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Investigating the mechanical behavior and failure mechanisms of rock bolts subjected to multiple impact loads using a newly developed experimental test apparatus
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-17 , DOI: 10.1016/j.tust.2025.106388
Guiyang Yuan, Fuqiang Gao, Jinfu Lou, Jinghe Yang, Shuangyong Dong, Linpo Si
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-17 , DOI: 10.1016/j.tust.2025.106388
Guiyang Yuan, Fuqiang Gao, Jinfu Lou, Jinghe Yang, Shuangyong Dong, Linpo Si
Understanding the behavior and failure mechanisms of rock bolts subjected to multiple impact loads is essential for improving the safety and performance of underground support systems. In this study, a series of experimental tests were performed to investigate the deformation, energy absorption, and failure mechanisms of pre-tensioned rock bolts under multiple impacts. The result indicates that with an increasing number of impacts, the rebound amount of rock bolts gradually increases, while the plastic deformation decreases. The energy absorbing ratio of the rock bolt decreases as the energy releasing ratio increases, leading to a decline in the rock bolt’s ability to absorb energy and an increase in brittleness. It was observed that the accumulation of plastic deformation consumes the yielding and strengthening stages of the rock bolt, making it prone to fracture at smaller deformations in later stages. It was also found that the final elongation of a rock bolt subjected to multiple impacts leading to fracture is significantly higher compared to a rock bolt subjected to a pure pull-out test. These insights have important implications for the design of rock bolt support systems in underground excavations.
中文翻译:
使用新开发的实验测试设备研究岩石锚杆承受多种冲击载荷的机械行为和失效机制
了解岩石锚杆在多重冲击载荷下的行为和失效机制,对于提高地下支护系统的安全性和性能至关重要。在本研究中,进行了一系列实验测试,研究了预张拉岩石锚杆在多次冲击下的变形、能量吸收和破坏机制。结果表明,随着冲击次数的增加,岩石锚杆的回弹量逐渐增加,而塑性变形减小。岩石锚杆的吸能率随着能量释放率的增加而降低,导致岩石锚杆的吸能能力下降,脆性增加。据观察,塑性变形的积累消耗了岩石锚杆的屈服和加固阶段,使其在后期容易在较小的变形中断裂。研究还发现,与进行纯拉拔试验的岩石锚杆相比,岩石锚杆在多次冲击下导致断裂的最终伸长率明显更高。这些见解对地下挖掘中岩石锚杆支护系统的设计具有重要意义。
更新日期:2025-01-17
中文翻译:
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使用新开发的实验测试设备研究岩石锚杆承受多种冲击载荷的机械行为和失效机制
了解岩石锚杆在多重冲击载荷下的行为和失效机制,对于提高地下支护系统的安全性和性能至关重要。在本研究中,进行了一系列实验测试,研究了预张拉岩石锚杆在多次冲击下的变形、能量吸收和破坏机制。结果表明,随着冲击次数的增加,岩石锚杆的回弹量逐渐增加,而塑性变形减小。岩石锚杆的吸能率随着能量释放率的增加而降低,导致岩石锚杆的吸能能力下降,脆性增加。据观察,塑性变形的积累消耗了岩石锚杆的屈服和加固阶段,使其在后期容易在较小的变形中断裂。研究还发现,与进行纯拉拔试验的岩石锚杆相比,岩石锚杆在多次冲击下导致断裂的最终伸长率明显更高。这些见解对地下挖掘中岩石锚杆支护系统的设计具有重要意义。