Influence of Rainfall Infiltration on Landfill Slope Stability
Abstract
In Malaysia, slope failure is often caused by intense and prolonged rainfall. Commonly, the groundwater table in the affected areas has increased, and the ground faces erosion and runoff. Some Malaysian terrains are steep and hilly, increasing the risk of landslides. This scenario can result in significant consequences including loss of life, property damage, and environmental degradation. This study investigates the effect of rainfall infiltration on landfill slope stability using the finite element method (FEM) of Plaxis2D modeling. The study adopted the Mohr-Coulomb parameters and analyzed two main conditions: with and without rainfall infiltration. The behavior of landfill slope stability is determined by the generated pore water pressure. The highest pore-water pressure was 260.84 kPa at the slope toe. In addition, the safety factors were calculated for slope angles of 1:3, 1:4, and 1:5, yielding values of 2.237, 2.553, and 2.907, respectively. The slope of 1:5 represents the highest safety factor. The results show that rainfall infiltration dramatically reduces the safety factor, underlining the destabilizing effect on landfill slopes. Furthermore, the varying slope height, which is believed to be a crucial factor, was also studied. At steeper slope ratios, the slope is prone to failure. These findings provide an important understanding of the long-term stability of landfill slopes that are generally located in areas with heavy rainfall. This discussion provides valuable information for developing better risk assessment and mitigation strategies.
Keywords: landfill, slope stability, rainfall, safety factor.
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ISMAIL S., TAIB A. M., RAHMAN N. A., HASBOLLAH D. Z. A. and RAMLI, A. B. Slope stability of landfill with waste degradation. International Journal of Innovative Technology and Exploring Engineering, 2019, 9(1): 393–398.
EKINCI E., & ARSLANKAYA E. Factors Affecting Stability and Slope Failure of Landfill Sites: A Review. EurAsia Waste Management Symposium, 24-26 October 2022: 342-353. İstanbul/Türkiye
FENG S. J., CHANG J. Y., SHI H., ZHENG Q. T., GUO X. Y., & ZHANG X. L. Failure of an unfilled landfill cell due to an adjacent steep slope and a high groundwater level: a case study. Engineering Geology, 2019, 262: 105320. https://doi.org/10.1016/j.enggeo.2019.105320
ISMAIL S., TAIB A. M., RAHMAN N. A., HASBOLLAH D. Z. A., & RAMLI A. B. Slope stability of landfill with waste degradation. International Journal of Innovative Technology and Exploring Engineering, 2019, 9(1): 393–398. https://doi.org/10.35940/ijitee. A4148.119119
KRISTO C., RAHARDJO H., and SATYANAGA A. Effect of variations in rainfall intensity on slope stability in Singapore. International Soil and Water Conservation Research, 2017, 5(4): 258–264.
MOHD TAIB A., TAHA M., & HASBOLLAH D. Validation of Numerical Modelling Techniques in Unsaturated Slope Behaviour. Jurnal Kejuruteraan, 2018, si1(5): 29-35. https://doi.org/10.17576/jkukm-2018-si1(5)-05
GHANI A. N. C., TAIB A. M., & HASBOLLAH D. Z. A. Effect of Rainfall Pattern on Slope Stability. In: DUC LONG, P., & DUNG, N. (Eds) Geotechnics for Sustainable Infrastructure Development. Lecture Notes in Civil Engineering, 2020, 62: 887-892. Springer, Singapore. https://doi.org/10.1007/978-981-15-2184-3_115
NAZRIEN NG J., MOHD TAIB A., RAZALI I. H., ABD RAHMAN N., WAN MOHTAR W. H. M., A. KARIM O., MAT DESA S., AWANG S., & MOHD M. S. F. The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour. Frontiers in Environmental Science, 2022, 10(March): 1–14. https://doi.org/10.3389/fenvs.2022.859427
RAZALI I. H., MOHD TAIB A., ABD RAHMAN N., ABANG HASBOLLAH D. Z., MD DAN M. F., RAMLI A. B., & IBRAHIM A. Slope stability analysis of riverbank in Malaysia with the effects of vegetation. Physics and Chemistry of the Earth, 2023, Parts A/B/C, 129: 103334. https://doi.org/10.1016/j.pce.2022.103334
HARABINOVÁ, S. & PANULINOVÁ, E. Impact of shear strength parameters on slope stability. MATEC Web of Conferences, 2020. 310: 00040.
YONG Z. J., CHEN W. N., SOH K. C., AHMED M. N., BASHIR M. J. K., & KASAVAN S. Municipal Solid Waste Management in Malaysia: Current Practices, Challenges, and Prospects. Economic Planning Unit, Malaysia, 2019.
JOHARI A., AHMED S. I., HASHIM H., ALKALI H. and RAMLI M. Economic and environmental benefits of landfill gas from municipal solid waste in Malaysia. Renewable and Sustainable Energy Reviews, 2012, 16(5): 2907–2912.
EPA. Landfill and soil capping: Remediation technologies. Federal Remediation Technologies Roundtable, 2018. https://www.frtr.gov/matrix/landfill-and-soil-capping
KAMARUDDIN M. A., YUSOFF M. S., RUI L. M., ISA, A. M., ZAWAWI M. H. & ALROZI R. An overview of municipal solid waste management and landfill leachate treatment: Malaysia and Asian perspectives. Environmental Science and Pollution Research, 2017, 24(35): 26988–27020
JAMIL N. A., & ABDUL RAHMAN A. Development trends in Melaka: The case of Sungai Udang township. Malaysian Journal of Geography, 2018, 60(1): 74-82.
MALAYSIAN METEOROLOGICAL DEPARTMENT. Jabatan Meteorologi Malaysia (MetMalaysia). Jabatan Meteorologi Malaysia 2, 2015, (November 2020): 1–16.
OMARI, A. Slope Stability Analysis of Industrial Solid Waste Landfills. Master’s Thesis, Luleå University of Technology, 2012.
LANDVA A, and CLARK J. Geotechnics of Waste Fill. In LANDVA, A, & KNOWLES, G. (Eds.) Geotechnics of Waste Fills—Theory and Practice. ASTM International, 1990. https://doi.org/10.1520/STP25301S
LI J., & LI X. Numerical modeling of pore-water pressure and slope stability in landfills under different slope angles. Computers and Geotechnics, 2021, 126: 103569.
https://doi.org/10.1016/j.compgeo.2020.103569
WANG M., & ZHOU X. The effect of pore-water pressure on the stability of landfill slopes: A finite element analysis. Journal of Geotechnical and Geoenvironmental Engineering, 2022, 148(6): 04022034.
https://doi.org/10.1061/(ASCE)GT.1943-5606.0002600
YANG Z., & LI P. The role of pore-water pressure in landfill slope stability under heavy rainfall conditions. Journal of Sustainable Waste Management, 2024, 10(2): 105-112.
https://doi.org/10.1016/j.sustwaste.2023.04.003
EYO E., & ABBEY S. Numerical modelling of rainfall influence on the susceptibility of a slope to sliding under induced compression. Applied Sciences, 2023, 13(23): 12692. https://doi.org/10.3390/app132312692
MD NOOR M. J., MUDA M. A., & ABDUL RAHMAN A. S. Rainfall induced slope failure detection using infiltration type slope stability method applying non-linear failure envelope. IOP Conference Series: Materials Science and Engineering, 2019, 513(1): 012013. http://doi.org/10.1088/1757-899X/513/1/012013
KHAN M. I., & WANG S. Slope stability analysis to correlate shear strength with slope angle and shear stress by considering saturated and unsaturated seismic conditions. Applied Sciences, 2021, 11(10): 4568. https://doi.org/10.3390/app11104568
HUANG F. M., XIONG H. W., YAO C., CATANI F., ZHOU C. B., & HUANG J. S. Uncertainties of landslide susceptibility prediction considering different landslide types. Journal of Rock Mechanics and Geotechnical Engineering, 2023, 15(11): 2954–2972. https://doi.org/10.1016/j.jrmge.2023.03.001
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