摘要：A series of laboratory tests were performed to study the mechanical behaviours of newly developed highstrength rock bolt components, including rebar, thread, plate, and domed washer. The characteristics ofdeformation and damage of each component were presented. The stress distribution of plate and domedwasher was investigated through finite element modelling. The numerical results show that the yieldand tensile strengths of the developed high strength rebar are 33.6%e58.3% and 17.2%e28.7% greaterthan those of the conventional rebar, respectively. The increase in yield strength was higher than that intensile strength, suggesting an increase in yield to tensile strength ratio and a decrease in elongation. It iswell-known that the thread processing may not be of high precision and accuracy as expected, which ischaracterised as rough thread surface, non-identical tooth height, toe stripping, and cracks in the surface.Hardening during thread processing tends to increase the thread yield and tensile strengths. In thispaper, the typical deformation process of arch-shaped plate is classified into five stages. The tested platesexhibited distinct deformation characteristics and bearing capacities due to variations in shape, size,material and presence of washer. It was observed that uneven bottom surface, low bearing arch and largeradius of the transitional arc connecting bearing arch and bottom surface were the major reasons accountingfor low load-bearing capacity of plates. The performance of domed washer has a close relationwith the shape, size, strength, and deformation compatibility with plate. Stress concentration wasobserved on the periphery of the contact surface between domed washer and plate, which is significantlyinfluenced by the strength of domed washer and is considered to be 20%e30% higher than that of plate.Finally, a case study in the Datong coal mining district was presented, and the support pattern and effectof the developed rock bolt were described. 2015 Institute of Rock and Soil Mechanics, Chinese Acad

关键词：mining engineering rock boltrebar thread 

单位：Coal Mining and Designing Branch China Coal Research Institute Beijing 100013 China State Key Laboratory of Coal Mining and Clean Utilization China Coal Research Institute Beijing 100013 China