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渗透系数是级配碎石渗流特性的重要参数,通过颗粒流数值方法建立碎石土渗流计算模型,利用流动方程和水压方程以及碎石之间的应力变形响应进行耦合计算,得到相应级配碎石的渗流系数,数值计算结果表明:颗粒流数值分析方法(PFC)适用于模拟任意形状、大小的单元集合体,允许单元在受力过程中发生开裂和运动.颗粒流不需要给出材料的宏观参数,只需给出材料的细观参数,通过细观结果的累加,PFC可以模拟材料在宏观状态下的表象.给出的9种级配碎石的渗透性远大于规范要求的级配集料的渗透系数,渗透系数均满足工程要求,但综合比较,孔隙率较大的碎石3类较优.
The permeability coefficient is an important parameter of seepage property of graded macadam. The numerical model of particle flow is used to establish the seepage model of macadam soil. Coupling calculation is made by using flow equation and pressure equation and stress-strain response between gravels, and the corresponding gradation The results of numerical calculation show that PFC is suitable for simulating unit shape assemblies of arbitrary shape and size, which allows the unit to crack and move during the stress. Particle flow does not need to be given material , Only the mesoscopic parameters of the material are given, and the PFC can simulate the appearance of the material in the macroscopic state through the summation of the meso-scale results.The permeability of the 9 graded macadam is much larger than that required by the specification With the aggregate permeability coefficient, permeability coefficient to meet the engineering requirements, but a comprehensive comparison of the larger porosity of the three types of gravel better.