Dynamic mechanical characteristics and application of constant resistance energy-absorbing supporting material

Abstract

In deep underground engineering, rock burst and other dynamic disasters are prone to occur due to stress concentration and energy accumulation in surrounding rock. The control of dynamic disasters requires bolts and cables with high strength, high elongation, and high energy-absorbing capacity. Therefore, a constant resistance energy-absorbing (CREA) material is developed. In this study, the dynamic characteristics of the new material are obtained via the drop hammer tests and the Split Hopkinson Pressure Bar (SHPB) tests of the new material and two common bolt (CB) materials widely used in the field. The test results of drop hammer test and SHPB test show that the percentage elongation of CREA material is more than 2.64 and 3.22 times those of the CB material, and the total impact energy acting on CREA material is more than 18.50 and 21.84 times, respectively, indicating that the new material has high elongation and high energy-absorbing capacity. Subsequently, the CREA bolts and cables using the new material are developed, which are applied in roadways with high stress and strong dynamic disturbance. The field monitoring results show that CREA bolts and cables can effectively control the surrounding rock deformation and ensure engineering safety.