KARAKTERISTIK SIFAT MEKANIS TANAH LEMPUNG TERHADAP KADAR AIR (KAMPUS UNAND LIMAU MANIS PADANG)
Keywords:
Kadar Air, Kohesi, TanahAbstract
Kampus Universitas Andalas dan Politeknik Negeri Padang terletak di lereng bukit, tanah dasarnya didominasi
oleh lapisan lempung yang rentan terhadap perobahan kadar air. Kekuatan geser tanah ini sangat dipengaruhi
oleh kandungan air yang ada dalam tanah tersebut.
Penelitian ini dilakukan untuk mendapatkan pengaruh kadar air terhadap kekuatan geser tanah, yaitu dengan
cara penambahan air secara bertahap (bervariasi), mulai dari kadar air dibawah Liquid Limit dan diatas kadar air
Liquid Limit. Dan dilanjutkan dengan pengujian kuat geser masing masing variasi.Pengujian dilakukan
dilakukan dengan variasi kadar air mulai dari 40% , 50%, 55%, 60% dan 70% .
Hasil analisa memperlihatkan bahwa jenis tanah di kampus Unand-Politeknik termasuk jenis MH-OH
(klasifikasi USCS) yaitu tanah lempung-lanau dengan plastisitas tinggi.
Nilai kohesi tanah lempung-berlanau (MH-OH) sangat dipengaruhi oleh kadar air, jika kadar air > 40%, nilai
para kuat geser (kohesi) tanah secara siknifikan menurun drastis. Sedangkan penurunan nilai kuat geser tanah
dari kondisi asli sampai mencapai ± 75% . Hal ini menunjukkan bahwa kekuatan geser tanah lempung sangat
rentan terhadap perobahan kadar air.
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