To investigate the influence of microscopic parameters on macroscopic properties in parallel bonding models,the particle flow discrete element software PFC3D was used to simulate the direct shear test of concrete,and the influ-ence of mesoscopic parameters in the parallel bond model on the macroscopic characteristics was studied.Through the control variable method,the effects of particle friction coefficient,effective modulus of parallel bond contact,friction angle of parallel bond contact,tensile strength of parallel bond contact,cohesion of parallel bond contact and normal stress on the direct shear test results of concrete were analyzed.The results show that the friction coefficient only slight-ly affects the shear stress-horizontal shear displacement curve,that is,after the peak shear stress,the decrease of the curve decreases with the increase of the friction coefficient.The effective modulus of parallel bond contact mainly af-fects the slope of shear stress-horizontal shear displacement curve (shear stiffness).With the increase of effective mod-ulus,the slope increases and is linear.The parallel bond contact friction angle,the parallel bond contact tensile strength and the parallel bond contact cohesion mainly affect the peak value of the shear stress-horizontal shear dis-placement curve (shear strength).
关键词
混凝土/离散元模拟/细观参数/直剪试验
Key words
concrete/discrete element simulation/mesoscopic parameters/direct shear test
维普
万方数据