KUAT GESER CLAY SHALE AKIBAT VARIASI KADAR AIR
DOI:
https://doi.org/10.31961/gradasi.v8i1.1402Keywords:
Clay Shale, Kuat Geser, Kadar AirAbstract
Sebagian besar jenis tanah di Kota Batulicin Provinsi Kalimantan Selatan adalah clay shale yang berada di permukaan tanah sampai kedalaman tertentu. Pada lapisan tanah terbuka Clay shale memiliki potensi negatif sebagai perisai alami yang menghalangi pergerakan air sehingga menyebabkan permasalahan drainase dan banjir. Selain itu clay shale dapat menyebabkan pergerakan tanah yang tidak stabil ketika mengalami perubahan volumetrik akibat perubahan tekanan, kelembaban atau kadar air sehingga terjadi penurunan kuat geser. Dalam rangka mengetahui nilai kuat geser tersebut telah dilakukan pengujian sifat fisis dan mekanis di laboratorium akibat perubahan kadar air. Pengujian tersebut dilakukan dengan membuat 4 (empat) sampel rekonstruktif lolos saringan No 4 dengan kadar air alami (Wn) untuk undisturbed sample (UDS) dan 2Wn, 3Wn dan kadar air pada batas cair (WLL) untuk sampel rekonstruktif yang diuji dengan pengujian geser langsung dan kuat tekan bebas. Hasil penelitian menunjukan bahwa peningkatan kadar air dari kadar air alami (Wn) akan menurunkan nilai berat volume, sudut geser dalam, kuat geser undrained dan kohesi undrained. Sementara peningkatan kadar air sampai 3Wn akan meningkatkan nilai kohesi dan akan mengalami penurunan jika peningkatan kadar air lebih besar dari 3Wn.
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