基于平行黏结模型的类岩石材料宏细观参数影响

为了研究材料宏观力学特性与细观参数的关系并进行细观参数标定,将平行黏结模型作为颗粒的接触模型,对颗粒流程序中的细观参数进行正交试验设计,结合室内试验确定类岩石材料的细观参数。结果表明:类岩石材料宏观弹性模量主要由颗粒模量、平行黏结模量以及半径乘子影响;法向黏结强度与切向黏结强度共同影响抗压强度,且不同黏结强度比对裂纹的分布有影响;泊松比主要由颗粒刚度控制,且颗粒刚度越大,剪切裂纹占比越大。物理试验与数值模拟的峰值应力接近,应力-应变曲线基本吻合,裂纹扩展形态一致,表明细观参数结果可靠,为其他岩石材料颗粒流模拟提供借鉴。

Study on the influence of macro and micro parameters on rock-like materials of parallel bonding model

Abstract: in order to study the macro mechanical properties and the relationship between the mesoscopic parameters and material, mesoscopic parameters calibration will contact model of parallel bond model as a particle, particle flow code (PFC) in the program of mesoscopic parameters orthogonal experiment design, combined with laboratory tests to determine the type of rock material mesoscopic parameters results show that the kind of the macro elastic modulus of rock material is mainly composed of particle radius of parallel compressive modulus and modulus of multiplier effect; Normal bonding strength and tangential bonding strength affect the compressive strength, and different bonding strength ratios affect the crack distribution. Poisson''s ratio is mainly controlled by particle stiffness, and the larger the particle stiffness is, the larger the proportion of shear crack will be. The physical test is close to the peak stress of numerical simulation, the stress-strain curve is basically consistent, and the crack growth morphology is consistent, which indicates that the results of mesoscopic parameters are reliable, and provides reference for the particle flow simulation of other rock materials.