|
|
基于细观力学的TDA混合土抗剪特性研究
|
Abstract:
为提高废旧轮胎利用率，可将其加工成不规则形状的破碎料，并与土体混合而成TDA混合土，具有减轻土体自重、提高土体抗剪强度等特性，近年来被尝试用作桥台、挡土墙等结构物的台背回填材料。为揭示TDA混合土剪切特性与细观机理，首先基于自制大尺寸直剪仪测定混合土抗剪强度，并据此建立了DEM计算模型，开展了TDA混合土受剪过程中的细观力学分析。结果表明，TDA掺入比为0~15%范围内，抗剪强度随掺入比的增加而增加，其力学机理主要表现为不规则轮胎颗粒可有效调动土颗粒的抗剪能力，形成斜向贯穿的强力链连接的剪切带区域，颗粒间的总接触力、法向接触力均明显增大，接触力角度集中于斜向45？附近区域，验证了TDA掺入对混合材料剪切强度的提高作用。
In order to improve the utilization rate of waste tires, they could be processed into irregularly shaped crushed materials and mixed with soil to make TDA mixed soil, which had the characteristics of reducing the self-weight of the soil and improving the shear strength of the soil, and had been tried to be used as backfill material for bridge abutments, retaining walls and other structures in recent years. In order to reveal the shear characteristics and fine-scale mechanism of TDA mixed soil, firstly, the shear strength of mixed soil was measured based on a homemade large-size direct shear instrument, and a DEM calculation model was established accordingly to carry out the fine-scale mechanical analysis of TDA mixed soil in the process of shear. The results showed that the shear strength increased with the increase of TDA incorporation ratio in the range of 0~15%, and the mechanical mechanism mainly showed that irregular tire particles could effectively mobilize the shear capacity of soil particles and form a shear zone region connected by strong chains running diagonally. The total contact force and normal contact force between the particles were significantly increased, and the contact force angle was concentrated in the area near 45？ in the oblique direction, which verified the improvement effect of TDA incorporation on the shear strength of the mixed material.
| [1] | Mucsi, G., Szenczi, Á. and Nagy, S. (2018) Fiber Reinforced Geopolymer from Synergetic Utilization of Fly Ash and Waste Tire. Journal of Cleaner Production, 178, 429-440. https://doi.org/10.1016/j.jclepro.2018.01.018 |
| [2] | Yadav, J.S. and Tiwari, S.K. (2017) The Impact of End-of-Life Tires on the Mechanical Properties of Fine-Grained Soil: A Review. Environment, Development and Sustainability, 21, 485-568. https://doi.org/10.1007/s10668-017-0054-2 |
| [3] | Gao, N., Wang, F., Quan, C., Santamaria, L., Lopez, G. and Williams, P.T. (2022) Tire Pyrolysis Char: Processes, Properties, Upgrading and Applications. Progress in Energy and Combustion Science, 93, Article 101022. https://doi.org/10.1016/j.pecs.2022.101022 |
| [4] | ASTM (2020) Standard Practice for Use of Scrap Tires in Civil Engineering Applications. ASTM Standard D6270-20. ASTM International. |
| [5] | Tajabadipour, M., Dehghani, M., Kalantari, B. and Lajevardi, S.H. (2019) Laboratory Pullout Investigation for Evaluate Feasibility Use of Scrap Tire as Reinforcement Element in Mechanically Stabilized Earth Walls. Journal of Cleaner Production, 237, Article 117726. https://doi.org/10.1016/j.jclepro.2019.117726 |
| [6] | Li, L.H., Yang, J.C., Hu, Z., Xiao, H.L. and Liu, Y.L. (2019) The Properties of Reinforced Retaining Wall Under Cyclic Loading. 8th International Congress on Environmental Geotechnics (ICEG), 28 October-1 November 2018, Hangzhou, 172-180. |
| [7] | Li, L., Yang, J., Xiao, H., Zhang, L., Hu, Z. and Liu, Y. (2020) Behavior of Tire-Geogrid-Reinforced Retaining Wall System under Dynamic Vehicle Load. International Journal of Geomechanics, 20, Article 04020017. https://doi.org/10.1061/(asce)gm.1943-5622.0001566 |
| [8] | Deng, A. and Feng, J. (2010) Experimental Study on Sand Shredded Tire Lightweight Fills. Journal of Building Materials, 13, 116-120. |
| [9] | Hataf, N. and Rahimi, M.M. (2006) Experimental Investigation of Bearing Capacity of Sand Reinforced with Randomly Distributed Tire Shreds. Construction and Building Materials, 20, 910-916. https://doi.org/10.1016/j.conbuildmat.2005.06.019 |
| [10] | Zornberg, J.G., Cabral, A.R. and Viratjandr, C. (2004) Behaviour of Tire Shred-Sand Mixtures. Canadian Geotechnical Journal, 41, 227-241. https://doi.org/10.1139/t03-086 |
| [11] | Rao, G.V. and Dutta, R.K. (2006) Compressibility and Strength Behaviour of Sand-Tyre Chip Mixtures. Geotechnical and Geological Engineering, 24, 711-724. https://doi.org/10.1007/s10706-004-4006-x |
| [12] | Foose, G.J., Benson, C.H. and Bosscher, P.J. (1996) Sand Reinforced with Shredded Waste Tires. Journal of Geotechnical Engineering, 122, 760-767. https://doi.org/10.1061/(asce)0733-9410(1996)122:9(760) |
| [13] | 李丽华, 肖衡林, 唐辉明, 等. 轮胎碎片-砂混合土抗剪性能优化试验研究[J]. 岩土力学, 2013, 34(4): 1063-1067. |
| [14] | 刘毅. 废旧轮胎碎片加筋路基力学特性试验研究[D]: [硕士学位论文]. 武汉: 湖北工业大学, 2015. |
| [15] | Zhang, H., Wang, H., Li, Y., Yuan, X., Sun, J., Song, X., et al. (2022) An Investigation of the Pullout Behaviors of Tire Strips Embedded in Tire-Derived Aggregate Reinforced Sand. Environmental Science and Pollution Research, 29, 35599-35614. https://doi.org/10.1007/s11356-021-16313-z |
| [16] | 张磊, 肖溟, 王磊, 等. 废旧轮胎片体-风化料混合物压实特性的试验研究[J]. 山东大学学报(工学版), 2018, 48(5): 118-123. |
| [17] | Tatlisoz, N., Edil, T.B. and Benson, C.H. (1998) Interaction between Reinforcing Geosynthetics and Soil-Tire Chip Mixtures. Journal of Geotechnical and Geoenvironmental Engineering, 124, 1109-1119. https://doi.org/10.1061/(asce)1090-0241(1998)124:11(1109) |
| [18] | 任明辉, 赵光思, 浦海, 等. 无黏性松散土石混合体剪切特性的结构效应及强度模型构建[J]. 岩石力学与工程学报, 2024, 43(7): 1707-1721. |
| [19] | 中华人民共和国交通部. JTG 3430-2020公路土工试验规程[S]. 北京: 标准出版社, 2020. |
| [20] | Cundall, Peter A. (1971) A Computer Model for Simulating Progressive, Large-Scale Movement in Blocky Rock System. Proceedings of the International Symposium on Rock Mechanics, France, 4-6 October 1971, II-8. |
| [21] | 孟凡净, 刘焜, 王伟. 剪切平行板间密集颗粒流的接触力分布及各向异性分析[J]. 应用数学和力学, 2013, 34(7): 714-723. |
