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| Rock tensile testing and problem analysis based on a universal #br#
direct tensile approach |
| LIU Jianfeng1，LIANG Chao1，WANG Lu1，2，PEI Jianliang1，DAI Jingjing1，LU Gongda1，ZHOU Lulin1，LIN Hao1 |
| (1. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；2. School of Architecture and Civil Engineering，Xihua University，Chengdu，Sichuan 610039，China) |
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Abstract In view of the limitations and difficulties of the existing direct tensile method for testing rock tensile strength，such as high requirements for equipment，complex test process and low success rate of tests，the existing direct tensile method cannot be widely used in rock tensile strength testing. Therefore，based on the concept of “compression to tension”，an universal direct tensile method is proposed which can be performed by the ordinary testing equipment. In order to clarify the feasibility of the direct tensile method proposed in this paper，the Brazilian splitting method，which is recommended internationally，was used as the compared method，and three kinds of rocks such as marble，sandstone and granite were taken as the representatives of metamorphic rock，sedimentary rock and magmatic rock for testing and discussing. The results show that the method is simple and easy to use，and that the test results have good consistency. The direct tensile strength of the three types of rocks is lower than that of the indirect tensile strength，which is consistent with the existing research results. Furthermore，considering the factors potentially affecting the test results，the key factors that should be considered in the further optimization of the method in the future were proposed，such as seam width，seam bottom radian，the column height and bottom thickness，and the ratio of cylinder wall thickness to particle size.
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2023, Vol. 42 
