The Liquefaction Behavior of Leachate-Contaminated of Sand under Cyclic Loads

Abstract

Uncontrolled solid waste affects the stress-strain behavior of the soil as well as an environmental problem. In this research, the effect of leachate on the dynamic behavior of sand has been studied and the results were compared with clean sand at different saturation degrees. The modified split molds at 50mm diameter and 100 mm height were used to prepare the polluted soil. Both polluted and clean sand samples were prepared by dry pluviation method. After preparation, the samples in the modified mold were put in the wastewater to keep for different cure times. Then samples were installed on the dynamic triaxial test system at 0.1 Hz and ±σdev/2σ'c =0.28-0.30 cyclic ratio. For saturation, not to change the structure of polluted sand, CO2 and distilled water were not used under the vacuum. Stress control cyclic tests were conducted on both clean and polluted sand consolidated at 100 kPa isotropically. The measured B values varied between 45-93%. Test results show as the B value decreases the number of cycles causing liquefaction increases in both the clean and polluted sand. Leachate makes the sand more liquefiable depending on cure time at the same saturation value.

Keywords

• Leachate
• Critical Deformation Level
• Polluted Sand
• Dynamic Behavior
• Curing Time

Kaynakça

1. Turkish Statistical Instıtute. (2023). Municipal Solid-waste Statistics Report (Report No: 49570). Ankara -Turkiye, 14 Kasım 2023.
2. Tuncan M., Khan L., and Pamukçu S. (1988) The effect of leachate on geotechnical properties of clay liner. Hazardous and industrial Waste-Proceedings of the Twentieth mid-Atlantic Industrial waste Conference,133-144.
3. A.J. Roque, and G. Didier, “Calculating Hydraulic Conductivity of Fine Grained Soils to Leachates Using Linear Expression,” Engineering Geology, 85(2006):147-157
4. Nayak S., Sunil B.M., and Shrihari S. (2007) Hydraulic and compaction characteristics of leachate-contaminated lateric soil. Engineering Geology, 94,137-144.
5. H. Brandl, “Mineral Liners for Hazardous Waste Containment,” Geotechnique, 1992 42(1):57-65.
6. Naeini S, Shojaedin M (2014) Effect of oil contamination on the liquefaction behavior of sandy soils. Int J Environ Chem Ecol Geol Geophys Eng 8:289–292. https://doi.org/10.5281/zenodo.2660830.
7. Rajabi H, Sharifpour M (2017) An experimental characterization of shear wave velocity (V s) in clean and hydrocarboncontaminated sand. Geotech Geol Eng 35(6):2727–2745. https://doi.org/10. 1007/s10706-017-0274-0.
8. Hosseini, A., & Hajiani Boushehrian, A. (2019). Laboratory and numerical study of the behavior of circular footing resting on sandy soils contaminated with oil under cyclic loading. Scientia Iranica, 26(6), 3219-3232. doi: 10.24200/sci.2018.5427.1267

9. Masoud Nasiri, Mohammad Hajiazizi, Pornkasem Jongpradist & Ahmad R. Mazaheri (2024) Time-Dependent Behavior of Crude Oil-Contaminated Sands Under Static and Dynamic States, Soil and Sediment Contamination: An International Journal, 33:3, 353-374, DOI: 10.1080/15320383.2023.2204981.
10. G. Tchobanoglous, H. Theisen, S.A. Vigil, “Integrated Solid Waste Management – Engineering Principles and Management Issues,” 1993, Chapter 11-5, p.417-419.
11. Japanese Geotechnical Society Standard. “Preparation of soil specimens for triaxial tests”. Tokyo, Japan, JGS 0520-2020, 2015.
12. Z. Kaya, A. Erken, “Cyclic and post-cyclic monotonic behavior of Adapazari soils,” Soil Dynamics and Earthquake Engineering Volume 77, 2015, Pages 83-96.
13. Z. Kaya, A. Erken, H. Cilsalar, “Characterization of Elastic and Shear Moduli of Adapazari Soils by Dynamic Triaxial Tests and Soil-Structure Interaction with Site Properties,” Soil Dynamics and Earthquake Engineering Volume 151, 2021, 106966.
14. Kamata, T., Tsukamoto, Y., & Ishihara, K. (2009). Undrained shear strength of partially saturated sand in triaxial tests. Bulletin of the New Zealand Society for Earthquake Engineering, 42(1), 57–62. https://doi.org/10.5459/bnzsee.42.1.57-62.
15. Zhang, Bo & Muraleetharan, Kanthasamy & Liu, Chunyang. (2016). Liquefaction of Unsaturated Sands. International Journal of Geomechanics. 16. D4015002. 10.1061/(ASCE)GM.1943-5622.0000605.
16. Arab, A., Belkhatir, M. & Sadek, M. Saturation Effect on Behaviour of Sandy Soil Under Monotonic and Cyclic Loading: A Laboratory Investigation. Geotech Geol Eng 34, 347–358 (2016). https://doi.org/10.1007/s10706-015-9949-6.
17. Chakrabortty, P., Roshan, A.R. & Das, A. Evaluation of Dynamic Properties of Partially Saturated Sands Using Cyclic Triaxial Tests. Indian Geotech J 50, 948–962 (2020). https://doi.org/10.1007/s40098-020-00433-3.