Analisis Kegagalan Dinding Turap Tipe CCSP Proyek Revetment Sungai Bengawan Solo. Studi Kasus Desa Lebaksari, Kecamatan Baureno, Bojongoro
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Sungai Bengawan Solo sebagai sungai terpanjang di Pulau Jawa memiliki morfologi yang dinamis, terutama pada daerah tikungan di Desa Lebaksari, Bojonegoro, dimana gerusan tebing sungai terus menggerus lahan pertanian warga. Untuk mengatasi hal tersebut, dibangun struktur revetment menggunakan turap CCSP sepanjang 980 meter. Namun, hanya dalam satu bulan pasca-konstruksi (Desember 2024), turap mengalami keruntuhan. Penelitian ini bertujuan untuk menganalisis penyebab kegagalan turap. Pada kondisi muka air sungai surut dan kondisi tanah yang sudah tergerus, turap pada segmen 2 dan 3 mengalami keruntuhan. Berdasarkan hasil perhitungan, panjang total turap pada segmen 2 dan 3 melebihi panjang total turap eksisting. Momen maksimum yang terjadi pada segmen 2 dan 3 juga melebihi momen crack turap eksisting. Gaya angkur yang terjadi melebihi beban izin tiang, sehingga tiang pancang tercabut. Hal ini yang menyebabkan turap tidak stabil dan mengalami kegagalan. Kedalaman gerusan ditinjau berdasarkan cross-section sungai. Berdasarkan hasil perhitungan gerusan pada kaki turap menggunakan metode Hire Equation untuk debit banjir Q50 dan Q25, dapat disimpulkan bahwa kedalaman gerusan (ys) sangat dipengaruhi oleh besarnya debit banjir dan elevasi muka air sungai.
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