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力学与实践 ›› 2019, Vol. 41 ›› Issue (1): 23-29.doi: 10.6052/1000-0879-18-270

• 应用研究 • 上一篇    下一篇

循环载荷下淤泥轻量土的细观变形机理研究1)

冯永2), 张盼盼, 原子然, 刘杰   

  1. 河南工业大学土木建筑学院,郑州 450001
  • 收稿日期:2018-07-24 出版日期:2019-02-20
  • 通讯作者: 2)冯永,副教授, 主要从事岩土工程方面的相关研究和教学。 E-mail: fengyongcivil@foxmail.com
  • 基金资助:
    1)河南省自然科学基金(182300410100)、河南省重点科技攻关项目 (152102310082)资助

STUDY OF MESO-STRUCTURE DEFORMATION MECHANISM OF SILT LIGHTWEIGHT SOIL UNDER CYCLIC LOADING1)

FENG Yong2), ZHANG Panpan, YUAN Ziran, LIU Jie   

  1. School of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China
  • Received:2018-07-24 Online:2019-02-20

摘要: 基于新型室内固结试验及有限元数值模拟分析方法,研究了淤泥轻量土在循环载荷作用下的细观多相变形机理及其宏、细观变形特性之间的相互关系。结果表明,EPS(expanded polystyrene)颗粒掺量及其粒径大小对淤泥轻量土的细观变形特性有显著的影响。试验发现,在所选用的配合比中EPS掺量相差2.0%时,而淤泥轻量土最大体积变形量却相差了4.1%。在相同循环次数下,试样中上、中、下三个点位的EPS颗粒变形量及其应力应变大小关系并不相同,上点位的EPS颗粒变形量最大。通过对不同循环周期下淤泥轻量土各相细观变形关系定量计算分析发现,EPS颗粒变形量在其整个变形过程中占主导地位,平均占到约60%$\sim$80%。该研究可为后续有关EPS淤泥轻量土的微细观结构之间多相耦合作用的研究及其在软土路基填土工程中的应用提供一定的理论支持。

关键词: 淤泥混合轻量土, 循环载荷, 细观结构, 固结试验, 数值模拟

Abstract: In order to reveal the microstructure multi-phase coupling mechanism and the dynamic deformation law of the silt lightweight soil under cyclic loading, the mesoscopic multi-phase deformation mechanism and the relationship between macroscopic and mesoscopic deformation characteristics of lightweight silt soil under cyclic loading are studied by using a new indoor consolidation test and the ABAQUS finite element numerical simulation methods. The results show that the EPS content and the particle size have a significant effect on the meso-deformation characteristics of silt lightweight soil. When the EPS (expanded polystyrene) content differs by 2.0%, the maximum volumetric deformation of the silt lightweight soils differs by 4.1%. Under the same number of cycles, the relations between the deformation and the stress and strain magnitude of the EPS particles at the upper, middle and lower points in the sample are different. The deformation of the EPS particles at the upper point is the largest. The mesoscopic deformation relationship of each phase of the silt lightweight soil in different cycle periods is analyzed by a quantitative calculation. The results indicate that the deformation of the EPS particles is dominant in the whole deformation process of the silt lightweight soil, and the amount is about $60%\sim80%$ on average.

Key words: silt mixed lightweight soil, cyclic loading, meso-structure, consolidation test, numerical simulation

中图分类号: 

  • TU43