Electronic Theses and Dissertation

Banjir bandang yang terjadi di Kabupaten Pidie Jaya pada akhir November 2025 menyebabkan terbentuknya endapan material yang berpotensi dimanfaatkan sebagai material konstruksi. Penelitian ini bertujuan untuk mengidentifikasi karakteristik tanah berdasarkan sifat fisis serta menentukan kadar air optimum (Optimum Moisture Content/OMC) dan berat isi kering maksimum (Maximum Dry Density/MDD). Sampel tanah terganggu diambil dari enam titik pada tiga kecamatan di Kabupaten Pidie Jaya, yaitu Desa Beurawang dan Desa Manyang Cut di Kecamatan Meureudu, Desa Geunteng dan Desa Meunasah Bie di Kecamatan Meurah Dua, serta Desa Blang Dalam dan Desa Gampong Baro di Kecamatan Bandar Dua. Pengujian laboratorium meliputi berat jenis, batas Atterberg, analisis saringan, analisis hidrometer, serta uji pemadatan menggunakan metode Standard Proctor sesuai ASTM D698. Hasil penelitian menunjukkan bahwa berdasarkan sistem USCS, tanah di Desa Beurawang, Desa Manyang Cut, Desa Geunteng, Desa Blang Dalam, dan Desa Gampong Baro termasuk dalam kelompok ML, sedangkan tanah di Desa Geunteng termasuk dalam kelompok SM. Berdasarkan sistem AASHTO, tanah di Desa Beurawang, Desa Meunasah Bie, dan Desa Geunteng termasuk kelompok A-4, tanah di Desa Manyang Cut termasuk kelompok A-6, sedangkan tanah di Desa Blang Dalam dan Gampong Baro termasuk kelompok A-7-5. Nilai OMC yang diperoleh berkisar antara 15,69% hingga 24,75%, sedangkan nilai MDD berkisar antara 1,44 hingga 1,64 gr/cm³. Desa Geunteng memiliki nilai MDD tertinggi sebesar 1,64 gr/cm³ dengan OMC terendah sebesar 15,69%, sedangkan Desa Gampong Baro memiliki nilai MDD terendah sebesar 1,44 gr/cm³ dengan OMC tertinggi sebesar 24,75%. Perbedaan nilai tersebut menunjukkan bahwa karakteristik setiap endapan dipengaruhi oleh distribusi ukuran butir dan tingkat plastisitas, sehingga menghasilkan perilaku pemadatan yang berbeda. Hasil penelitian ini diharapkan dapat menjadi informasi teknis dalam pemanfaatan material endapan banjir sebagai alternatif bahan timbunan maupun lapisan dasar pada pekerjaan konstruksi.
Kata Kunci : Tanah Endapan Banjir, Sifat Fisis Tanah, Klasifikasi Tanah, OMC, MDD

Flash floods in Pidie Jaya Regency in late November 2025 resulted in material deposits that could potentially be utilized for construction purposes. This study aimed to identify soil characteristics based on physical properties and to determine the Optimum Moisture Content (OMC) and Maximum Dry Density (MDD). Disturbed soil samples were collected from six locations across three districts in Pidie Jaya Regency: Beurawang Village and Manyang Cut Village in Meureudu District; Geunteng Village and Meunasah Bie Village in Meurah Dua District; and Blang Dalam Village and Gampong Baro Village in Bandar Dua District. Laboratory testing included specific gravity, Atterberg limits, sieve analysis, hydrometer analysis, and compaction testing using the Standard Proctor method in accordance with ASTM D698. The results indicate that, under the USCS classification system, the soil from Beurawang, Manyang Cut, Geunteng, Blang Dalam, and Gampong Baro villages falls into the ML group, while the soil from Geunteng Village falls into the SM group. Under the AASHTO system, the soil from Beurawang, Meunasah Bie, and Geunteng villages falls into the A-4 group; the soil from Manyang Cut Village falls into the A-6 group; and the soil from Blang Dalam and Gampong Baro villages falls into the A-7-5 group. The obtained OMC values ​​ranged from 15.69% to 24.75%, while MDD values ​​ranged from 1.44 to 1.64 g/cm³. Geunteng Village exhibited the highest MDD (1.64 g/cm³) and the lowest OMC (15.69%), whereas Gampong Baro Village exhibited the lowest MDD (1.44 g/cm³) and the highest OMC (24.75%). These variations indicate that the characteristics of each deposit are influenced by grain-size distribution and plasticity levels, resulting in distinct compaction behaviors. The results of this study are expected to provide technical information regarding the utilization of flood deposit materials as an alternative for fill material or base layers in construction projects. Keywords: Flood deposit soil, soil physical properties, soil classification, OMC, MDD.