GEOLOGI DAN KESTABILAN LERENG LOWWALL DI PIT PELIKAN PT KALTIM PRIMA COAL, KECAMATAN SANGATTA UTARA, KABUPATEN KUTAI TIMUR, KALIMANTAN TIMUR

Laesary, Virginia Grace Thesia Yoanita (2023) GEOLOGI DAN KESTABILAN LERENG LOWWALL DI PIT PELIKAN PT KALTIM PRIMA COAL, KECAMATAN SANGATTA UTARA, KABUPATEN KUTAI TIMUR, KALIMANTAN TIMUR. Other thesis, UPN "Veteran" Yogyajarta.

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Abstract

4
Sari
Operasi tambang terbuka batubara masih terus dilakukan hingga saat ini. Salah
satu tambang terbuka yang masih aktif terdapat di daerah Sangatta Utara, Kabupaten
Kutai Timur, Provinsi Kalimantan Timur pada Izin Usaha Pertambangan (IUP) PT
Kaltim Prima Coal. Daerah penelitian ini terdapat fenomena kelongsoran pada lowwall
terjadi di Pit Pelikan, pada lereng yang sama di sisi utara mengalami kelongsoran dan
di sisi selatan lereng tersebut stabil, sehingga diperlukan kajian kestabilan lereng dalam
desain galian. Tujuan dari penelitian ini adalah mengidentifikasi penyebab fenomena
potensi kelongsoran pada lowwall yang sama dan menganalisis pengaruh hubungan
antara kemiringan lapisan, tinggi lereng, dan posisi lapisan lemah pada lereng lowwall.
Metodologi yang digunakan pada penelitian ini adalah pengumpulan data primer
di lapangan dan hasil uji laboratorium serta data sekunder berupa data bor dan penelitian
terdahulu baik dalam bentuk tulisan maupun peta serta analisis. Data tersebut kemudian
diolah menggunakan software Arcgis dan Slide 6.0.
Berdasarkan aspek geomorfologi, daerah penelitian terdiri atas satuan perbukitan
homoklin terkikis (D1), lahan hasil penggalian (A1), lahan hasil timbunan (A2), dan
sump (A3). Stratigrafi daerah penelitian tersusun oleh satuan batulempung-Balikpapan,
satuan batupasir-Balikpapan yang berumur Miosen Tengah - Miosen Akhir. Dari analisa
parameter kelongsoran pada lowwall Pit Pelikan didapatkan hasil analisis parameter
kelongsoran didapatkan adanya perbedaan parameter yang signifikan yaitu nilai UCS
dan keberadaan lapisan lemah. Untuk mengatasi kelongsoran pada lowwall Pit Pelikan
tersebut maka dibuat grafik pengaruh kemiringan lapisan terhadap faktor keamanan.
Dengan metode ini diharapkan dapat memberikan informasi mengenai penentuan lereng
lowwall yang optimum dengan melihat nilai dip dan posisi lapisan lemah.
Kata kunci : Geologi, Lowwall, Longsor, Kemiringan Lapisan, Kestabilan Lereng
5
Abstract
Nowadays, open-pit coal mining still exists. One of the example of active open pit
mining was founded in Sangatta Utara, Kutai Timur, Kalimantan Timur (IUP PT Kaltim
Prima Coal). There was a landslide phenomenon in lowwall that happened in Pit
Pelikan. There was also a landslide that happened on the same side on the north
downhill, but in the south downhill condition was stable. Based on this situation, there
was needed research and analysis about the stability of the downhill related to the
mining design. The goal of this research was to identify the cause of the landslide
potency in the same lowwall and analyze the effect between the tilt level, height level,
and the position of the weak part of the downhill that happens in the lowwall.
The methodology in this research was by collecting primary data in the field and
laboratory tests, and secondary data from laboratory tests in the form of bor drilling
and past research in the form of written and mapping analysis. All of those data were
analyzed using Arcgis and Slide 6.0 software.
Based on geomorphological aspects, the research area consisted of eroded
homocline hill units (D1), excavated land (A1), filled land (A2), and sumps (A3). The
stratigraphy of the study area was composed of mudstone-Balikpapan units and
sandstone-Balikpapan units of the Middle Miocene - Late Miocene age. From the
analysis of the landslide parameters on the Pelikan Pit lowwall, the results of the
landslide parameter analysis showed that there were significant differences in
parameters, namely the UCS value and the presence of weak layers. To overcome
landslides on the lowwall of the Pelikan Pit, a graph was made of the influence of the
slope of the layer on the safety factor. With this method, it was hoped that it could
provide information regarding determining the optimum lowwall slope by looking at the
dip value and position of the weak layer.
Keywords: Geology, Lowwall, Landslide, Layer slpoe, Slope stability

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Geology, Lowwall, Landslide, Layer slpoe, Slope stability
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Geography
Depositing User:	Eko Yuli
Date Deposited:	02 Oct 2023 01:31
Last Modified:	02 Oct 2023 01:31
URI:	http://eprints.upnyk.ac.id/id/eprint/37751

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