Abstract This paper introduces a simplified smooth rock reinforcement modeling approach based on the 2D combined finite discrete element method (FDEM). The goal is to facilitate modeling the end grouting process and the full grouting process of rock bolts reinforcement, and to improve further understanding of the interaction between bolt, grouting, and host rock based on material mechanical behavior. The study analyzed the mechanical model and fracture mode extracted from experimental results using the rebar bolt specimen. This facilitated the study of the bond strength component of the rib. Then, the bond force-slip relationship was explored using physical modeling with different combinations of bolt and cover constraints, with different types of grouts and rocks. Corroboration of the laboratory axial pullout test was then conducted. A power law for the stress-displacement of the radial component of bond force was generated, to elaborate simplified modeling method and the data range of parameters in the diverse combination of constraining forces. Then, the action law was implemented into the material rock reinforcement model in FDEM. The verification process, done by comparing the bond force-slip curve with the physical modeling, shows the model can effectively reflect the action rule of rebar bolts. The model simplifies rebar bolt modeling and adds a new ability to model rock reinforcement features into FDEM, making the FDEM technology extend fundamentally.

中文翻译：

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二维FDEM中材料建模岩石加固数值分析及参数研究

摘要 本文介绍了一种基于二维组合有限离散元法（FDEM）的简化光滑岩石加固建模方法。目标是促进对锚杆加固的末端注浆过程和全注浆过程进行建模，并根据材料力学行为进一步了解锚杆、注浆和围岩之间的相互作用。该研究使用钢筋螺栓试样分析了从实验结果中提取的力学模型和断裂模式。这有助于研究肋的结合强度分量。然后，使用物理建模与螺栓和覆盖层约束的不同组合以及不同类型的灌浆和岩石来探索粘结力-滑移关系。然后进行实验室轴向拉拔试验的验证。生成了结合力径向分量应力位移的幂律，详细阐述了简化建模方法和各种约束力组合中参数的数据范围。然后，在FDEM中将作用规律应用到材料岩石加固模型中。通过将粘结力-滑移曲线与物理建模进行比较，验证过程表明该模型可以有效地反映钢筋螺栓的作用规律。该模型简化了钢筋锚杆建模，并在 FDEM 中添加了对岩石加固特征进行建模的新功能，使 FDEM 技术得到了根本性的扩展。作用律在FDEM的材料岩石加固模型中实施。通过将粘结力-滑移曲线与物理建模进行比较，验证过程表明该模型可以有效地反映钢筋螺栓的作用规律。该模型简化了钢筋锚杆建模，并在 FDEM 中添加了对岩石加固特征进行建模的新功能，使 FDEM 技术得到了根本性的扩展。作用律在FDEM的材料岩石加固模型中实施。通过将粘结力-滑移曲线与物理建模进行比较，验证过程表明该模型可以有效地反映钢筋螺栓的作用规律。该模型简化了钢筋锚杆建模，并在 FDEM 中添加了对岩石加固特征进行建模的新功能，使 FDEM 技术得到了根本性的扩展。