Abstract In this study, the basalt rock extracted from the Kalgoorlie region of Western Australia is intensively studied on its compressive properties under both static and dynamic loads covering strain rate between 2.22 × 10-6/s to 408/s. The ultimate compressive strength and corresponding failure strain are quantified. The test results show that Kalgoorlie basalt rock exhibits high sensitivity to strain rate effect on its compressive strength especially above 100/s and dynamic increment factor up to 2.3 at strain rate 403/s. The failure strain also shows dependency to high strain rate. Discussion is made on fragment analysis which found the natural heterogeneous and anisotropic of WA basalt rocks cause variations on its compressive strength and dependent on the failure angle of the joints (layer formation). The dynamic increase mechanism on material compressive properties is observed to be correlated to the failure crack path formation, which can be explained through the fracture process captured from high-speed camera images analysis. Comparisons are also made on rock strengths with others’ test data. A novel method based on numerical modelling is introduced which removes the influence of lateral inertia effect and specimen end friction effect out of the laboratory testing results. The true dynamic increase factor (DIF) for Kalgoorlie basalt rock at different strain rates are derived for more accurate analysis and design.

中文翻译：

---

卡尔古利玄武岩的动力压缩特性

摘要 在这项研究中，对从西澳大利亚卡尔古利地区提取的玄武岩进行了深入研究，研究了其在静载荷和动载荷下的压缩特性，包括应变率在 2.22 × 10-6/s 到 408/s 之间。对极限抗压强度和相应的破坏应变进行量化。试验结果表明，卡尔古利玄武岩对其抗压强度的应变率效应表现出较高的敏感性，尤其是在100/s以上，在应变率403/s时动态增量因子高达2.3。破坏应变也显示出对高应变率的依赖性。对碎片分析进行了讨论，发现西澳玄武岩的天然非均质性和各向异性会导致其抗压强度发生变化，并取决于节理的破坏角度（层状结构）。观察到材料压缩性能的动态增加机制与破坏裂纹路径的形成有关，这可以通过高速相机图像分析捕获的断裂过程来解释。还对岩石强度与其他人的测试数据进行了比较。介绍了一种基于数值建模的新方法，消除了实验室测试结果中的横向惯性效应和试样端部摩擦效应的影响。推导出不同应变率下卡尔古利玄武岩的真实动态增加系数 (DIF)，以便进行更准确的分析和设计。还对岩石强度与其他人的测试数据进行了比较。介绍了一种基于数值建模的新方法，消除了实验室测试结果中的横向惯性效应和试样端部摩擦效应的影响。推导出不同应变率下卡尔古利玄武岩的真实动态增加系数 (DIF)，以便进行更准确的分析和设计。还对岩石强度与其他人的测试数据进行了比较。介绍了一种基于数值建模的新方法，消除了实验室测试结果中的横向惯性效应和试样端部摩擦效应的影响。推导出不同应变率下卡尔古利玄武岩的真实动态增加系数 (DIF)，以便进行更准确的分析和设计。