Mechanical Response and Failure Mechanisms of Cable-Bolt Reinforcement Under Impact Loading

With mining depth increasing, rock burst disasters are likely to occur and induce impact loading on the cable-bolt reinforcement. Based on this fact, this paper conducted a literature review on the mechanical response and failure mechanisms of cable-bolt reinforcement under impact loading. Two different experimental testing methods were summarised, including the horizontal high-speed impact-loading test and vertical drop-hammer impact-loading test. The advantages and disadvantages of these two experimental test methods were summarised. Compared with the horizontal high-speed impact-loading test, when the vertical drop-hammer impact-loading test was used, the impact energy can be adjusted conveniently. Additionally, the maximum impact velocity can be increased to several times. The influence of different parameters on the mechanical response of the cable-bolt reinforcement was reviewed, including the cable-bolt structure, impact energy and pretension force. Considering that the impact energy may be applied on the cable-bolt reinforcement along the transverse direction, the shear load-bearing behaviour of the cable-bolt reinforcement was also reviewed. Following this, when the impact loading occurred, the cable-bolt reinforcement failure modes were summarised, including the cable-bolt rupture, cable-bolt slippage and locking-nut slippage. This research is beneficial for researchers to better understand the mechanical response and failure mechanisms of the cable-bolt reinforcement subjected to impact loading.