基于颗粒流的模拟岩石结构面细观参数敏感性研究

Study on Sensitivity of Microscopic Parameters of Simulated Rock Structure Plane Based on Particle Flow

为确定基于颗粒流软件(PFC5.0)的颗粒流模型敏感性细观参数,利用数值试验,采用控制变量法研究细观参数对模拟岩石结构面各宏观力学参数的影响规律。结果表明:单轴抗压强度与平行黏结抗拉强度之间符合线性函数增长关系,与平行黏结黏聚力之间符合对数函数增长关系,与平行黏结摩擦角未表现出明显的函数关系;弹性模量与平行黏结抗拉强度之间符合线性函数增长关系,与平行黏结黏聚力之间符合对数函数增长关系,与平行黏结摩擦角未表现出明显的函数关系;泊松比与上述3个细观参数之间符合对数函数衰减关系;峰值抗剪强度与光滑节理黏结抗拉强度和光滑节理黏结黏聚力之间表现为线性函数增长关系,与光滑节理摩擦角之间符合对数函数增长关系。

In order to determine the sensitivity of the particle flow model based on the PFC5. 0 software,analysis the influence of the microscopic parameters on the macroscopic mechanical parameters of the simulated rock mass by numerical experiments. The results show that the relationship between the uniaxial compressive strength and the parallel bond tensile strength conforms to the growth of the linear function and the logarithmic function growth relationship with the parallel bond cohesion,which does not show a significant function relationship with the parallel bond friction angle; The relationship between the elastic modulus and the parallel bond tensile strength conforms to the linear function growth relationship,and the parallel bond cohesion is in accordance with the logarithmic function growth relationship,and the parallel bond friction angle does not show a significant function relationship; Poisson’s ratio is logarithmic function attenuation relationship with the above three microscopic parameters; The relationship between the peak shear strength and the smooth joint bond tensile strength and the smooth joint bond cohesion is linearly growing,and the smooth joint friction angle coincides with the logarithmic function growth relationship.