岩土力学 ›› 2018, Vol. 39 ›› Issue (12): 4457-4467.doi: 10.16285/j.rsm.2017.0689

• 基础理论与实验研究 • 上一篇    下一篇

颗粒形状对碎石料孔隙特性影响研究

叶加兵1，张家发2,3，邹维列1   

  1. 1. 武汉大学 土木建筑工程学院，湖北 武汉 430072；2. 长江科学院 水利部岩土力学与工程重点实验室，湖北 武汉 430010； 3. 长江科学院 国家大坝安全工程技术研究中心，湖北 武汉 430010
  • 收稿日期:2017-04-14 出版日期:2018-12-11 发布日期:2018-12-31
  • 通讯作者: 邹维列，男，1969年生，博士，教授，博士生导师，主要从事非饱和土特性、土工合成材料应用、道路中的岩土工程问题等方面的教学和科研工作。E-mail: zwilliam@126.com E-mail:ac.cx@whu.edu.cn
  • 作者简介:叶加兵，男，1990年生，博士研究生，主要从事岩土工程和非饱和土特性方面的研究工作。
  • 基金资助:
    国家自然科学基金项目（No.51279016，No.51479148）；国家重点研发计划课题资助（No.2017YFC1501206）。

Influences of grain shape on pore characteristics of filled breakstone aggregate

YE Jia-bing1, ZHANG Jia-fa2,3, ZOU Wei-lie1   

  1. The shape of grains is one of the main factors influencing the structural characteristics of pores in filled breakstone aggregate, subsequently affecting its mechanical and hydraulic properties. Two sets of limestone gravel aggregate with diameters of 2-5 mm and 5-10 mm were investigated using CT scanning technique and graphic software, from which the pore appearance images of the porous media were acquired. Two sets of glass balls that were with the same granular compositions and porosity as those of the two sets of limestone gravel aggregate were made, and the glass ball sets were compared with the limestone gravel aggregate sets in the test. The threshold value of 0.5 mm opening was applied to the segmentation of pore structure. Three section images of each sample were selected so as to quantitatively analyze pore characteristics by means of the average values of quantitative parameters as the research object. The results show that the pore shape in filled glass ball is more complex than that in filled breakstone. The connectivity degree of pore system in filled breakstone is also less than that in glass ball.
  • Received:2017-04-14 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51279016, 51479148) and the National Key R&D Program of China (2017YFC1501206).

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摘要： 颗粒形状是影响碎石料孔隙特性的主要因素之一，进而影响碎石料的渗透特性和力学行为。选取粒径为2~5 mm和5~10 mm的灰岩碎石颗粒填筑试样，同时与相同级配和孔隙率的玻璃球试样进行对比研究，采用CT扫描技术和图形处理软件获取多孔介质孔隙边界轮廓，选取0.5 mm开度阈值分割孔隙；每组试样选取3张扫描断面图像，取定量参数的平均值为研究对象，对孔隙特性进行定量分析。结果表明：玻璃球多孔介质孔隙形状的复杂性甚于碎石料；玻璃球多孔介质孔隙系统的连通度大于同粒组碎石料。

关键词: 颗粒形状, 孔隙结构, CT扫描, 形状系数, 分形, 连通度

Abstract: The shape of grains is one of the main factors influencing the structural characteristics of pores in filled breakstone aggregate, subsequently affecting its mechanical and hydraulic properties. Two sets of limestone gravel aggregate with diameters of 2-5 mm and 5-10 mm were investigated using CT scanning technique and graphic software, from which the pore appearance images of the porous media were acquired. Two sets of glass balls that were with the same granular compositions and porosity as those of the two sets of limestone gravel aggregate were made, and the glass ball sets were compared with the limestone gravel aggregate sets in the test. The threshold value of 0.5 mm opening was applied to the segmentation of pore structure. Three section images of each sample were selected so as to quantitatively analyze pore characteristics by means of the average values of quantitative parameters as the research object. The results show that the pore shape in filled glass ball is more complex than that in filled breakstone. The connectivity degree of pore system in filled breakstone is also less than that in glass ball.

Key words: grain shape, pore structure, CT scanning, shape parameter, fractal, connectivity degree

中图分类号: 

  • TU451
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