Li Li-Hua, Chen Yan-Jun, Ferreira Pedro Miguel Vaz, Liu Yong, Xiao Heng-Lin
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.
Materials (Basel). 2017 Jun 27;10(7):707. doi: 10.3390/ma10070707.
Waste tires have excellent mechanical performance and have been used as reinforcing material in geotechnical engineering; however, their interface properties are poorly understood. To further our knowledge, this paper examines the pull-out characteristics of waste tire strips in a compacted sand, together with uniaxial and biaxial geogrids also tested under the same conditions. The analysis of the results shows that the interlocking effect and pull-out resistance between the tire strip and the sand is very strong and significantly higher than that of the geogrids. In the early stages of the pull-out test, the resistance is mainly provided by the front portion of the embedded tire strips, as the pull-out test continues, more and more of the areas towards the end of the tire strips are mobilized, showing a progressive failure mechanism. The deformations are proportional to the frictional resistance between the tire-sand interface, and increase as the normal stresses increase. Tire strips of different wear intensities were tested and presented different pull-out resistances; however, the pull-out resistance mobilization patterns were generally similar. The pull-out resistance values obtained show that rubber reinforcement can provide much higher pull-out forces than the geogrid reinforcements tested here, showing that waste tires are an excellent alternative as a reinforcing system, regardless of the environmental advantages.
废旧轮胎具有优异的力学性能，已被用作岩土工程中的增强材料；然而，人们对其界面特性了解甚少。为了进一步增进我们的认识，本文研究了压实砂土中废旧轮胎条带的拉拔特性，同时还对单轴和双轴土工格栅在相同条件下进行了测试。结果分析表明，轮胎条带与砂土之间的咬合效应和拉拔阻力非常强，明显高于土工格栅。在拉拔试验的早期阶段，阻力主要由埋入轮胎条带的前部提供，随着拉拔试验的持续进行，越来越多靠近轮胎条带末端的区域被调动起来，呈现出渐进破坏机制。变形与轮胎 - 砂土界面之间的摩擦阻力成正比，并随着法向应力的增加而增大。对不同磨损强度的轮胎条带进行了测试，其呈现出不同的拉拔阻力；然而，拉拔阻力的 mobilization 模式通常相似。所获得的拉拔阻力值表明，橡胶增强材料能够提供比本文测试的土工格栅增强材料高得多的拉拔力，这表明废旧轮胎作为一种增强系统是一种极佳的选择，且不论其环境优势。 （注：“mobilization”此处可能结合上下文有特定含义，不太明确准确意思，可根据实际情况调整译文表述）
