdoctoral Science Foundation Funded Project (Grant No. 2017M620838), and the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research), Grant No:IWHR-SKL-KF202016.
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Jia, C., Xu, W., Wang, H. et al. Experimental investigation of the mechanical and permeability characteristics of volcanic breccia. Bull Eng Geol Environ 80, 599–610 (2021). https://doi.org/10.1007/s10064-020-01949-x
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DOI: https://doi.org/10.1007/s10064-020-01949-x