Uniaxial compression mechanical properties and deterioration mechanism of sandstone under different humidity conditions

Abstract

In order to explore the mechanical properties of surrounding rock mass in high-humidity environment of mine, based on the self-made humidity environment control simulation device, the mechanical characteristics and deterioration mechanism of sandstone samples at different relative humidity conditions (70%, 80%, 90% and 100%) under uniaxial compression were studied. The results show that: 1) With the increase in relative humidity, the porosity of sandstone increases gradually, while the mass and strength decrease obviously, but the corrosion ability of humidity to specimens decreases after reaching a certain time; 2) The acoustic emission variation of sandstone under uniaxial compression is consistent with the stress evolution characteristics, and the number of acoustic emission events in the high humidity environment is significantly lower than that under the dry condition; 3) As the relative humidity of the environment increases, the fractal dimension of sandstone fragmentation gradually increases, the fractal position parameters and fragment scale parameters gradually decrease, and the fragment size and distribution concentration gradually decrease after sandstone failure; 4) The peak diffraction intensity and mineral content of sandstone albite and calcite decrease with the increase of relative humidity, while the size and number of microcracks increase with the increase of relative humidity. The damage and deterioration mechanism of sandstone under high-humidity environment includes the combined effect of physical and chemical erosion. The research results will provide necessary references for the stability control of surrounding rock in high humidity environment of mine.

Keywords

high humidity environment / sandstone / fractal dimension / deterioration mechanism / uniaxial compression

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