Abstract
To study the influence of wetting‐drying cycles on dynamic mechanical properties of rock masses, the impact compression tests of red sandstone samples were carried out by using a split Hopkinson pressure bar (SHPB) apparatus with a diameter of 50 mm. The results showed that under the same number of wetting‐drying cycles, the dynamic compressive strength of red sandstone increased exponentially with the strain rate, and the sensitivity of the strain rate decreased with the increase of wetting‐drying cycles. The deterioration effect of wetting‐drying cycles was significant, and the dynamic and static compressive strength decreased with the increase of wetting‐drying cycles; the higher the strain rate, the stronger the sensitivity to wetting‐drying cycles. Besides, the influence of wetting‐drying cycles and strain rate was comprehensively studied, and the equation of dynamic compressive strength of red sandstone was obtained. After different wetting‐drying cycles, the fractal characteristics of red sandstone dynamic fragmentation were obvious, and the fractal dimension was 2.02–2.80, and the fractal dimension increased logarithmically with the strain rate. Finally, the internal microstructure of red sandstone after different wetting‐drying cycles was analyzed, and the degradation mechanism of the rock by the cycles was discussed.
Highlights
From the abovementioned research results, it can be seen that the wetting-drying cycles have a certain degradation effect on the static and dynamic mechanical properties of red sandstone, and with the increase of wetting-drying cycles, the deterioration of red sandstone is a progressive process of damage accumulation
Based on the static and dynamic mechanical tests of red sandstone, the dynamic compression mechanical properties of rock under the action of wetting-drying cycles are systematically studied in this paper. e relationship among the dynamic compressive strength of red sandstone, strain rate, and the number of wetting-drying cycles are analyzed. e conclusions are obtained as follows: (1) With the increase of strain rate, the dynamic compressive strength of red sandstone increases gradually, and it is significantly affected by the strain rate. e sensitivity of the strain rate of dynamic compressive strength of red sandstone decreases with the increase of wetting-drying cycles, and the effect of strain rate of rock samples without wetting-drying cycles is the most significant
At the same strain rate, the fractal dimension increases with the increasing number of wetting-drying cycles
Summary
Experimental Study on Dynamic Compression Characteristics of Red Sandstone under Wetting-Drying Cycles. To study the influence of wetting-drying cycles on dynamic mechanical properties of rock masses, the impact compression tests of red sandstone samples were carried out by using a split Hopkinson pressure bar (SHPB) apparatus with a diameter of 50 mm. The influence of wetting-drying cycles and strain rate was comprehensively studied, and the equation of dynamic compressive strength of red sandstone was obtained. Zhou et al [23, 24] conducted dynamic compression and dynamic tensile tests on sandstone rock samples with different wetting-drying cycles and found that the dynamic mechanical properties of sandstone have deteriorated to different degrees. E dynamic compression properties and fragmentation evolution law of red sandstone under the combined action of wetting-drying cycles and the strain rate were analyzed. To minimize the influence of temperature on rock mechanical properties, Density (kg·m−3) 2485
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