Physical, geochemical, and clay mineralogical properties of unstable soil slopes in the Cameron Highlands

Olaniyan, Abdulrasheed and Abu Bakar, Ahmad Farid and Yusoff, Ismail and Abd Ghani, Azman and Qaysi, Saleh and Kahal, Ali and Alfaifi, Hussain and Alzahrani, Hassan (2021) Physical, geochemical, and clay mineralogical properties of unstable soil slopes in the Cameron Highlands. Open Geosciences, 13 (1). pp. 880-894. ISSN 2391-5447, DOI

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The physical, geochemical, and clay mineralogical properties are location dependent and influence landslide, yet this relationship is understudied in the Cameron Highlands. Therefore, this study demonstrates the effect of the selected physical-geochemical properties and clay mineralogy on landslide susceptibility (LS) in the Cameron Highlands, Malaysia. Seven soil samples were taken from non-landslide-affected slopes (NAS) and 13 from landslide-affected slopes (LAS), making a total of 20 samples that were analyzed. The degree of the LAS and NAS ranges from 42-80 degrees and 30-70 degrees, respectively. The NAS soils were characterized by lower sand, higher clay, higher organic matter content (OMC), and higher cation exchange capacity (CEC). Soils with high sand tend to have larger free pores and weak bonds, making them more vulnerable to landslides. The electrostatic charges on the clay's surface bind the solution ions, increasing cohesion between soil particles. Also, high CEC in soils improves their stability through the binding effect resulting from the attraction between solution ions via the electrostatic surface charges of the clay in the soil. The clay mineralogy revealed the abundance of kaolinite and illite, indicating the last stage of weathering associated with the weathering of primary minerals forming the bedrock. In this study, it was demonstrated that high sand, low clay, low OMC, low CEC, and clay mineralogy of the soil were associated with slope failure in the study area.

Item Type: Article
Funders: Institute of Research Management and Services, University of Malaya [Grant No: PG281-2016A], King Saud University, Deanship of Scientific Research, King Saud University
Uncontrolled Keywords: Landslides; Soil slope; Slope failure; Physical-geochemical; Susceptibility; Cameron Highlands; Malaysia
Subjects: Q Science > QE Geology
Divisions: Faculty of Science > Department of Geology
Depositing User: Ms Zaharah Ramly
Date Deposited: 27 Jun 2022 01:32
Last Modified: 27 Jun 2022 01:32

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