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首页> 外文期刊>Canadian Geotechnical Journal >Experimental and numerical study on determination of indirect (splitting) tensile strength of rocks under various load apparatus
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Experimental and numerical study on determination of indirect (splitting) tensile strength of rocks under various load apparatus

机译：不同载荷下岩石间接（劈裂）抗拉强度测定的试验与数值研究

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The indirect tensile strengths (ITSs) of more than 200 disc specimens for 19 different rock and rock-like materials were determined by considering the concept of fracture toughness under different loading conditions. Steel loading arcs with various contact angles and flat platens were used in experiments to investigate whether they can be used as alternatives for the standard Brazilian jaw. Many of the disc specimens tested under the standard jaw did not fail with ideal tensile cracking at the centre, whereas simple splitting cracks were obtained along the vertical diameter of most of the discs tested under the flat platens. However, flat platens caused cracks to initiate in the compressive zone just under the loading points. This is an important outcome for criticizing the validity of the test because tensile failure is expected to occur along the vertical diameter of the disc. Friction conditions between the disc and jaw have important roles in the failing load. Moreover, fracture toughness is an additional parameter for investigating the ITSs of rock materials. According to the experimental results, fracture toughness values were found to increase with an increase in contact angle. In addition to the experimental study, finite element analyses were performed on several types of rock discs under various loading conditions. As a result, a comparison between all loading conditions was made to determine the best ITSs of the rocks. Both experimental and numerical analyses concluded that deciding the best loading type depends on the rock type. Therefore, the standard jaw is not recommended to use for determination of the ITS values of all rock types.
机译：考虑到不同载荷条件下的断裂韧性概念，确定了200种圆盘试样对19种不同岩石和类岩石材料的间接拉伸强度（ITS）。在实验中使用了具有不同接触角的钢制加载弧和平板，以研究它们是否可以用作标准巴西钳口的替代品。在标准钳口下测试的许多圆盘试样在中心处均未出现理想的拉伸裂纹而失败，而沿大多数在平板压盘下测试的圆盘的垂直直径获得了简单的裂痕。但是，平板在加载点正下方的压缩区域会引起裂纹。这是批评测试有效性的重要结果，因为预计拉伸破坏会沿着圆盘的垂直直径发生。圆盘和钳口之间的摩擦条件在载荷失败时起重要作用。此外，断裂韧性是研究岩石材料ITS的附加参数。根据实验结果，发现断裂韧性值随着接触角的增加而增加。除实验研究外，还对几种岩石圆盘在各种载荷条件下进行了有限元分析。结果，在所有加载条件之间进行了比较，以确定最佳的ITS。实验和数值分析均得出结论，确定最佳加载类型取决于岩石类型。因此，不建议将标准钳口用于确定所有岩石类型的ITS值。

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