Pengaruh Jarak Antar Drain Hole Terhadap Penurunan Muka Air Tanah pada Lereng Tambang Terbuka Batubara

  • Rahmat Fadhilah Program Studi Teknik Pertambangan, Institut Teknologi Sumatera, Lampung Selatan 35365
  • Lilik Eko Widodo Fakultas Teknik Pertambangan dan Perminyakan, Institut Teknologi Bandung
  • Irwan Iskandar Fakultas Teknik Pertambangan dan Perminyakan, Institut Teknologi Bandung

Abstract

The presence of groundwater on the slopes of the mine, which means that the slopes are saturated with water, will cause a decrease in slope stability. Drain hole is a method that can be applied to decrease groundwater level on a mine slope. This research was conducted to determine the effect of horizontal distance between drain holes on the mine slope on the decrease in groundwater level (groundwater drawdown). Groundwater flow simulation on the slopes of an open pit coal mine with 3 scenarios, without drain holes, 100 m horizontal space between drain holes, and 50 m horizontal space between drain holes, was carried out to answer the goal of this research. The results obtained from the simulation, the third scenario with a distance between drain holes of 50 m has the maximum result compared to the other two scenarios, which are the percentage of groundwater drawdown of 54.1% and groundwater discharge of 167.3 L/s. So it can be concluded that the denser the horizontal distance between the drain holes on the mine slope, the higher the groundwater drawdown on the slope.

Downloads

Download data is not yet available.

References

[1] J. S. Frans and M. H. Nurfalaq, "Studi Geoteknik Pengaruh Muka Air Tanah Terhadap Kestabilan Lereng Tambang Batubara," Indonesian Mining Professionals Journal, vol. 1, pp. 12-21, 2019.
[2] L. B. Seegmiller, "Horizontal Drains - Their Use in Open Pit Mining Dewaterng," Seegmiller Associates, Salt Lake City.
[3] T. A. Cahyadi, L. E. Widodo, R. A. Fajar and A. Baiquni, "Influence of drain hole inclination on drainage effectiveness of coal open pit mine slope," in IOP Conference Series: Earth and Environmental Science, 2018.
[4] R. Erliani, Nurhakim, R. N. Hakim, A. A. Velayati and S. Melati, "Analisis Kestabilan Lereng Low Wall Pit 3 Blok 14 di PT Arutmin Indonesia Tambang Asam-asam," Jurnal Geosapta, vol. 3, no. 1, pp. 21-25, 2017.
[5] G. W. Swana, F. Hirnawan and R. I. Sophian, "Penentuan Desain Lereng FInal pada Pit DH Daerah Konsesi PT. Arutmin Indonesia Tambang Asam-asam," in Prosiding Seminar dan Seminar Nasional Geomekanika ke-1 Tahun 2012 : Menggagas Masa Depan Rekayasa Batuan dan Terowongan di Indonesia, Yogyakarta, 2012.
[6] M. Fauzan, "Skripsi dengan Judul: Pengaruh Perubahan Muka Air Tanah Terhadap Nilai Faktor Keamanan Lereng Highwall Pada Tambang Batubara di Daerah Asam-Asam," Fakultas Teknik Geologi, Universitas Padjadjaran, Bandung, 2014.
[7] M. G. McDonald and A. W. Harbaugh, "A modular three-dimensional finite-difference ground-water flow model: U.S. Geological Survey Open-File Report," USGS, 1984.
[8] A. W. Harbaugh, R. B. Banta, M. C. Hill and M. G. McDonald , "Modflow-2000, The U.S. Geologi Survey Modular ground-water model- User guide to modularixation," USGS, Reston virginia, 2000.
[9] PT Reka Bumi, "Laporan Pekerjaan Konstruksi Sumur dan Uji Pemompaan PT Arutmin Indonesia Site Asam-asam," 2013.
[10] C. W. Fetter, Applied Hydrogeology, New Jersey: Prentice Hall, 2001.
Published
2020-12-20
How to Cite
FADHILAH, Rahmat; WIDODO, Lilik Eko; ISKANDAR, Irwan. Pengaruh Jarak Antar Drain Hole Terhadap Penurunan Muka Air Tanah pada Lereng Tambang Terbuka Batubara. Journal of Science and Applicative Technology, [S.l.], v. 4, n. 2, p. 116-120, dec. 2020. ISSN 2581-0545. Available at: <https://journal.itera.ac.id/index.php/jsat/article/view/369>. Date accessed: 24 jan. 2021. doi: https://doi.org/10.35472/jsat.v4i2.369.