Warta Geologi, Vol. 52, No. 2, August 2026, pp. 64-75
Sifat penyerakan tanah aluvium di Shah Alam, Selangor (Dispersive behavior of alluvial soil in Shah Alam, Selangor)
Zulaikha Nabila Ahmad Pua’ad1, Nor Shahidah Mohd Nazer1,*, Nabilah Nurina1, Anis Syazwani Jamsus1, Azlan Shah Nerwan Shah1,2
1Jabatan Sains Bumi dan Alam Sekitar, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
2Bahagian Teknologi Industri, Agensi Nuklear Malaysia, 43000 Kajang, Selangor, Malaysia
*Corresponding author email address: shahidahnazer@ukm.edu.my
Abstrak: Tanah terserak merupakan tanah yang berisiko terhadap hakisan apabila butiran tanah bertindak balas dengan air. Tindak balas pengasingan tanah berlaku apabila kehadiran jumlah ion natrium yang tinggi akibat penjerapan di permukaan lempung menolak di antara satu sama lain menyebabkan deflokulasi butiran. Penentuan sifat serakan tanah alluvium dijalankan melalui 3 jenis ujian penyerakan iaitu ujian Crumb, ujian hidrometer berganda dan ujian serakan lubang pin. Berdasarkan keputusan yang diperolehi, tanah alluvium dikategorikan sebagai terserak tinggi oleh ujian Crumb, manakala untuk ujian hidrometer berganda dan ujian serakan lubang pin kedua-duanya menunjukkan pada tahap sederhana terserak. Keadaan ini didorong oleh sifat tanah alluvium dengan kehadiran koloid lempung yang tinggi dan menyebabkan proses penembusan air terhadap keseluruhan butiran tanah menjadi perlahan. Dapatan ini penting dalam menafsir sifat semulajadi tanah ini terutama melibatkan permasalahan seperti kegagalan empangan, kestabilan cerun dan pendasaran bangunan.
Kata kunci: Tanah terserak, tanah aluvium, ujian Crumb, ujian hidrometer berganda, ujian lubang pin
Abstract: Dispersive soils are prone to erosion when soil particles react with water. The dispersion process occurs when a high amount of sodium ions adsorbed onto clay surfaces causes repulsion between particles, leading to deflocculation. The dispersive characteristics of alluvial soil were determined using three types of dispersion tests, namely the Crumb test, the double hydrometer test, and the pinhole dispersion test. Based on the results obtained, the alluvial soil was classified as highly dispersive by the Crumb test, while both the double hydrometer and pinhole tests indicated a moderately dispersive level. This condition is influenced by the nature of alluvial soils, which contain a high amount of clay colloids, resulting in slower water penetration throughout the soil particles. These findings are important for understanding the natural behaviour of this soil, particularly in relation to issues such as dam failure, slope stability, and building foundations.
Keywords: Dispersive soil, alluvial soil, Crumb test, double hydrometer test, pinhole test
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Manuscript received 5 August 2025;
Received in revised form 20 October 2025;
Accepted 1 April 2026
Available online 30 August 2026
DOI: https://doi.org/10.7186/wg522202602
0126-5539; 2682-7549 / Published by the Geological Society of Malaysia.
© 2026 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0
