Roadway hydraulic support for rockburst prevention in coal mine and its application

In view of the problem that the existing roadway support is difficult to resist the strong earthquake and strong impact of roadway and thus causes support failure,roadway collapse and casualties,the static and dynamic analysis of roadway surrounding rock-support system is carried out,and the six principles of rock burst prevention support design are put forward,namely,the design with variable abdicating resistance,the design with variable abdicating displace- ment,the design with variable abdicating stiffness,the design with variable abdicating frequency,the design with varia- ble abdicating velocity and the design with variable abdicating energy. The roadway hydraulic support for rock burst prevention with energy absorption function is developed. In addition,the buckling and energy absorption characteristics of inducement and prefolded component in rock burst prevention device of support are studied through laboratory ex- periments. The results show that the single section rock burst prevention component ’ s abdicating resistance is 1 820 kN,abdicating displacement is 100 mm,abdicating stiffness and abdicating frequency are 0,abdicating velocity is 2. 3 m / s and abdicating energy absorption is 182 kJ. The two-section rock burst prevention component’s abdicating resistance is 2 010 kN,abdicating displacement is 200 mm,abdicating stiffness and abdicating frequency are 0,abdi- cating velocity is 2. 2 m / s and abdicating energy absorption is 402 kJ. The experimental results of two components meet the technical parameters requirements of rock burst prevention hydraulic support. Furthermore,the support state, energy absorption and rock burst prevention effect of rock burst prevention hydraulic support in the underground of Gengcun coal mine are monitored and analyzed. It is found that the maximum abdicating displacement of rock burst prevention hydraulic support is 16 cm in the process of ML3. 0 strong earthquake,which plays the expected role of en- ergy absorption and rock burst prevention,and indirectly proves the rationality of rock burst prevention support design principles.