废弃橡胶轮胎-砂土复合体的承载试验研究

为探索地基加固新方法,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;在有、无侧限条件下,轮胎内壁的应力分布规律存在较大差异;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。

Experimental study on the load bearing capacity of waste rubber tire-sand composite

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 with the waste rubber tire hooping granular material was proposed. The elastic modulus of discarded rubber tire was obtained by carrying out tensile testing on rubber tire strip. By using axial compression test on waste rubber tires-sand composite, the rules were discussed, including the influence of loading system and lateral conditions on the foundation bearing capacity, stress distribution of inner wall of tire, and soil stress inside the laminated body. The results show that, compared with fast and slow loading system, the sedimentation of the superposition is the smallest, and the self-recovery ability and bearing capacity are optimal when loading and unloading in one direction. The bearing capacity of the composite is higher when under confined condition, 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 around the inner wall of the tire is quite different. In the same radial plane, the closer to the center of the superposition, the smaller the effect of rubber tire ring, and the greater the soil stress.