Development of multi-functional anchorage support dynamic-static coupling performance test system and its application

Abstract

In underground engineering with complex conditions, the bolt (cable) anchorage support system is in an environment where static and dynamic stresses coexist, under the action of geological conditions such as high stresses and strong disturbances and construction conditions such as the application of high prestress. It is essential to study the support components performance under dynamic-static coupling conditions. Based on this, a multi-functional anchorage support dynamic-static coupling performance test system (MAC system) is developed, which can achieve 7 types of testing functions, including single component performance, anchored net performance, anchored rock performance and so on. The bolt and cable mechanical tests are conducted by MAC system under different prestress levels. The results showed that compared to the non-prestress condition, the impact resistance performance of prestressed bolts (cables) is significantly reduced. In the prestress range of 50–160 kN, the maximum reduction rate of impact energy resisted by different types of bolts is 53.9%–61.5% compared to non-prestress condition. In the prestress range of 150–300 kN, the impact energy resisted by high-strength cable is reduced by 76.8%–84.6% compared to non-prestress condition. The MAC system achieves dynamic-static coupling performance test, which provide an effective means for the design of anchorage support system.

Keywords

• Anchorage support system
• Development of test system
• Dynamic-static coupling test
• Combined stress