Axial studies on cable bolts can be conducted using various scale testing apparatuses. Large scale testing, while providing a powerful platform for testing, is expensive and time consuming. This study presents details of a small scale pull out testing campaign on cable bolts and investigates the results achieved. Six popular types of cable bolts were studied using an anti rotation apparatus while encapsulated in cementitious grout and resin. The resin samples were tested under both monotonic and cyclic loading patterns. The results showed that grouted bulbed cables require higher displacement to reach their maximum load capacity which is lost at failure, while plain cables tend to hold lower loads for a longer time. Resin samples provided strain softening behaviour with low capacities, particularly in absence of cable indentation or bulbs. Cyclic loading tended to adversely affect the post peak behaviour of the resin samples, especially in the bulbed cables. Failed samples inspected after the testing suggested a non-uniform damage profile along the cable with extensive damage at the exit point transitioning into almost no damage at the entry point.

中文翻译：

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灌浆和树脂封装电缆螺栓的小规模实验室单调和循环拉拔测试


可以使用各种规模测试设备对电缆螺栓进行轴向研究。大规模测试虽然提供了强大的测试平台，但成本高昂且耗时。本研究详细介绍了对电缆螺栓进行的小规模拉拔测试活动，并调查了所获得的结果。使用防旋转装置研究了六种流行的电缆螺栓类型，同时封装在水泥基灌浆和树脂中。树脂样品在单调和循环加载模式下进行了测试。结果表明，灌浆球形电缆需要更高的位移才能达到其最大负载能力，而普通电缆往往在较长时间内保持较低的负载。树脂样品具有低容量的应变软化行为，尤其是在没有电缆压痕或球的情况下。循环加载往往会对树脂样品的峰后行为产生不利影响，尤其是在球形电缆中。测试后检查的不合格样品表明，电缆沿线的损坏分布不均匀，出口点处有大面积损坏，在入口处过渡到几乎没有损坏。