DETAIL ENGINEERING DESIGN (DED) DINDING PENAHAN TANAH RUAS JALAN LAHA – NEGERI LIMA KABUPATEN MALUKU TENGAH

Abstrak

Ruas Jalan Laha – Negeri Lima adalah jalan lintas yang menghubungkan Kabupaten Maluku Tengah dan Kota Ambon yang dibangun pada tahun 2012 dengan panjang 17 km dan lebar 4,5 m. Berdasarkan   kondisi geografis, Ruas Jalan Laha – Negeri lima terdapat sebagian besar bukit dan lereng sehingga saat kondisi curah hujan tinggi dapat mengakibatkan longsoran dinding lereng. Longsoran yang terjadi mencapai daerah perkerasan jalan dengan panjang longsoran 7,4 m. Longsoran ini mengakibatkan penyempitan badan jalan sehingga sangat menganggu aktivitas pengguna jalan. Tujuan dari penelitian ini yaitu untuk menghasilkan jenis dinding penahan tanah yang cocok untuk digunakan dan menghasilkan detail engineering designnya. Dalam perhitungan tekanan tanah menggunakan Metode Rankine serta perhitungan stabilitas terhadap keruntuhan kapasitas dukung tanah dihitung berdasarkan persamaan Terzhagi. Dari hasil analisa direncanakan dinding penahan tanah bertipe kantilever dengan dimensi dinding penahan tanah sebagai berikut, tinggi = 6 m, tinggi kovor =  1 m, lebar atas = 3 m, lebar dasar = 4,9 m, tebal kaki = 1,63 m dan tumit = 2,57 m, stabilitas terhadap geser= 2,6 > 1,5, stabilitas terhadap guling= 3,5> 1,5 dan stabilitas terhadap daya dukung 3 dengan σmax = 749 kN/m2 > σa = -55,62 kN/m2. Dari penentuan jenis dinding penahan tanah dihasilkan detail engineering design yang berisi gambar detail dinding penahan tanah kantilever.

Road Laha – Negeri Lima is a causeway connecting Central Maluku Regency and Ambon City which was built in 2012 with a length of 17 km and a width of 4.5 m. Based on geographical conditions, the Laha – Negeri Lima Road section has most hills and slopes so that during high rainfall conditions it can cause slope wall avalanches. The avalanche that occurred reached the pavement area with an avalanche length of 7.4 m. This avalanche resulted in a narrowing of the road body so that it greatly disrupted the activities of road users. The purpose of this study is to produce a type of soil retaining wall that is suitable for use and produce detailed engineering design. In the calculation of soil pressure using the Rankine Method as well as the calculation of stability to collapse, the soil carrying capacity is calculated based on the Terzhagi equation. From the results of the analysis, a cantilever-type soil retaining wall is planned with the following soil retaining wall dimensions, height = 6 m, kovor height = 1 m, top width = 3 m, base width = 4.9 m, foot thickness = 1.63 m and heel = 2.57 m, stability against shear = 2.6 > 1.5, stability against rolling = 3.5> 1.5 and stability to carrying capacity 3 with σmax = 749 kN/m 2 > σa = -55.62 kN/m2. From the determination of the type of soil retaining wall, a detailed engineering design was produced containing detailed drawings cantilever retaining wall.