长江科学院院报 ›› 2017, Vol. 34 ›› Issue (11): 61-65.DOI: 10.11988/ckyyb.20160795

• 岩土工程 • 上一篇    下一篇

基于PFC2D的岩土体孔隙统计算法分析

袁俊平a,b,史宇宙a,b,丁国权a,b,王强林a,b   

  1. 河海大学 a.岩土力学与堤坝工程教育部重点实验室; b.江苏省岩土工程技术工程研究中心,南京 210098
  • 收稿日期:2016-08-09 出版日期:2017-11-01 发布日期:2017-11-19
  • 通讯作者: 史宇宙(1992-),男,江苏徐州人,硕士研究生,主要从事堤坝与道路工程方面的研究工作,(电话)18251823617(电子信箱)shi_yuzhou@126.com。
  • 作者简介:袁俊平(1975-),男,湖北麻城人,副教授,博士,主要从事非饱和土和堤坝工程方面的研究工作,(电话)13815861109(电子信箱)yuan_junph@163.com。
  • 基金资助:
    国家自然科学基金项目(51378008);中央高校基本科研业务费项目(B15020060)

Statistical Algorithms for Pore Size Distribution of Rock-soil Mass Based on PFC2D

YUAN Jun-ping1, 2, SHI Yu-zhou1, 2, DING Guo-quan1, 2, WANG Qiang-lin1, 2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
    2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China
  • Received:2016-08-09 Online:2017-11-01 Published:2017-11-19

摘要: 为了研究岩土材料微观孔隙结构特性,从机理上认识和掌握其宏观工程性质及其变化规律,基于PFC2D模拟岩土材料孔隙结构,对像素颗粒填充法的计算误差、像素颗粒尺寸选择及孔隙统计算法等进行了研究。研究结果表明:综合考虑误差控制与计算效率,建议最小土石颗粒半径的1/20为适合的像素颗粒半径;对比孔隙体积统计的3种算法发现,舍入法是相对最优算法。在此基础上实现了等效孔径分布的统计,为三维孔隙结构模型的研究提供了理论依据,为进一步对岩土材料孔隙结构特性及其与宏观力学行为和工程性质间关系的研究提供了基础。

关键词: 孔隙结构, 像素颗粒填充法, 二维颗粒流软件, 等效孔径分布曲线, 舍入法

Abstract: The purpose of this research is to obtain the microscopic structural characteristics and the variation rules of macroscopic engineering properties of rock and soil materials. We discussed the issues of statistical error, pixel size, and statistical algorithms for pixel-particle-filling method by simulating pore structures in rock and soil samples using PFC2D (2-dimensional particle flow code). Results show that taking into account both statistical error and algorithmic efficiency, we recommend 1/20 of the radius of the smallest particle as the proper radius for pixel-particle-filling used for pore structure statistics. We also compared three pore volume statistical algorithms and found that round-off method is the optimal. Moreover, we proposed a method to obtain the curve of equivalent pore size distribution, based on which further research works are able to be conducted on the 3D pore structures model, the characteristics of the pore structures and the relationship among these characteristics and macro-mechanical behaviors and engineering properties of rock-soil.

Key words: pore structure, pixel-particle-filling method, PFC2D, equivalent pore size distribution curve, round-off method

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