管涌的砂槽试验研究及颗粒流模拟  

Study on Piping by Sand-bank Model Andsimulation by PFC^(3D)

作　　者：倪小东[1,2] 王媛[1,2] 王飞[1,2] 

机构地区：[1]岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098

出　　处：《四川大学学报（工程科学版）》2009年第6期51-57,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：973国家重点基础研究发展计划(2007CB714102)

摘　　要：为了揭示管涌发展的细观机理,分析了土体内部细颗粒运移引起管涌破坏的动态过程,进行了管涌砂槽模型试验和颗粒流数值模拟,根据数值模拟结果,分析了管涌发展过程中试样细观变化规律及流体的变化规律,并与砂槽模型试验结果进行了比较。结果表明在不同的颗粒组成、孔隙率大小和渗径长度下数值模拟获得的临界水力梯度与室内试验结果均比较接近,从而证明了采用颗粒流程序研究管涌问题是合理的,为从细观尺度上解释和分析管涌现象提供了一条新的途径。In order to show the meso-mechanical of piping in sandy soils,the dynamic process of piping caused by the transportation of fine particles in the soil is studied by sand launder model test of piping and numerical simulation of PFC.Based on the results of the numerical simulation,the rules of the sample's meso movement and the liquid's movement are studied and are compared with the results of sand launder model test.The result indicates that the critical hydraulic gradient derived by numerical simulation is ...

关 键 词：管涌 模型试验 颗粒流 数值模拟 水力梯度 

分 类 号：TV871[水利工程—水利水电工程]