Dynamic behavior of NPR bolt and its application to rock burst control

This paper presents an innovative bolt which has the Negative Poisson's Ratio effect (NPR bolt). The NPR bolt can absorb energy and sustain high constant resistance and large deformation. The working principle of this new type of bolt is introduced and a series of dynamic laboratory tests have been conducted to verify its large deformation resistance and high dynamic bearing capacity. The results of the dynamic tests show that the NPR bolt can withstand repeated impact, and maintain the stability of the constant value under impact load. Finally, the NPR bolt is applied for rock burst control.