Energy evolution and failure characteristics of sandstone under high temperature and acidic solutions

Abstract

Sandstone is commonly found in mountainous regions of China, and the mountain tunnels are often built in sandstone strata. The tunnel surrounding rocks often suffer from elevated temperature and acidic solutions during tunnel construction and operation. In this study, the energy evolution and failure characteristics of sandstones under elevated temperature and acidic solutions were investigated by observing the compressive strength, elastic deformation energy density, dissipative energy density, failure mode, and fracture distribution characteristics of sandstone through uniaxial compression tests and computed tomography scanning. The findings indicate that elevated temperature and acidic solutions had a significant impact on the energy distribution and failure mode of sandstone, and their effects on the failure mode and fracture distribution characteristics of sandstone varied at different stages. The influence of elevated temperature on the energy distribution and failure mode of sandstone was more pronounced compared to that of the acidic solution. Furthermore, the elastic deformation energy density and dissipative energy density of sandstone showed a close linear relationship with failure characteristics. These conclusions could provide a theoretical significance for the design and construction of rock structures under complex high-temperature conditions, and associated tunnel projects.

Keywords

high temperature / acidic solution / sandstone / energy characteristics / failure mode

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