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使用PFC3D按照其用户手册上的步骤构建模型时,存在半径放大系数(mul)确定困难、构造的不同属性颗粒体的边界连接程度难以保证等问题。由此,提出了基于“下落法(Particles Fall Method,PFM)”的PFC3D岩土模型的构造方法。该方法根据颗粒岩体的自然形成过程,在规定区域内使颗粒自然下落堆积、压实和充分接触,然后通过删除规定形状外的颗粒进行构型,计算至平衡得到初始地应力场。与经典步骤相比该方法不用计算mul,不用建立边坡墙和土层间的分界墙,不用消除悬浮颗粒;但增加了颗粒下落计算和构型过程。提供了整体下落法(Overall Particles Fall Method,OPFM)和分层下落法(Hierarchical Particles Fall Method,HPFM)两种方式。通过实际工程分析,总体上模型的精确度和构造便捷程度优于经典方法,一次模型构建的成功率较高。
When using PFC3D to build a model according to the procedures in its user manual, there are problems such as difficulty in determining the radius magnification (mul) and difficulty in ensuring the degree of connection of the granular bodies with different attributes. Therefore, the construction method of PFC3D geotechnical model based on “Particle Fall Method (PFM)” is proposed. According to the natural formation process of the granitic rock mass, the method naturally deposits, compacts and fully contacts the granule in a prescribed area, and then calculates the initial ground stress field by balancing the particles obtained by removing the particles with the specified shape. Compared with the classical method, this method does not need to calculate mul. There is no need to establish the boundary wall between the slope wall and the soil layer and eliminate the suspended particles. However, the calculation and configuration process of the particle drop are added. Both the Overall Particles Fall Method (OPFM) and the Hierarchical Particles Fall Method (HPFM) are provided. Through the actual engineering analysis, the overall model accuracy and construction convenience than the classical method, a model building a higher success rate.