Analisis Penurunan Muka Tanah (Subsidens) Menggunakan Metode Numerik Di Terowongan Endportal PLTA Kerinci Merangin, Provinsi Jambi.
DOI:
https://doi.org/10.30872/jtm.v12i1.16186Abstract
Indonesia mempunyai banyak potensi energi baru terbarukan, seperti tenaga air, panas bumi, biomassa, tenaga bayu dan surya yang bersih dan ramah lingkungan. Salah satu potensi energi baru terbarukan yaitu PLTA Kerinci Merangin yang berada di kabupaten kerinci, provinsi jambi. Pada konstruksinya PLTA ini menggunakan terowongan sepanjang 12 km sebagai jalur air (waterway) dengan beda elevasi awal terowongan sampai akhir terowongan End Portal adalah 400 meter dan ditargetkan akan menghasilkan tenaga listrik berkapasitas 350 MW (4 X 87,5 MW). Salah satu permasalahan yang di hadapi adalah terowongan merupakan terowongan dangkal (burden ± 35 M), dengan massa batuan yang terkekarkan (jointed rock). Kompleksitas yang terjadi di terowongan Endportal tersebut sangat memungkinkan terjadinya subsidens. Penelitian ini bertujuan untuk mendapatkan pemodelan numerik dengan menggunakan perangkat lunak phase2. Hasil pemodelan didapatkan tiga model yaitu model 1 kondisi terowongan tanpa penyangga dengan meperhitungkan faktor kegempaan didapatkan nilai subsiden maksimum sebesar 60,58 mm. kemudian model 2 terowongan dengan penyangga shotcrete, wiremesh dan rockbolt subsiden maksimum sebesar 57,13 mm. dan model 3 terowongan dengan penyangga shotcrete, wiremesh, rockbolt dan h-beam subsiden maksimum sebesar 47,83 mm. Dari hasil numerik pada penelitian dan dengan mempertimpangkan anjuran SNI 8460:2017 yang membatasi batas subsiden < 50 mm maka yang memenuhi kriteria adalah kondisi terowongan dengan penyangga shotcrete, wiremesh, rockbolt dan H- Beam.
Kata Kunci: Subsidens, Metode Numerik, PLTA Kerinci.
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