Energy absorption mechanism and design method of anchor cable under dynamic-static coupling condition

Abstract

To effectively control the large deformation of the surrounding rock under complex conditions, it is often necessary to apply prestress to anchor cables. However, due to the influence of surrounding rock deformation, mining disturbance, and strong impact, anchor cables are often in a dynamic and static coupling stress state. Therefore, it is crucial to study the dynamic and static coupling mechanical characteristics of anchor cables. Based on this, the self-developed dynamic and static coupling test equipment is developed. The dynamic and static coupling mechanical test of anchor cables is conducted. Test results indicate that the energy absorption for anchor cables under the initial load of 350 kN decreased by 69.8% compared to the condition without initial load, and the energy absorption efficiency increased by 6.6 times. The increase of initial load can improve its energy absorption efficiency, but it can also lead to a decrease in its energy absorption. The energy absorption and energy absorption efficiency shows a bilinear variation law with the increase of initial load. On this basis, the energy absorption calculation formula and the support design model of the anchor cable are established. It provides new ideas for the safety control of dynamic disasters in deep engineering.

Keywords

Anchor cable support / Working load / Dynamic and static coupling test / Energy absorption characteristics / Design method

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