An analytical model for axial performance of rock bolts under constant confining pressure based on continuously yielding criterion. (July 2021)

• Record Type: Journal Article
• Authors: Li, Danqi; Li, Yingchun; Chen, Jianhang; Masoumi, Hossein
• Is Part Of: Tunnelling and underground space technology. Volume 113(2021)
• Publication Date: 2021-07
• Subjects: Rock bolts -- Analytical model -- Load-displacement performance; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2021.103955
• Languages: English
• ISSNs: 0886-7798

Abstract

Highlights: Two novel governing equations were proposed and validated to capture the peak load and residual load envelopes for rockbolts. Continuously yielding model was modified for development of the analytical model. The analytical framework was proposed and validated for simulation of rockbolts behaviour under axial loading. Abstract: An analytical model is developed to simulate the load-displacement performance of rock bolts under axial loading based on Modified Continuously Yielding Criterion. Such a model accounts for various surface geometries of rock bolt as well as the various confining pressures at the rock bolt to the grout interface which play significant roles in the behaviour of grouted rock bolts under axial loading. Majority of the defined parameters in the model can be measured within the laboratory environment. The proposed model is validated against the experimental results obtained from FRP and HA25 rock bolts. The good agreement between the experimental results and the analytical predictions highlights the ability of the proposed model to simulate the full load-displacement behaviour of rock bolts under axial loading.