Sinaga, Hanswily (2024) Analisis Failure Time Menggunakan Data GPS Geodetic Dengan Metode Inverse Velocity Pada Disposal HW 123 South Tutupan PT. Adaro Indonesia, Kalimantan Selatan. S1 thesis, UNIVERSITAS JAMBI.
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Abstract
PT. Adaro Indonesia merupakan salah satu perusahaan batubara terbesar di Indonesia dengan salah satu operasi produksinya berada di area pit south tutupan. Penelitian ini dilakukan untuk menganalisis failure time yang terjadi di disposal outpit dump area pit south tutupan. Penyebab terjadinya failure yaitu ditemukan adanya free dumping di area disposal yang mengakibatkan terbentuknya genangan air di sekitar disposal hingga curah hujan pada periode tersebut yang cukup tinggi. Dari masalah tersebut maka dilakukan analisis prediksi longsor dengan time window perusahaan (1 hari, 3 hari, 6 hari) dan time window (1 jam, 3 jam, 12 jam). Mengetahui nilai trigger level berguna untuk mendapatkan nilai velocity dari setiap kondisi kestabilan lereng. Dari perhitungan nilai velocity ketiga gps (G21, G73, G76) didapatkan status pergerakan lereng dalam kondisi berada pada kecepatan ˂ 55 mm/hari, kondisi hati-hati berada pada kecepatan 55 mm/hari – 90 mm/hari, kondisi waspada berada pada kecepatan 90 mm/hari – 110 mm/hari, dan kondisi bahaya berada pada kecepatan ˃ 110 mm/hari. Selanjutnya dilakukan analisis prediksi waktu longsor menggunakan data historikal deformasi (1 Januari - 30 Januari) yang digunakan untuk menentukan time window yang relevan dengan kejadian longsor. Dari perhitungan prediksi longsor menggunakan metode inverse velocity didapatkan hasil prediksi longsor dengan time window (1,3,12) jam terjadi pada tanggal (9 februari, 10 februari, 10 februari), sedangkan time window (1,3,6) hari terjadi pada tanggal (11 februari, 12 februari, 14 februari), maka time window yang relevan dengan kejadian aktual adalah time window 3 jam. Dengan time window 3 jam dilakukan prediksi longsor yang akan datang dari data deformasi periode (14 Maret - 30 April). Hasilnya didapat bahwa perkiraan waktu prediksi longsor dengan time window 3 jam terjadi pada 12 juni, sehingga dapat disimpulkan bahwa penggunaan time window dalam memprediksi waktu longsor dianjurkan dalam rentang waktu yang pendek agar mendapatkan hasil prediksi yang akurat. PT. Adaro Indonesia is one of the largest coal companies in Indonesia with one of its production operations in the pit south tutupan area. This study was conducted to analyze the failure time that occurred in the disposal outpit dump area of the pit south tutupan. The cause of the failure was the discovery of free dumping in the disposal area which resulted in the formation of puddles around the disposal to the rainfall during that period which was quite high. From this problem, a landslide prediction analysis was carried out with the company's time window (1 day, 3 days, 6 days) and time window (1 hour, 3 hours, 12 hours). Knowing the trigger level value is useful for obtaining the velocity value of each slope stability condition. From the calculation of the velocity value of the three GPS (G21, G73, G76), the slope movement status was obtained in conditions at a speed of ˂ 55 mm/day, caution conditions at a speed of 55 mm/day - 90 mm/day, alert conditions at a speed of 90 mm/day - 110 mm/day, and danger conditions at a speed of ˃ 110 mm/day. Next, landslide time prediction analysis was carried out using historical deformation data (January 1 - January 30) which was used to determine the time window relevant to the landslide event. From the landslide prediction calculation using the inverse velocity method, the landslide prediction results with a time window of (1,3,12) hours occurred on (February 9, February 10, February 10), while the time window (1,3,6) days occurred on (February 11, February 12, February 14), then the time window relevant to the actual event is a 3-hour time window. With a 3-hour time window, predictions of future landslides were made from deformation data for the period (March 14 - April 30). The results showed that the estimated landslide prediction time with a 3-hour time window occurred on June 12, so it can be concluded that the use of time windows in predicting landslide times is recommended in a short time span in order to obtain accurate prediction results.
| Type: | Thesis (S1) |
|---|---|
| Uncontrolled Keywords: | Disposal, Failure Time, Prediksi Longsor, Time Window |
| Subjects: | L Education > L Education (General) |
| Divisions: | Fakultas Sains dan Teknologi > Teknik Pertambangan |
| Depositing User: | SINAGA |
| Date Deposited: | 06 Jan 2025 04:54 |
| Last Modified: | 06 Jan 2025 04:54 |
| URI: | https://repository.unja.ac.id/id/eprint/73427 |
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