基于MPS方法的堆石混凝土填充流动数值模拟  

Numerical Simulation for the Filling of RFC Based on MPS Method

作　　者：李敬军 田雷 邱流潮[1] LI Jingjun;TIAN Lei;QIU Liuchao(College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《建筑材料学报》2020年第6期1357-1365,共9页Journal of Building Materials

基　　金：国家自然科学基金资助项目(11772351)。

摘　　要：建立了适合分析和预测堆石混凝土填充密实度的三维移动粒子半隐式法(MPS法),其中将自密实混凝土视为单相均质非牛顿流体,并通过Bingham模型进行描述;使用MPS法对自密实混凝土扩展度试验进行数值模拟计算,并与解析解进行对比,以分析MPS法的计算收敛性和精度,验证该方法的准确性.在验证基础上,通过对L-B形箱试验进行数值模拟,分析了自密实混凝土在堆石孔隙中的流动特点,预测了堆石混凝土的填充状态,并针对屈服强度这一重要影响因素,对堆石混凝土的密实度进行了分析.研究表明:MPS法可以较好地模拟自密实混凝土在堆石体中的流动过程,预测堆石混凝土的密实度,从而为堆石混凝土工程的设计与施工实践提供参考依据.A 3D moving particle semi-implicit(MPS)method was developed to analyze and predict the filling state of rock-filled concrete(RFC).The self-compacting concrete(SCC)was regarded as a single-phase homogeneous non-Newtonian fluid and described by Bingham model.Using MPS method,the numerical simulation of the slump flow test was carried out.By comparing with the analytical solution,the convergence and accuracy of MPS method were analyzed,which verified the accuracy of the method.On this basis,through the numerical simulation of L-B box test,the flow characteristics of SCC rock-filled body was analyzed,the filling state of RFC was predicted,and the influence of yield strength on the compactness of RFC was analyzed.The results show that MPS method can simulate the flow process of SCC in rock-filled body,predict the compactness of RFC,and finally provide reference for the design and construction practice of RFC engineering.

关 键 词：自密实混凝土 堆石混凝土 Bingham流变模型 数值模拟 三维移动粒子半隐式法 坍落扩展度 L-B形箱试验 

分 类 号：TV43[水利工程—水工结构工程]