层状岩体PFC模拟的细观参数分析

Meso-Scale Parametric Analysis of PFC Simulations of Stratified Rock Masses

【目的】研究层状岩体的非均质性,通过数值模拟的方法建立模型。【方法】基于复合岩体思想,在PFC^(2D)中加入等间距的层理弱面以模拟层岩的各向异性。分析了三轴压缩作用下,数值试件基质细观参数取值的依据。【结果】数值试件的摩擦角随着颗粒间摩擦系数和黏结摩擦角的提高分别呈非线性以及线性增加趋势;数值试件的黏聚力随着颗粒间摩擦系数和黏结摩擦角的提高而呈非线性降低趋势;随着黏结距离的增加,数值试件的摩擦角和黏聚力均呈线性增加趋势。【结论】数值模型可以模拟层状岩体的非均质性。

[Purposes]In order to study the non-homogeneity of the laminated rock mass,the model was developed by numerical simulation.[Methods]In this study,the anisotropy of the laminated rock is simulated by adding equally spaced laminated weak surfaces to PFC^(2D) based on the idea of composite rock mass.[Findings]The results show that the friction angle of the numerical specimen increases nonlinearly and linearly with the increase of inter-particle friction coefficient and bond friction angle,respectively;the cohesive force of the numerical specimen decreases non-linearly with the increase of inter-particle friction coefficient and bond friction angle;the friction angle and cohesive force of the numerical specimen increase linearly with the increase of bond distance.The friction angle and cohesion of the numerical specimens increased linearly with increasing bonding distance.[Conclusions]Numerical models can simulate the non-homogeneity of laminated rock masses.