Analisis Stabilitas Lereng Dan Alternatif Dinding Penahan Tanah Pada Jalan Gondang-Lengkong Kec. Gondang Kab. Nganjuk. (Slope Stability Analysis and Alternative Retaining Wall Solutions on the Gondang-Lengkong Road, Gondang District, Nganjuk Regency).

Rofiq, Moch Bayu Aji Ainur (2024) Analisis Stabilitas Lereng Dan Alternatif Dinding Penahan Tanah Pada Jalan Gondang-Lengkong Kec. Gondang Kab. Nganjuk. (Slope Stability Analysis and Alternative Retaining Wall Solutions on the Gondang-Lengkong Road, Gondang District, Nganjuk Regency). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

Penelitian ini bertujuan untuk menganalisis stabilitas lereng dan alternatif dinding penahan tanah pada jalan Gondang-Lengkong, Kecamatan Gondang, Kabupaten Nganjuk, yang mengalami longsor dan kerusakan pada sheet pile eksisting. Dalam penelitian ini, dilakukan analisis terhadap kondisi stabilitas sheet W325 tipe A eksisting dengan hasil faktor keamanan pada kondisi normal sebesar 0,475 dan pada kondisi gempa sebesar 0,347, yang keduanya tidak memenuhi standar keamanan (kurang dari 1,5). Sebagai alternatif, digunakan sheet pile W600 tipe B dengan faktor keamanan yang lebih baik, yaitu 1,67 pada kondisi normal dan 1,54 pada kondisi gempa, yang keduanya memenuhi standar (lebih dari 1,5).Selain itu, dilakukan perhitungan dimensi dinding penahan tanah kantilever dengan tinggi total 4 m, tinggi dinding 3,6 m, tebal dinding 0,30 m, lebar pondasi 2,80 m, dan tebal pondasi 0,40 m. Berdasarkan analisis, diperoleh faktor keamanan dinding penahan tanah kantilever sesuai dengan SNI 8460:2017, yang menunjukkan hasil yang memenuhi standar keamanan, yaitu SF guling 2,08 (normal) dan 1,138 (gempa), SF geser 1,817 (normal) dan 1,164 (gempa), serta SF daya dukung tanah 4,5 (normal) dan 2,902 (gempa). Dimensi penulangan dinding menggunakan besi ulir D16 dan D13.Dalam hal anggaran biaya, hasil perhitungan menunjukkan bahwa biaya untuk penggantian sheet pile beton W600 tipe B adalah Rp 499.126.664,- sedangkan biaya untuk pembangunan dinding penahan tanah tipe kantilever adalah Rp 301.936.309,-. Berdasarkan hasil analisis tersebut, dapat disimpulkan bahwa alternatif penggunaan sheet pile W600 tipe B dan dinding penahan tanah kantilever dapat menjadi solusi yang lebih aman dan ekonomis untuk memperbaiki kerusakan yang terjadi pada jalan tersebut.

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