掺有橡胶粉末砂土液化特性的动三轴试验研究

发布时间：2018-04-15 00:16

  本文选题：孔隙水压力累积 + 橡胶粉末　； 参考：《岩土力学》2017年05期

【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。
[Abstract]:Because of its small weight and strong permeability, rubber powder is often used as filler for slope, subgrade and retaining wall to replace part of sand, thus improving the safety of retaining wall and reducing the amount of sand.Under the action of earthquake or traffic load, the dynamic characteristics of sand mixed with rubber powder, including stress-strain relationship curve, pore water pressure accumulation law, dynamic shear modulus and liquefaction resistance, need to be studied urgently.With the help of CKC cyclic triaxial apparatus, the dynamic characteristics of sand samples mixed with rubber powder under saturated undrained condition were studied, and the influence of rubber powder on the liquefaction resistance of the samples was evaluated.The results show that the influence of pore water pressure on the stress-strain relationship of sand with different size of rubber powder is very significant. At the same time, it is found that rubber powder with larger particle size can greatly improve the liquefaction resistance of the sample.In addition, it is found that the larger the mixing amount, the more obvious the anti-liquefaction ability is, and with the increase of the mixing amount, the failure mode is different from that of conventional sand liquefaction.The research results further clarify the dynamic behavior of sand mixed with rubber powder and provide the technical basis for the application of rubber powder in engineering practice.Finally, the microcosmic mechanism of rubber sand mixing is explained.
【作者单位】： 桂林理工大学广西岩土力学与工程重点实验室;同济大学地下建筑与工程系;
【基金】：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)~~
【分类号】：TU411.8
，

本文编号：1751662