Investigating the Effect of Particle Size, Granulation and Concrete Block on the Behavior and Shear Strength of Granular Soils, with Emphasis on the Shear Zone
Document Type : Original Article
Authors
1 Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
2 M.Sc., Grad., Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
3 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
Abstract
The particle size of granular soils have a great effect on their shear behavior. The purpose of this article is to investigate the shear behavior of granular soils with different particle sizes. The large-scale direct shear tests are conducted in three parts. The first part of the experiments is related to 4 types of granular soil with different particle size. The second part is related to the tests performed on composite samples and in the third part, the effect of a concrete block on the shear strength of granular soil is investigated. According to the results, as the particle size of the material increases, the push of the shear failure increases and the sample has a higher shear strength, in the same way, as the size of the particles increases, the friction angle of the materials and the dilation angle increases. The main finding of this article is that the materials located in the shear zone have a great impact on the strength of the sample. In composite samples, if the sand is compacted in the shear zone, although the top and bottom of the sample is gravel, the behavior and strength of the sample is close to that of pure sand. The thickness of the shear zone is dependent on the size of the particles, the thickness of the shear zone increases as the grain size increases. The concrete block in the shear zone increases the shear strength and internal friction angle of the sand sample.
Keywords
-Alshameri, B., Bakar, I., Madun, A., Abdeldjouad, L., & Dahlan, S. H. (2016). Effect of Coarse Materials Percentage in the Shear Strength. IOP Conference Series: Materials Science and Engineering, 136(1), 012017.doi:10.1088/1757-899X/136/1/012017
-Altuhafi Fatin, N., Coop Matthew, R., & Georgiannou Vasiliki, N. (2016). Effect of Particle Shape on the Mechanical Behavior of Natural Sands. Journal of Geotechnical and Geoenvironmental Engineering, 142(12), 04016071. doi:10.1061/(ASCE)GT.1943-5606.0001569
-ASTM-D3080 (1998). Standard Test Method for Direct Shear Test of Soils under Consolidated Drained Conditions.
-Chen, J.-N., Ren, X., Xu, H., Zhang, C., & Xia, L. (2022). Effects of Grain Size and Moisture Content on the Strength of Geogrid-Reinforced Sand in Direct Shear Mode. International Journal of Geomechanics, 22(4), 04022006.
doi:10.1061/(ASCE)GM.1943-5622.0002309
-El Naggar, H., Zahran, K., & Moussa, A. (2021). Effect of the Particle Size on the TDA Shear Strength and Stiffness Parameters in Large-Scale Direct Shear Tests. Geotechnics, 1(1), 1-17. doi.org/10.3390/geotechnics1010001
-Fakhimi, A., & Hosseinpour, H. (2008). The role of oversize particles on the shear strength and deformational behavior of rock pile material. The 42nd US Rock Mechanics Symposium (USRMS), American Rock Mechanics Association, 2008.
-Gu, R., Fang, Y., Jiang, Q., Li, B., & Feng, D. (2022). Effect of particle size on direct shear deformation of soil. Geomechanics and Engineering , 28 (2), 135–143. doi.org/10.12989/GAE.2022.28.2.135
-Guth, E. (2004). Theory of Filler Reinforcement. Journal of Applied Physics, 16(1), 20-25.doi.org/10.1063/1.1707495
-Hasanzadehshooiili, H., Mahinroosta, R., Lakirouhani, A., & Oshtaghi, V. (2014). Using artificial neural network (ANN) in prediction of collapse settlements of sandy gravels. Arabian Journal of Geosciences, 7(6),
2303-2314.doi.org/10.1007/s12517-013-0858-9
2303-2314.doi.org/10.1007/s12517-013-0858-9
-Lakirouhani, A., Bahrehdar, M., & Hosseini, S. M. (2018). Investigation About Shear Behavior Of Sand Reinforced With Geotextile With Emphasis On Shear Zone. Sharif Journal of Civil Engineering, 34.2(2.1), 99-108. doi.org/10.24200/j30.2018.1345
-Lakirouhani, A., & Abbasian, M. (2018). Investigation of Soil-Geogrid Interface in Direct Shear test, with Emphasis on the size of Apertures of Geogrid and Different Compaction Degrees of Soil. Amirkabir Journal of Civil Engineering, 50(5), 949-960. doi.org/10.22060/ceej.2017.12726.5258
-Sarkar, D., Goudarzy, M., König, D., & Wichtmann, T. (2020). Influence of particle shape and size on the threshold fines content and the limit index void ratios of sands containing non-plastic fines. Soils and Foundations, 60(3), 621-633.
-Sitharam, T. G., & Nimbkar, M. S. (2000). Micromechanical Modelling of Granular Materials: Effect of Particle Size and Gradation. Geotechnical & Geological Engineering, 18(2), 91-117. doi.org/10.1023/A:1008982027109
-Tian, J., Liu, E., Jiang, L., Jiang, X., Sun, Y., & Xu, R. (2018). Influence of particle shape on the microstructure evolution and the mechanical properties of granular materials. Comptes Rendus Mécanique, 346(6), 460-476. doi.org/10.1016/j.crme.2018.03.006
-Tiwari, B., Ye, G., Li, M., Khalid, U., & Yadav, S. K. (2020). Strength and dilatancy behaviors of deep sands in Shanghai with a focus on grain size and shape effect. Journal of Rock Mechanics and Geotechnical Engineering, 12(6), 1214-1225.
-Wang, S., Lei, X.-W., Meng, Q.-S., Xu, J.-L., Xie, L.-F., & Li, Y.-J. (2020). Influence of Particle Shape on the Density and Compressive Performance of Calcareous Sand. KSCE Journal of Civil Engineering, 24(1),
49-62.doi.org/10.1007/s12205-020-0145-8
49-62.doi.org/10.1007/s12205-020-0145-8
-Wang, Y., Shao, S., & Wang, Z. (2019). Effect of Particle Breakage and Shape on the Mechanical Behaviors of Granular Materials. Advances in Civil Engineering, 2019, 7248427.doi.org/10.1155/2019/7248427