孔隙介质渗透力的细观数值解析.PDF

第35卷第4期 水 利 水 电科 技 进 展 2015年7月 Vol.35 No.4 Advances in Science and Technology of Water Resources Jul. 2015 DOI:10.3880/ j.issn.1006 7647.2015.04.009 孔隙介质渗透力的细观数值解析 蒋中明,王摇 庆,秦卫星 (长沙理工大学水利工程学院,湖南 长沙摇 410004) 摘要:为深入理解孔隙介质中的渗透力概念,分析了渗透力的力学本质,明确了渗透力的定义。 从 细观角度分析了渗流条件下土颗粒受力特点以及PFC3D对单一颗粒在渗流条件下的渗流作用力 计算方法,建立了渗透力数值计算的细观颗粒流分析模型,利用PFC3D的流固耦合分析功能,研究 了渗流条件下孔隙介质土体渗透力特性及数值大小。 渗透力数值解与解析解对比分析结果表明: 采用基于细观理论的PFC3D研究孔隙介质在渗流条件下的宏观受力特点是可行的;渗透力由所有 土颗粒表面的法向应力和黏滞切向力合成。 关键词:孔隙介质;渗透力;细观力学;土力学;PFC3D;数值分析 + 中图分类号:TU441 .33摇 摇 摇 文献标志码:A摇 摇 摇 文章编号:1006 7647(2015)04 0035 04 Numerical interpretation of seepage force in porous media based on micromechanics/ / JIANG Zhongming,WANG Qing,QIN Weixin(School of Hydraulic Engineering,Changsha University of Science and Technology,Changsha 410004, China) Abstract:In order to deeply understand the concept of seepageforce in porous media,its mechanical essence is analyzed and its definition is exactly given. From the perspective of micromechanics,the mechanical characteristics of soil particle under percolation condition is analyzed,and the calculation method of singular particle爷s seepage force under percolation condition employed in particle flow code in three dimensions(PFC3D) is discussed. Additionally,the analysis model of mesoscopic particleflow for calculating seepage force value is built. By using the fluid鄄solid coupling analysis function of PFC3D,the features and values of soil seepage force of porous media under percolation condition are studied. Through comparing the valueof seepageforceobtainedbynumericalmethodwiththatby analytical solution,theresultsindicatethat it isfeasible to study the macro鄄characteristics of