›› 2017, Vol. 38 ›› Issue (5): 1343-1349.doi: 10.16285/j.rsm.2017.05.015

• 基础理论与实验研究 • 上一篇    下一篇

掺有橡胶粉末砂土液化特性的动三轴试验研究

李 博1, 2,黄茂松2   

  1. 1. 桂林理工大学 广西岩土力学与工程重点实验室,广西 桂林 541004;2. 同济大学 地下建筑与工程系,上海 200092
  • 收稿日期:2015-06-13 出版日期:2017-05-11 发布日期:2018-06-05
  • 作者简介:李博,男,1982年生,博士后,副教授,主要从事土动力学、抗震减灾方面的研究与教学工作。
  • 基金资助:

    广西岩土力学与工程重点实验室资助课题(No. 13-KF-04);浙江省自然科学基金(No. LY17E080012);国家自然科学基金(No. 11372228)。

Dynamic triaxial tests on liquefaction characteristics of rubber-sand mixture

LI Bo1, 2, HUANG Mao-song2   

  1. 1. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, Guangxi, 541004, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China
  • Received:2015-06-13 Online:2017-05-11 Published:2018-06-05
  • Supported by:

    This work was Funded by the Key Laboratory of Geomechanics and Geotechnical Engineering of Guangxi Province (13-KF-04), the Natural Science Foundation of Zhejiang Province (LY17E080012) and the National Natural science Foundation of China(11372228).

摘要: 由于重度小、渗透性强,橡胶粉末常作为边坡、路基和挡土墙的填料,以代替部分砂土,从而提高挡土墙的安全性,并减少砂子的用量。在地震或交通荷载作用下,掺有橡胶粉末的砂土动力学特性,包括应力-应变关系曲线、孔隙水压力累积规律、动剪切模量和抗液化能力方面的研究亟需开展。借助CKC循环动三轴仪,开展饱和不排水条件下掺有橡胶粉末的砂土试样的动力学特性研究,重点评估掺入的橡胶粉末对试样的抗液化性能的影响。研究结果发现,掺有不同粒径橡胶粉末的砂土对应力-应变关系、孔隙水压力的影响非常显著,同时发现,粒径较大的橡胶粉末可以极大地提高试样的抗液化能力。另外,发现掺入量越大,对抗液化能力的提高越明显,且随着掺入量的提高,表现出与常规砂土液化不同的破坏模式。研究结果进一步明确了掺有橡胶粉末的砂土动力特性行为,为橡胶粉末在工程实践中的应用提供了技术依据。最后,对橡胶砂土混合的微观机制进行了解释。

关键词: 孔隙水压力累积, 橡胶粉末, 抗液化能力, 循环动三轴试验

Abstract: Recycled tire wastes mixed with soils are applicable as lightweight filling material for slopes, sub-bases of pavements and retaining walls to improve the safety of the retaining walls. Under the seismic loadings, e.g., earthquake or traffic loads, the dynamic responses of granulated rubber/soil mixtures, such as the evolution of stress-strain, rule of cumulative pore water pressure, dynamic shear modulus, and liquefaction resistance, are essential in the design of such a system. This paper investigates the dynamic responses, liquefaction resistance mainly, of recycled rubber tire powder through mixtures with different tire powder sizes in saturated condition using cyclic triaxial tests. The results show that the larger tire powder size significantly improved liquefaction resistance of granular materials. Meanwhile, the incorporations of tire powder changes the deformation pattern and the evolution of pore water pressure compared to the pure sand. The attempt is to further explain the evolved dynamic behavior of the mixture. And the results as a supplement enrich the database of dynamic behavior of soil rubber mixture as lightweight filling material in saturated condition. Finally, the results are interpreted from the microscopic view of the point.

Key words: pore pressure build-up, tire crumb, liquefaction resistance, cyclic triaxial test

中图分类号: 

  • TU 473.1

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