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| Experimental study on the dynamic tensile properties of red-sandstone after cyclic wetting and drying#br# |
| DU Bin1，2，3，BAI Haibo1，MA Zhanguo1，LI Ming1，WU Guangming1 |
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 211116，China；2. Institute of Architectural Engineering Technology，Jiangsu Vocational Institute of
Architectural Technology，Xuzhou，Jiangsu 221116，China；3. Jiangsu Collaborative Innovation Center for Building
Energy Saving and Construction Technology，Xuzhou，Jiangsu 221116，China) |
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Abstract In order to investigate the influence of cyclic wetting and drying on the dynamic tensile strength of rock，a series dynamic Brazilian disc tests on red-sandstone were carried out through split Hopkinson pressure bar (SHPB) apparatus with a diameter of 50 mm. The laboratory test results indicate that cyclic wetting and drying have a strong deterioration effect on the static and dynamic tensile strength and that the static and dynamic tensile strength both decrease with the increasing of the number of cycles. Under the different conditions of loading rate，all specimens(the times of wet-dry cycles as the variable) have a critical loading rate . When the loading rate is below ，the dynamic tensile strength increases with the increasing of loading rate. While the dynamic tensile strength remains unchanged when the loading rate is above . When the loading rates are the same，the dynamic tensile strengths decrease with the increasing of the number of wet-dry cycles，and the decreasing rate appears quickly initially and slowly later. There is an obvious fractal feature of red-sandstone fragment after different wet-dry cycles，ranging from 2.46 to 2.81 of the fractal dimension，The relationship between the fractal dimension and loading rate is logarithmic. An empirical equation considering the combined effect of the wet-dry cycles and loading rate is established to calculate the dynamic tensile strength of red-sandstone.
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