对灌浆和树脂包裹电缆螺栓进行小规模实验室单调和循环拉拔测试

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-09-16 DOI:10.1016/j.ijrmms.2024.105914
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引用次数: 0

摘要

电缆螺栓的轴向研究可通过各种规模的测试设备进行。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。本研究介绍了电缆螺栓小规模拉拔测试活动的详情,并对取得的结果进行了调查。使用防旋转仪器对六种常用的电缆螺栓进行了研究,同时将其封装在水泥基灌浆料和树脂中。树脂样品在单调和循环加载模式下进行了测试。结果表明,灌浆球形缆索需要较大的位移才能达到最大承载能力,并在失效时失去最大承载能力,而普通缆索往往能在较长时间内保持较低的承载能力。树脂样品具有应变软化行为,但承载能力较低,尤其是在没有电缆压痕或鼓包的情况下。循环加载往往会对树脂样品的峰值后行为产生不利影响,尤其是在有凸起的电缆中。测试后检查的失效样品表明,电缆沿线的损坏情况并不均匀,出口处有大量损坏,而入口处几乎没有损坏。
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Small scale laboratory monotonic and cyclic pull out testing on grout and resin encapsulated cable bolts

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.

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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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