The purpose of this research is to obtain the shear performance of scrap tire strip-loess mixture, thus improving the recycled utilization through optimizing the dosage and shape parameter of scrap tire strip. Indoor shear tests were conducted on large-scale direct shear apparatus Shear Trac-Ⅲ. The dosage of scrap tire strips were designed at 0%, 10%, 20%, 30%, 100%, and the length-width ratio of scrap tire strip at 1, 2, 4, and 8 to examine the influences of dosage and shape parameter on the shear strength of the mixture. Results revealed that except for plain soil and soil mixture with 10% of scrap tire strip, the mixture specimens all displayed strain hardening behavior. Increments in dosage and length-width ratio of scrap tire strip had evident impact on improving cohesion, but small impact on internal friction angle. Within the test range, the optimal dosage of scrap tire strip is 20%. At this dosage, the cohesion of soil mixture increased by 56.5% compared with that of plain soil. Under normal stress of 24 kPa and 48 kPa, the soil mixture had large shear strength when the optimal length-width ratio was 4, while under normal stress of 96 kPa and 144 kPa,large shear strength can be achieved when the length-width ratio equaled 2. The shear strength of scrap tire strip-loess mixture was up to 22% higher than that of plain soil, indicating a remarkable amelioration of loess by using scrap tire strips.
Key words
large-scale scrap tire strip /
loess /
dosage /
length-width ratio;shear performance
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References
[1] ZORNBERG J G, CABRAL A R, VIRATJANDR C. Behaviour of Tire Shred-Sand Mixtures.Canadian Geotechnical Journal, 2004, 41(2):227-241.
[2] FOOSE G J, BENSON C H, BOSSCHER P J. Sand Reinforced with Shredded Waste Tires. Journal of Geotechnical Engineering, 1996, 122(9):760-767.
[3] XIAO M, LEDEZMA M, HARTMAN C. Shear Resistance of Tire-Derived Aggregate Using Large-Scale Direct Shear Tests. Journal of Materials in Civil Engineering, 2013,27 (1):04014110.
[4] MASHIRI M S, VINOD J S, SHEIKH M N, et al. Shear Strength and Dilatancy Behaviour of Sand-tyre Chip Mixtures.Soils and Foundations, 2015, 55(3): 517-528.
[5] 魏永耀,孙树林,郑华章.膨胀土-胶粉(ESR)强度特性室内试验研究.工程地质学报,2010,18(4):543-547.
[6] 孙树林,魏永耀,张 鑫.废弃轮胎胶粉改良膨胀土的抗剪强度研究.岩石力学与工程学报,2009,28(增刊1):3070-3075.
[7] 李丽华,肖衡林,郑俊杰,等.废旧轮胎加筋路堤边坡模型试验研究.工程力学,2015,32(11):79-85.
[8] 李丽华,肖衡林,唐辉明,等.轮胎颗粒混合土动力特性参数影响规律试验研究.岩土力学,2014,35(2):359-364,422.
[9] 李朝晖,张虎元.废轮胎颗粒与黄土混合物剪切特性研究.岩土力学,2012,33(10):3013-3019.
[10] EL-SHERBINY R, YOUSSEF A, LOTFY H. Triaxial Testing on Saturated Mixtures of Sand and Granulated Rubber∥American Society of Civil Engineers, Geo-Congress 2013, San Diego, California, United States, March 3-7, 2013: 82-91.
[11] 李珊珊,李大勇.废旧轮胎橡胶颗粒与黏土混合土的剪切特性.长江科学院院报,2017,34(7):99-105.
[12] GB/T 50123—1999,土工试验方法标准.北京: 中国计划出版社, 1999.
[13] LEE J H, SALGADO R, BERNAL A, et al. Shredded Tires and Rubber-Sand as Light-weight Backfill. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(2):132-141.
[14] CETIN H,FENER M,GUNAYDIN O. Geotechnical Properties of Tire-cohesive Clayey Soil Mixtures as a Fill Material. Engineering Geology,2006,88(1/2):110-120.
[15] FATHALI M, NEJAD F M, ESMAEILI M. Influence of Tire-Derived Aggregates on the Properties of Railway Ballast Material. Journal of Materials in Civil Engineering, 2016,29(1): 04016177.
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