广东工业大学学报 ›› 2017, Vol. 34 ›› Issue (04): 41-46.doi: 10.12052/gdutxb.160177

• 综合研究 • 上一篇    下一篇

软土固结过程中基于分形理论的孔隙微观参数研究

周晖, 吴俊桦   

  1. 广州城建职业学院 建筑工程学院, 广东 广州 510925
  • 收稿日期:2016-12-19 出版日期:2017-07-09 发布日期:2017-07-09
  • 作者简介:周晖(1979–)，女，副教授，博士，主要研究方向为岩土工程.
  • 基金资助:

    广东省高等学校优秀青年教师培养计划项目（Yq201462）；广东省品牌专业建设项目（2016gzpp016）；亚热带建筑科学国家重点实验室自主研究课题（2017KB16）

A Research on Microscopic Parameters of Soft Soil Pore Based on Fractal Theory in the Process of Consolidation

Zhou Hui, Wu Jun-hua   

  1. School of Civil Engineering and Architecture, Guangzhou City Construction College, Guangzhou 510925, China
  • Received:2016-12-19 Online:2017-07-09 Published:2017-07-09

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摘要：

由于土体微观结构具有多向性及不均匀性，可以使用分形模型来模拟土的微观结构并对其进行定量描述.基于Sierpinski分形模型，对珠江三角洲地区软土固结过程中的ESEM图片进行测试，分析软土固结过程中的微观特征变化，定义了一个能够反映软土孔隙的大小、形状、分布以及排列定向性的微观参数——孔隙结构影响因子Fs.研究表明，孔隙结构影响因子能够正确评价软土孔隙的变化，与固结荷载、渗透系数以及压缩系数都具有十分明显的相关性；同级荷载下，原状土的孔隙结构影响因子比重塑土的要大，但是当荷载增加到一定程度时，两者趋于一致；当固结荷载增加到一定程度时，孔隙结构影响因子的地区差异减弱，最终都趋于18左右.

关键词: 珠江三角洲软土, 孔隙微观参数, 分形理论

Abstract:

As the microstructure of soil is politropic and heterogeneous, the microstructure of soil can be simulated by fractal model and described with fractal parameters. The Pearl River Delta(PRD) soft soil environmental scanning electron microscope (ESEM) pictures are tested and the change of microscopic features in the process of soft soil consolidation analyzed based on the Sierpinski fractal model. A parameter which reflects the size, shape, distribution and orientation in the alignment of soft soil pore is defined and this parameter named as impact factor of pore. The research shows that this parameter can give a correct evaluation to the change of soft soil pore. There is an obvious relativity between this parameter and the consolidation load, the permeability coefficient and the compression coefficient. The parameter of natural soil is larger than the remolded soil in the same consolidation load, but they are equal when the load is large enough. The parameters which come from different areas would be the same when the consolidation load is large enough and approximates 18.

Key words: soft soil in Pearl River Delta(PRD), pore microscopic parameters, fractal theory

中图分类号: 

  • TU411.92

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