There is limited applicability to the current method for testing the direct tensile strength of rocks because it places stringent requirements on the testing equipment. This work suggests a universal method based on the “compression-to-tension” idea in response to these difficulties. By applying pressure, this technique makes it possible to test the tensile strength of rocks directly with any conventional compression test machines. Granite was utilized as the test material in order to validate this suggested testing method, and the results showed what follows. Upon determining the true fracture area through digital reconstruction, an average calculated tensile strength of 5.97 MPa with a Cv of 0.04 was obtained. There is a positive correlation between tensile strength and the joint roughness coefficient (JRC) of the failure surface. The aggregation mode of AE events with the loading process conforms to the damage characteristics of rock tensile failure. The direct tensile testing method proposed in this study not only has high universality but also produces test results with outstanding consistency. Additionally, factors influencing the results of the tensile test are pointed out, and recommendations for optimizing the suggested testing method are offered.

中文翻译：

---

一种用于测量岩石抗拉强度的通用直接拉伸试验方法


由于对测试设备提出了严格的要求，因此当前测试岩石直接抗拉强度的方法适用性有限。这项工作提出了一种基于 “compression-to-tension” 思想的通用方法来应对这些困难。通过施加压力，该技术可以直接使用任何传统的压缩试验机测试岩石的抗拉强度。花岗岩被用作测试材料，以验证这种建议的测试方法，结果显示以下内容。通过数字重建确定真实断裂面积后，平均计算的抗拉强度为 5.97 MPa，Cv 为 0.04。抗拉强度与破坏表面的接头粗糙度系数 （JRC） 之间存在正相关关系。声发射事件随加载过程的聚集模式符合岩石拉伸破坏的损伤特性。本研究提出的直接拉伸试验方法不仅具有较高的通用性，而且产生的测试结果具有突出的一致性。此外，还指出了影响拉伸试验结果的因素，并提供了优化建议测试方法的建议。