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基于量化GSI围岩评级系统及Hoek-Brown应变软化模型,应用FLAC3D数值模拟软件,分析全长粘结锚杆在不同长度及不同本构模型条件下的受力特点,对比分析不同预应力对锚杆轴力及剪力的影响。结果表明:采用理想弹塑性模型与应变软化模型计算得到的锚杆轴力及剪力相差较大;通过现场实际应用可知,应变软化模型能够较为真实地反应围岩的屈服破坏过程,在支护结构设计中,建议采用应变软化模型进行计算,可得到较为精确的计算结果。
Based on the quantitative GSI wall rock grading system and Hoek-Brown strain softening model, FLAC3D numerical simulation software was used to analyze the force characteristics of the full-length cohesive anchor bolt under different length and different constitutive models. The influence of different prestressing anchor The influence of rod force and shear force. The results show that the difference between the axial force and the shear force calculated by the ideal elasto-plastic model and the strain softening model is large. According to the field practical application, the strain softening model can more truly reflect the yield failure process of surrounding rock. Structural design, it is recommended to use strain softening model to calculate, get more accurate calculation results.