Abstract
To investigate the tensile behavior of rock bedding planes, a series of direct tensile tests were conducted on cylindrical limestone and sandstone specimens with a distinct bedding plane perpendicular to the axial direction. Different tensile strain rates of the bedding plane areas within the magnitude range from 10−6 to 10−2 s−1 were considered. The results indicate that the limestone fracture surfaces maintain the original roughness of bedding planes with few grain fractures. However, the sandstone fracture surfaces display many intergranular and transgranular fractures and are rough at the grain scale. The stress–strain curves of limestone specimens can be divided into elastic deformation stage and yield stage (the nonlinearity of yield stage is weaker with the increase of strain rate), while that of sandstone specimens develop in a nonlinear way accompanied by plastic deformation throughout the loading process. The strain rate significantly affects the tensile deformation and strength of the tested specimens (except the average deformation modulus of sandstone specimens). The elastic modulus, average deformation modulus, peak strain and tensile strength increase as strain rate goes up and have a linear relation with the logarithm of strain rate under the tested strain rate range (namely, under a relatively low strain rate range).
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Nos. 41807279, 41672300 and 41972297), the Natural Science Foundation of Hebei Province, China (No. E2019202336) and the Supporting program of hundred promising innovative talents in Hebei provincial education office (No. SLRC2019027).
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Cen, D., Huang, D., Song, Y. et al. Direct Tensile Behavior of Limestone and Sandstone with Bedding Planes at Different Strain Rates. Rock Mech Rock Eng 53, 2643–2651 (2020). https://doi.org/10.1007/s00603-020-02070-x
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DOI: https://doi.org/10.1007/s00603-020-02070-x