Vol16 No.5: 1160-1169
【Title】Supporting characteristics analysis of constant resistance bolts under coupled static-dynamic loading
【Author】CHEN Feng1,2; TANG Chun-an1; SUN Xiao-ming2; MA Tian-hui1,2*; DU Yan-hong3
【Addresses】1 School of Civil Engineering, Dalian University of Technology, Dalian 116024, China; 2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China; 3 School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
【Corresponding author】MA Tian-hui
【Citation】Chen F, Tang CA, Sun XM, et al. (2019) Supporting characteristics analysis of constant resistance bolts under coupled static-dynamic loading. Journal of Mountain Science 16(5). https://doi.org/10.1007/s11629-018-5044-9
【Abstract】To study the tensile mechanical properties of constant resistance bolts, the RFPA (Rock Failure Process Analysis) statics software is used to perform a uniaxial tensile test on a constant resistance bolt. The numerical test results show that the plastic strain value is 12 times the magnitude of the elastic strain. During plastic deformation, the fluctuation in the stress magnitude is relatively stable, indicating that the bolt has good constant resistance characteristics. The numerical test results are in good agreement with the laboratory test results of M.C. He, and the accuracy and reliability of the numerical test method are verified. Therefore, the RFPA software with coupled static-dynamic loading is further adopted to study the supporting effects of traditional bolts and constant resistance bolts under coupled static-dynamic loading. The numerical comparison of the test results show that the constant resistance bolts can effectively control the deformation amount and rate of the laneway surrounding rock, reduce the total and rate of increase in the accumulated acoustic emissions, decrease the stress on the units in the model and protect the stability of the laneway. This paper verifies that a constant resistance bolt has better impact resistance mechanical properties than those of a traditional bolt and provides an effective way to control rock burst and soft rock that is prone to large deformation damage.
【Keywords】Rock mechanics; Coupled static-dynamic loading; Deep laneway; Constant resistance bolt; RFPA