Analysis of load transfer mechanism for fully grouted rockbolts based on the bi-exponential shear-slip model
ZHOU Shichang1，2，ZHU Wancheng1，2，YU Shuisheng1，2
(1. College of Resources and Civil Engineering，Northeastern University，Shenyang，Liaoning 110819，China；2. Center for Rock Instability and Seismicity Research，Northeastern University，Shenyang，Liaoning 110819，China)
A numerical model waspresented in this study to analyze the load-transfer mechanism of fully grouted rockbolts，which was based on the bi-exponential shear-slip model of the anchorage interface and the linear enhanced elasto-plastic constitutive model of the rockbolt. It was validated bypull-out tests. The load-transfer characteristics with different anchorage lengths were studied in detail. The distribution of axial stress and shear stress along the rockboltwith anchorage length of 1.5m was examined. The numerical results showed that it couldnot only describe the failure modes of interface slippage and tensile failure of rockbolts，but also determine whether the rockbolt yields during the full-range process of pullout. The reliability and accuracy of the proposed analytical model were verified by experimental pullout tests.
周世昌1，2，朱万成1，2，于水生1，2. 基于双指数剪切滑移模型的全长锚固锚杆荷载传递机制分析[J]. 岩石力学与工程学报, 2018, 37(S2): 3817-3825.
ZHOU Shichang1，2，ZHU Wancheng1，2，YU Shuisheng1，2. Analysis of load transfer mechanism for fully grouted rockbolts based on the bi-exponential shear-slip model. , 2018, 37(S2): 3817-3825.
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2018, Vol. 37 
