透水混凝土不同孔隙率下细观数值模拟研究

Research permeable concrete mesoscopic numerical simulation under different porosity

为了能够利用数值分析方法研究透水混凝土的物理、力学性能,基于蒙特卡罗法随机分布原理,采用APDL语言结合有限元软件建立了孔隙率分别为5%、7.5%、10%和12.5%的4组透水混凝土试块三维结构模型,孔隙随机分布,计算分析各组试块在不同荷载作用下的受力情况。结果表明:建立的三维模型孔隙分布特征接近真实的透水混凝土结构;受力分析显示:透水混凝土的强度值随着孔隙率的增大而降低;剖面云图显示孔隙率越大,试块内部的应力集中现象也愈加明显,在相同位移荷载作用下,孔隙率高的试块在内部孔隙附近最先出现最大应力,并随之破坏,受力不再增加,抗压强度低。

In order to be able to use the numerical analysis method to study the physical and mechanical properties of permeable concrete, based on monte carlo method random distribution principle, using APDL language combined with finite element software established porosity were 5%, 7.5%, 10% and 5% respectively the four groups of permeable concrete block 3D structure model , random pore distribution, calculation and analysis each block stress distribution under different load.The results show that the established 3D model of pore distribution close to the re-al permeable concrete structure ;the strength of the force analysis shows that the strength of the permeable concrete is decreased with the increase of porosity;profile cloud images show that the greater the block internal stress con-centration phenomenon is more obvious under the big porosity.In addition, under the same displacement load, the first maximum stress appear near the inner pore of high porosity block, and then destruction and can＇t bear the load, the compressive strength is low.