废弃橡胶轮胎-砂土复合体的承载试验研究
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沈阳建筑大学

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中图分类号:

TU47

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Experimental study on load bearing of waste rubber tire-sand composite
Author:
Affiliation:

Shenyang Jianzhu University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    为探索地基加固新方法,并解决废弃橡胶轮胎堆放引起的环境问题,提出了一种废弃橡胶轮胎环箍散体材料的新型复合地基。通过橡胶轮胎条拉伸试验,得到废弃橡胶轮胎的弹性模量;通过废弃橡胶轮胎-砂土复合体轴压试验,分析加载制度和侧限条件对地基承载力的影响规律、轮胎内壁的应力分布规律及复合体内部土应力变化规律。结果表明:与快、慢速加载制度相比,单向往复加卸载时复合体的承载性能和自恢复能力最优;有侧限条件下复合体的承载性能较好,但侧限条件对复合体的自恢复能力没有影响;有、无侧限条件下,轮胎内壁的应力分布规律存在很大差异;同一径向平面上,距复合体中心处越近,受橡胶轮胎环箍效应的影响越小,土应力值越大。研究结果可为废弃橡胶轮胎-砂土复合体复合地基的实际应用提供理论指导。

    Abstract:

    In order to explore a new method of foundation reinforcement and solve the environmental problems caused by waste rubber tire stacking, a new type of foundation for the waste rubber tire hoop bulk material was proposed. The elastic modulus of discarded rubber tire was obtained by carrying out tensile test of rubber tire strip. Using waste rubber tires-sand composite axial compression test, the rules were discussed including the influence law of loading system and lateral conditions on foundation bearing capacity, stress distribution of inner wall of tire and variation law of soil stress inside laminated body. The results show that compared with fast and slow loading system, the sedimentation of the superposition is the smallest when loading and unloading in one direction, the self-recovery ability and bearing capacity are optimal. The bearing capacity of the composite is better under confined conditions, but the self-recovery ability of the composite is not affected by confined condition. Under the condition of no or no limitation, the stress distribution law of the inner wall of the tire is very different. In the same radial plane, the closer to the center of the superposition, the smaller the effect of rubber tire ring, and the larger the soil stress. The research results can provide theoretical guidance for the practical application of the waste rubber tire-sand composite composite foundation .

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历史
  • 收稿日期:2019-05-10
  • 最后修改日期:2019-07-25
  • 录用日期:2019-09-02
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