Zhang Hongbo, Wang Hao, Li Yingyong, Yuan Xuefeng, Sun Jie, Song Xiuguang, Zhao Zhizhong, Wu Jianqing
School of Qilu Transportation, Shandong University, Jinan, 250061, China.
Shandong Provincial Transportation Service Center, Jinan, 250014, China.
Environ Sci Pollut Res Int. 2022 May;29(24):35599-35614. doi: 10.1007/s11356-021-16313-z. Epub 2022 Mar 5.
The recycling of scrap tires has become an important issue in the area of environmental protection in the past 20 years. In recent years, tire strips and tire-derived aggregates (TDA) have been used in geotechnical engineering projects. Both reinforcement methods are proved available to improve the horizontal resistance of stabilized structures. This study reported a new method which combined tire strips and TDA utilization in order to investigate if such combinations could further improve the stability of retaining structures. The shear properties of TDA reinforced sand with different tire content levels (0%, 10%, 20%, and 30%) were measured using direct shear tests. The pullout behaviors of tire strips with and without transverse ribs embedded in pure sand/TDA reinforced materials were then compared. Based on the obtained results, a new calculation method was proposed for the estimation of the peak pullout resistance of tire strips embedded in TDA-reinforced sand, with the interference of transverse ribs and different tire content levels of the TDA-reinforced sand taken into consideration. The test results revealed that a tire content level of 20% was the optimal proportion of TDA-reinforced sand. Meanwhile, the model tests proved that the end resistance provided by transverse ribs could largely enhance the ultimate pullout capacity of soil structures. Therefore, it was concluded that the proposed methods were feasible in scrap tire recycling projects, and the test results and proposed calculation method could potentially provide important references for the future designs and construction of tire strip stabilized retaining walls.
在过去20年里，废旧轮胎的回收利用已成为环境保护领域的一个重要问题。近年来，轮胎条和轮胎衍生骨料（TDA）已被用于岩土工程项目。事实证明，这两种加固方法都可用于提高稳定结构的水平阻力。本研究报告了一种将轮胎条和TDA利用相结合的新方法，以研究这种组合是否能进一步提高挡土墙的稳定性。通过直接剪切试验测量了不同轮胎含量水平（0%、10%、20%和30%）的TDA加筋砂的剪切特性。然后比较了纯砂/TDA加筋材料中有无横向肋条的轮胎条的拔出性能。基于所得结果，提出了一种新的计算方法，用于估算埋入TDA加筋砂中的轮胎条的峰值拔出阻力，该方法考虑了横向肋条的干扰和TDA加筋砂的不同轮胎含量水平。试验结果表明，20%的轮胎含量水平是TDA加筋砂的最佳比例。同时，模型试验证明，横向肋条提供的端阻力可大大提高土体结构的极限拔出能力。因此，得出结论，所提出的方法在废旧轮胎回收项目中是可行的，试验结果和所提出的计算方法可能为未来轮胎条稳定挡土墙的设计和施工提供重要参考。
