Abstract
To explore the size effect of dynamic tension on the mechanical properties of rocks, the Φ75mm SHTB and the Φ75mm SHPB test systems were used to test red sandstone samples with four different length–diameter ratios (l/d = 0.3, 0.5, 0.8, and 1.0). The size effect of fracture characteristics, tensile strength, and stress balance of rock samples under two loading methods were investigated, and two indexes that can characterize the size influence of rock’s fracture mechanism were defined: the relative length fracture ratio ηL and the relative area fracture ratio ηS. The results show that: (1) in the direct tensile test, with the increase in l/d ratio, the ηL of samples constantly increases, which shows that the fracture plane is farther away from the incident bar. And samples of all sizes have direct tensile strengths between 2.3 and 3.1 MPa, which drop as the l/d ratio rises. (2) In the indirect tensile test, the ηS of samples increases with the increase in l/d ratio, which shows that the area of the triangle-like crushing area at both ends of the sample decreases. And the plastic stage of the stress–strain curve of the specimen decreases continuously, and the impact indirect tensile strength increases continuously with the increase in l/d ratio. (3) Under two different loading methods, the uniformity of the internal stress of samples decreases as the l/d ratio rises and the samples at 1.0 l/d ratio can hardly meet the requirements of stress balance. (4) Size effect and non-uniformity effect are the main reasons for the difference between dynamic direct and indirect tensile strength, and non-uniformity effect plays a leading role.
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Acknowledgements
This work has been supported by The National Natural Science Foundation of China (No. 12272411), and the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (No. SKLGDUEK2207).
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YJ: conceptualization, Methodology, data curation, writing—original draft preparation. YZ: investigation, supervision. SL: conceptualization, investigation, data curation, funding acquisition, supervision. All authors reviewed the manuscript.
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Jia, Y., Zhai, Y. & Liu, S. Study on the size effect of rock under dynamic direct tension and indirect tension. Environ Earth Sci 83, 14 (2024). https://doi.org/10.1007/s12665-023-11326-y
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DOI: https://doi.org/10.1007/s12665-023-11326-y