MARPAUNG, ORLANDO (2024) GEOLOGI DAN OPTIMASI GEOMETRI LERENG PADA TAMBANG TERBUKA PIT X SITE ASMI, KECAMATAN KAPUAS TENGAH, KABUPATEN KAPUAS, PROVINSI KALIMANTAN TENGAH. Other thesis, UPN Veteran Yogyakarta.
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Abstract
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GEOLOGI DAN OPTIMASI GEOMETRI LERENG
PADA TAMBANG TERBUKA PIT X SITE ASMI,
KECAMATAN KAPUAS TENGAH,
KABUPATEN KAPUAS, PROVINSI KALIMANTAN TENGAH
ABSTRAK
Orlando Marpaung
111.200.075
Daerah penelitian secara administratif terletak di Desa Barunang, Kecamatan
Kapuas Tengah, Kabupaten Kapuas, Provinsi Kalimantan Tengah dalam area kerja PT.
Pamapersada Nusantara. Secara regional, daerah penelitian termasuk dalam fisiografi
Cekungan Barito. Secara stratigrafi, daerah penelitian masuk dalam Formasi Tanjung
berumur Eosen. Berdasarkan hasil pemetaan, daerah penelitian dibagi menjadi 2
bentuklahan asal dan 4 bentuklahan yaitu, bentuk asal antropogenik yang terdiri dari
lahan galian tambang (A1), kolam tambang - sump (A2), dan lahan hasil timbunan
tambang - disposal (A3), bentuklahan asal denudasional yaitu perbukitan
bergelombang (D1). Stratigrafi daerah penelitian dari tua ke muda disusun oleh Satuan
batulempung Tanjung berumur Eosen dan terendapkan secara tidak selaras diatasnya
Endapan Disposal berumur Resen. Metode penambangan yang digunakan berupa
metode penambangan terbuka (open-pit mining). Metode ini dapat menghasilkan
lereng-lereng terjal yang memiliki potensi kelongsoran. Analisis kestabilan lereng
perlu dilakukan guna memastikan lereng tambang yang aman dengan nilai Faktor
Keamanan (FK) ≥1,3 pada kondisi statis, mengacu kepada KEPMEN ESDM No. 1827
K/30/MEM/2018 dengan pendekatan statis. Selain faktor keamanan, nilai ekonomis
juga harus diperhatikan dengan melakukan pengoptimalan pada geometri lereng
tambang untuk memperoleh nilai stripping ratio (SR) yang lebih optimal. Analisis
dilakukan dengan menggunakan metode kesetimbangan batas berupa metode
Morgenstern-Price dengan menggunakan kriteria keruntuhan Generalized Hoek-
Brown yang memiliki parameter utama berupa Geological Strength Index (GSI),
konstanta mi, dan nilai disturbance factor (D). Optimasi dilakukan dengan mengubah
nilai single slope dari setiap lereng. Pada sayatan A-A’, single slope desain awal 450
diperoleh nilai FK 2,304 dan pengoptimalan single slope menjadi 500 diperoleh nilai
FK 1,829. Pada sayatan B-B’, single slope desain awal 450 diperoleh nilai FK 1,544
dan pengoptimalan single slope menjadi 500 diperoleh nilai FK 1,403. Pada sayatan
C-C’, single slope desain awal 450 diperoleh nilai FK 1,437 dan dinyatakan sudah
optimal. Pada sayatan D-D’, single slope desain awal 450 diperoleh nilai FK 1,437 dan
dinyatakan sudah optimal. Pada sayatan E-E’, single slope desain awal 450 diperoleh
nilai FK 1,396 dan dinyatakan sudah optimal. Mengacu pada desain awal, nilai
stripping ratio pada pit x adalah 12,52 dan pada desain hasil optimasi diperoleh nilai
stripping ratio sebesar 10,25.
Kata kunci: Batubara, Faktor Keamanan, Formasi Tanjung, Stabilitas Lereng
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GEOLOGY AND OPTIMIZATION OF SLOPE GEOMETRY
AT PIT X OPEN PIT MINE ASMI SITE,
KAPUAS TENGAH SUB-DISTRICT,
KAPUAS DISTRICT, CENTRAL KALIMANTAN PROVINCE
ABSTRACT
Orlando Marpaung
111.200.075
The study area is administratively located in Barunang Village, Kapuas
Tengah Sub-district, Kapuas Regency, Central Kalimantan Province within the work
area of PT Pamapersada Nusantara. Regionally, the study area is included in the
Barito Basin physiography. Stratigraphically, the study area is included in the Eocene-
aged Tanjung Formation. Based on the mapping results, the study area is divided into
2 landforms of origin and 4 landforms, namely, anthropogenic origin consisting of
mine excavation land (A1), mine pond - sump (A2), and mine dump - disposal land
(A3), denudational origin landforms namely undulating hills (D1). The stratigraphy of
the study area from old to young is arranged by the Eocene-aged Tanjung mudstone
unit and deposited unconformably on top of the Resen-aged Disposal Deposits. The
mining method used is open-pit mining. This method can produce steep slopes that
have the potential for landslides. Slope stability analysis needs to be carried out to
ensure safe mining slopes with a Safety Factor (FK) value ≥1.3 under static conditions,
referring to KEPMEN ESDM No. 1827 K/30/MEM/2018. In addition to the safety
factor, economic value must also be considered by optimizing the geometry of the mine
slope. The analysis was carried out using the limit equilibrium method in the form of
the Morgenstern-Price method using the Generalized Hoek-Brown collapse criterion
which has the main parameters in the form of Geological Strength Index (GSI), mi
constant, and disturbance factor (D) values. Optimization was done by changing the
single slope value of each slope. In incision A-A', the initial design single slope of 450
obtained an FK value of 2.304 and optimizing the single slope to 500 obtained an FK
value of 1.829. At incision B-B', the initial design single slope of 450 obtained an FK
value of 1.544 and optimizing the single slope to 500 obtained an FK value of 1.403.
In the C-C' incision, the initial design single slope of 450 obtained an FK value of
1.437 and was declared optimal. In the D-D' incision, the initial design single slope of
450 obtained an FK value of 1.437 and was declared optimal. In the E-E' incision, the
initial design single slope of 450 obtained an FK value of 1.396 and was declared
optimal. Referring to the initial design, the stripping ratio value at pit x is 12.52 and
the optimized design obtained a stripping ratio value of 10.25.
Keywords: Coal, Safety Factor, Tanjung Formation, Slope Stability
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Coal, Safety Factor, Tanjung Formation, Slope Stability |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Eko Yuli |
| Date Deposited: | 09 Aug 2024 02:39 |
| Last Modified: | 09 Aug 2024 02:41 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/40658 |
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