Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

International Journal of Coal Science & Technology

Research

Qiru Sui¹  Shulin Ren¹  Zhigang Tao¹  Manchao He¹  Mengnan Li¹ 

[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, 100083, Beijing, China;School of Mechanics and Civil Engineering, China University of Mining and Technology, 100083, Beijing, China;

关键词: Anchorage joints;    2G-NPR bolt;    Tensile–shear fracture criterion;    Shear behavior;    Numerical simulation;   

DOI  :  10.1007/s40789-023-00617-1

 received in 2023-05-10, accepted in 2023-08-03,  发布年份 2023

来源: Springer

【 摘 要 】

2G-NPR bolt (the 2nd generation Negative Poisson’s Ratio bolt) is a new type of bolt with high strength, high toughness and no yield platform. It has significant effects on improving the shear strength of jointed rock mass and controlling the stability of surrounding rock. To achieve an accurate simulation of bolted joint shear tests, we have studied a numerical simulation method that takes into account the 2G-NPR bolt's tensile–shear fracture criterion. Firstly, the indoor experimental study on the tensile–shear mechanical properties of 2G-NPR bolt is carried out to explore its mechanical properties under different tensile–shear angles, and the fracture criterion of 2G-NPR bolt considering the tensile–shear angle is established. Then, a three-dimensional numerical simulation method considering the tensile–shear mechanical constitutive and fracture criterion of 2G-NPR bolt, the elastoplastic mechanical behavior of surrounding rock and the damage and deterioration of grouting body is proposed. The feasibility and accuracy of the method are verified by comparing with the indoor shear test results of 2G-NPR bolt anchorage joints. Finally, based on the numerical simulation results, the deformation and stress of the bolt, the distribution of the plastic zone of the rock mass, the stress distribution and the damage of the grouting body are analyzed in detail. The research results can provide a good reference value for the practical engineering application and shear mechanical performance analysis of 2G-NPR bolt.

【 授权许可】

CC BY   
© China Coal Research Institute 2023

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