PERANCANGAN TURAP BERJANGKAR PADA TEPIAN SUNGAI MAHAKAM DI JALAN KH. MAS MANSYUR LOA BAKUNG SAMARINDA

Kukuh Prihatin, Priyo Suroso, Nurul Lailis Sa’adah

Abstract


Pekerjaan pembangunan turap merupakan salah satu kegiatan untuk menangani kelongsoran yang terjadi pada ruas Jl. KH. Mas Mansyur Loa Bakung Samarinda.Tipe longsoran yang terjadi yaitu translasi dan rotasi karena dipengaruhi oleh medan jalan yang  sedikit menanjak dan berada di pinggiran Sungai Mahakam. Longsoran tersebut mengakibatkan terjadinya penurunan badan jalankarenagerusan air di bawahnyadan beban lalu lintas yang melebihi kelas jalan. Sheet pile yang digunakan yaitu sheet pile baja dengan metode turap berjangkar ujung bebas, dimana kondisi tanah yang bekerja menggunakan teori Rankine. Dari hasil pengujian  sondir dan boring diketahui kedalaman tanah keras 11 m dan jenis tanahnya yaitu tanah kohesif (lempung). Dari hasil perhitungan diperoleh panjang turap 8 m dengan penanamanjangkar diambil 1 m di bawah permukaan tanah. Jangkar yang digunakan jangkar baja (tie rod) Ø1,15” dengan tiang pancang baja diameter 35,56 cm dipasang tiap jarak 1,6 m. Untuk dimensi gording H-Beam 200.200.8.12 mm dan stabilitas lereng menggunakan program XSTABLE (metode Bishop) diperoleh angka aman 1,536. Biaya yang diperlukan sebesar Rp. 4.292.224.000(berdasarkan harga tahun 2014).


Keywords


Turap berjangkar, turap baja, tanah kohesif, stabilitas turap, XSTABLE

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DOI: https://doi.org/10.46964/inersia.v9i1.499

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