cover
Filter by Year
Geological Engineering E-Journal
Published by Universitas Diponegoro
Articles
85
Articles
PERENCANAAN PERKUATAN LERENG PERUMAHAN CITRALAND MANADO, SULAWESI UTARA

Yulianto, Fredy Aditya ( Program Studi teknik Geologi Universitas Diponegoro, Semarang ) , Suprapto, Dwiyanto Joko ( Program Studi teknik Geologi Universitas Diponegoro, Semarang ) , Rachwibowo, Prakosa ( Program Studi teknik Geologi Universitas Diponegoro, Semarang )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (299.85 KB)

Abstract

Movement of soil often found in the State of Indonesia and is one of the natural disasters that can damage and harm humans each year. Indonesia most of the territory is hilly and mountainous, it is what makes our country vulnerable to catastrophic ground motion. This condition coupled with high rainfall as a trigger of ground motion. PT. Ciputra International is one company that is engaged in the development of housing. Housing development in the implementation problems encountered Citraland Manado local ground motion (local). Even landslides in Cluster 4 Eden Bridge damage homes and 6 people died. The cause of the avalanche is the presence of high rainfall and the presence of cracks in the rocks of the area. In anticipation of this problem, mapping and planning geotechnical slope reinforcement. Some of the data that is needed is the type of rock, heavy rock, fracture conditions, slope geometry, and rock mechanics of data. The lithology of the research sites is a tuff, sand gravel, volcanic breccias, soil embankment and sand. Based on the research generated sites prone to landslides for slope stability analysis is then performed using the software slides and phase2. The location of the Church of the Holy Kalam and Northern Hill still potentially complex landslide, being Cluster Eden Bridge is secure. At the location of the Church of the Holy Kalam, which meets the safety factor in both dry and water-saturated conditions are 1.423 and 1.349 which is a combination between the anchor and grouting grouting on the slopes and at the summit. While the location of the Northern Hill barrow, which meets the safety factor in both dry and water-saturated conditions are 1.505 and 1.494 which is the slope reinforcement using grouting.

KAJIAN KLASIFIKASI MASSA BATUAN DAN ANALISIS STEREOGRAFIS TERHADAP STABILITAS LERENG PADA OPERASI PENAMBANGAN TAMBANG BATUBARA AIR LAYA, DESA TANJUNG ENIM, KABUPATEN MUARA ENIM, SUMATERA SELATAN

Atmaja, Dian Arfa ( Program Studi Teknik Geologi )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1469.479 KB)

Abstract

Slope stability problems on an open pit mine is a very important issue because it involves issues of human safety, mining equipment, and other infrastructure that is located around the excavation slopes. PT. Pamapersada is a coal mining contractor company that uses open pit system. Based on experience, sometimes avalanches or cracks occur in excavated slopes. To determine the relationship between the classification of the rock mass and slope stability slope forming material is necessary to do a research on the matter. Research sites located in  Tambang Air Laya pit. This is because the TAL Pit excavation area that has considerable variation in complex geological structures.Geological mapping carried out to determine the distribution of lithology and geological structures contained in the Tambang Air Laya Pit. Geotechnical mapping carried out to classify the rock mass based on Rock Mass Rating.From the field observations, the study area was divided geologically into four lithologic units, sandstone, mudstone, andesite, and coal. Based on the classification of the rock mass, the study area was divided into 4 types of rock mass: Type 1 rock mass composed of andesite with RMR value of 92 (very good rock), rock mass composed of type 2 rather weathered sandstone with RMR value of 80 (good rock), rock mass type 3 is composed of moderately weathered sandstone 50-70 RMR value (fair rock), type 4 is composed of claystone with 44-62 RMR value (fair rock).  Slope stability analysis using the program Slide Ver. 5, was conducted to determine the stability of existing slopes, changes in slope geometry, and simulated slopes formed by a type of rock mass. The results of the analysis showed that the TAL Pit slope design is in a state unsafe with Fk between 1:19 - 1,248.

ANALISIS SENSITIVITAS PEMODELAN ANALOG SANDBOX UNTUK MENGETAHUI PERKEMBANGAN STRUKTUR SESAR NAIK

Asmarakandy, Dimas ( Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro ) , Suprapto, Dwiyanto Joko ( Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro ) , Fahrudin, Fahrudin ( Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (3888.566 KB)

Abstract

Pemodelan sandbox adalah salah satu jenis pemodelan analog dalam ilmu geologi yang memiliki tujuan utama yaitu simulasi gaya, deformasi dan evolusi struktur cekungan sedimen. Terbentuknya struktur geologi berupa sesar naik (thrust atau backthrust fault) diakibatkan oleh sistem tektonik konvergen dan dapat dimodelkan dengan pemodelan sandbox. Penelitian ini bertujuan untuk memahami mekanisme dan sekuen deformasi dari sistem sesar naik dengan mengetahui hasil deformasi yang berupa pola struktur geologi; mempelajari perkembangan morfologi, pola dan distribusi struktur pada sistem tektonik konvergen; mengetahui variabel pengujian dalam pembentukan deformasi pada pemodelan sandbox. Penelitian dilakukan dari tahap persiapan hingga pelaksanaan. Persiapan yang dilakukan adalah pewarnaan, pengeringan dan pengayakan bahan model yaitu pasir kuarsa Formasi Ngrayong dengan dua macam ukuran butir; kategori ukuran pasir kasar (30-50 mesh) dan kategori ukuran pasir halus (60-80 mesh). Selanjutnya melakukan uji konsistensi alat sandbox. Hingga terakhir menentukan kondisi batas pemodelan seperti ukuran butir, ketebalan dan basement. Pada tahap pelaksanaan, data yang dihasilkan yaitu; foto/ gambar hasil pemodelan, waktu pergerakan dan jumlah sesar yang terbentuk, jarak pemendekan dan perubahan dip sesar, serta perkembangan morfologinya. Struktur yang terbentuk yaitu thrust dan backthrust fault. Morfologi yang terbentuk merupakan sabuk sesar thrust yang perkembangannya ditandai oleh terbentuknya struktur-struktur sesar baru. Jumlah sesar bertambah dan sudut kemiringan sesar pun cenderung bertambah seiring dengan meningkatnya pemendekan. Semakin tebal lapisan pasir maka jumlah sesar yang terbentuk lebih sedikit sebaliknya semakin tipis lapisan maka jumlah sesar yang terbentuk lebih banyak. Perbedaan ukuran butir material akan menghasilkan pola struktur dan jumlah sesar yang berbeda pula.

MODEL KONSEPTUAL PERKEMBANGAN DELTA SEPINGGAN, INTERVAL “MFS 1-MFS 5”, BLOK SOUTH MAHAKAM, CEKUNGAN KUTAI, KALIMANTAN TIMUR

Permana, Irfandi Oky ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Nugroho, Hadi ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Hidajat, Wahju Krisna ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (8295.96 KB)

Abstract

The energy demand  are growing by day,  especially in Indonesia, whereas these needs are not matched by the number of oil and gas production in Indonesia. This case is evidenced by the release of Indonesia as a member of an organization of oil exporting countries on October 9-10, 2008 in Vienna (Kompas, 10 October 2008). Thus required a study on the potential of producing hydrocarbon basin that will be expected to meet the energy demand of the oil and gas in Indonesia. One of the basins in Indonesia is the Kutai Basin which is the largest and widest Tertiary Basin in western Indonesia. The study area is located at the South Mahakam, Kutai Basin, East Kalimantan. This study aims to make conceptual model of delta Sepinggan development. The method included analysis of well log analysis method, 2D seismic analysis method, method of data analysis of rock core and biostratigraphic data analysis method. Based on analysis results can be obtained in the form of variations in lithology information on Sepinggan Zone deltaic sequence at intervals of MFS 1-MFS 5 marker are coal, sandstone, shale and limestone.  Process on Sepinggan Delta are regretion process dominated on Early Miocene – Middle Miocene (N4-N14), and transgretion process on Middle Miocene –Late Miocene (N14-N16). Sedimentation process influenced by East Manpatu Fault that increasing accomodation space in Rocky Field area, so sediment layer in Rocky Field area is thicker 60-150 meter than Zahra-Zidane Field area.

GEOLOGI, ALTERASI HIDROTERMAL DAN MINERALISASI DAERAH CIURUG DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT

Agus Binsar, Mohammad Tommy ( Program Studi teknik Geologi Universitas Diponegoro, Semarang ) , Aribowo, Yoga ( Program Studi teknik Geologi Universitas Diponegoro, Semarang ) , Widiarso, Dian Agus ( Program Studi teknik Geologi Universitas Diponegoro, Semarang )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1273.931 KB)

Abstract

The existence of metallic minerals in nature is closely related to geological conditions and hydrothermal alteration. hydrothermal alteration and mineralization occur due to hydrothermal solutions that change the physical and chemical properties of rocks and carrying metal elements which will be deposited on rock porosity and permeability have. hydrothermal alteration will make a special characteristic as an altered mineral association. Study of this alteration zone and mineralization will help us to make a plan for metal resources exploration. The purpose of this study was to determine the geological conditions study area include the morphology , lithology , structural geology , hydrothermal alteration zones , mineralization and determine the relationship between geology , hydrothermal alteration , and mineralization.Methods of research is using survey and analysis methods. Survey conducted by the method of data that collected in the field in the form of surface geological   mapping.   The   analysis   method     was     analysis    of    petrology, petrography, X-ray (XRD), and geological structure.Regional geomorphology of Ciurug Area classification based on Van Zuidam (1983) is divided into two units , namely units steep hilly volcanic landforms and volcanic landform units is very steep mountains. Lithology of the study area consists of older to younger andesite breccia , andesite lava, lapilli tuff , tuff , and andesite intrusion . Geological structure of the study area has a north-south direction . Hydrothermal alteration zones are present in the study area is the zone of argillic ( Illit - Kaolin ) , propylitic zone ( Smectite - Chlorite ) , and silicified zones ( Silica - Quartz ) . Mineralization in the area of research in the form of quartz veins and disseminated pyrite and chalcopyrite mineralization as ore deposits . Type of sediment deposition area of research   is  a   low   sulfidation epithermal type.

POTENSI SITUS-SITUS WARISAN GEOLOGI DI AREA KARS GUNUNG SEWU SEBAGAI PENDUKUNG DAN PELUANG PENGEMBANGAN GEOPARK DI INDONESIA UNTUK ASET GEOWISATA KREATIF

Permadi, Reza ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang, Jawa Tengah ) , Rachwibowo, Prakosa ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang, Jawa Tengah ) , Hidajat, Wahju Krisna ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang, Jawa Tengah )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1175.262 KB)

Abstract

Kars Gunung Sewu yang melingkupi wilayah Gunungkidul, Wonogiri dan Pacitan merupakan salah satu kawasan Kars yang paling terkenal di Jawa karena kekhasan dan keunikan Karsnya.  Gunung sewu secara geologi terbentuk dari batugamping berumur Neogen (Miosen Tengah) dengan ketebalan mencapai lebih dari 200 m. Karena ciri khas morfologinya menjadikan Gunung Sewu terpilih sebagai kandidat Geopark (Taman Bumi) di Indonesia. Geopark merupakan suatu konsep manajemen pengembangan kawasan secara berkelanjutan, yang memadu-serasikan tiga keragaman alam, yaitu keragaman geologi (geodiversity), keragaman hayati (biodiversity), dan keragaman budaya (cultural diversity), dengan tujuan untuk pembangunan serta pengembangan ekonomi kerakyatan yang berbasis pada asas perlindungan (konservasi) terhadap ketiga keragaman tersebut.  Sebanyak 30 geological heritage dan 3 non-geological heritage yang berada di Kawasan Kars Gunung Sewu yang diakui sebagai geopark atau taman geologi nasional oleh Badan Geologi Kementerian Energi Sumber Daya Mineral. Situs-situs ini ditargetkan akan dikelola oleh masyarakat dengan berbasis pemberdayaan masyarakat.Berdasarkan hasil analisis citra landsat Area Kars Gunung Sewu dikelompokkan menjadi 4 Satuan yaitu : Unit K1 Dataran Tinggi Kars, Unit K5 Dataran Alluvial Kars, Unit K6 Doline dan Unit K8 Lembah Kering (Brahmantyo B, 2006). Hasil analisis SWOT dan scoring self-assesment yang melingkupi Keadaan Geologi, Struktur Manajemen, Edukasi Lingkungan, Geotourism dan Perkembangan Ekonomi Daerah secara berkelanjutan didapat nilai 73,25%, angka tersebut (lebih dari 50 %) yang berarti Kawasan Kars Gunung Sewu sangat layak untuk bergabung ke dalam Jaringan Global Geopark National oleh UNESCO. Sebab, pengembangan kawasan geopark memiliki dampak yang sangat besar untuk pariwisata yang mendorong pertumbuhan ekonomi masyarakat setempat juga kebutuhan Negara.

ANALISIS SIKUEN STRATIGRAFI DAN PEMODELAN FASIES FORMASI TANJUNG BERDASARKAN DATA LOG SUMUR DAN DATA INTI BATUAN PADA LAPANGAN MIR CEKUNGAN BARITO, KALIMANTAN SELATAN

Ridwan, Muhammad Ilham ( program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Nugroho, Hadi ( program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Aribowo, Yoga ( program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Indah, Mill Sartika ( Development Geologist PT Pertamina UTC, Jakarta Pusat ) , Putra, Perdana Rakhmana ( Development Geologist PT Pertamina UTC, Jakarta Pusat )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (987.705 KB)

Abstract

Increased consumption of energy resources of oil and gas, exploration and exploitation process results performed optimally. Interpretation of subsurface using well log data combined with geological disciplines becomes very important in increasing exploration. Location of the study lies in one of the field located in the Barito basin of South Kalimantan province owned by Pertamina UTC. This research was done in the implementation of the final project addressed the subject of mapping subsurface using sequence stratigraphic approachs.The purpose of this research is to determine the type of lithology, facies and depositional environment, sequence stratigraphy, distribution of sedimentation and facies modelling Tanjung Formation in the MIR field. This research is using descriptive method and analytical methods. Descriptive method is a method that does some literature review. While the analysis method is using qualitative analysis to determine the type of lithology, stratigraphy and facies modeling sequence. This analysis uses software petrel 2009 in an analysis of well logs in the distribution of lithology, stratigraphic marker horizon correlation, subsurface mapping and facies modelling.Based on the results of the data analysis and discussion, it can be interpreted that the Tanjung Formation in the MIR field has a type silisiklastik sandstone lithology (sandstone), shale (shale) and coal (coal) with depositional environment in estuarine area. The results of the analysis of stratigraphic marker is 2 MRS (Maximum Surface Regression), 5 FS (Flooding Surface), 2 MFS (Maximum Flooding Surface) and 1 SB (Sequence Boundary) with sequence stratigraphic unit 2 Lowstand System Track (LST), 2 Transgressive System Track (TST) and Highstand System Track 1 (HST). Direction of sedimentation cycles in Tanjung Formation sequence stratigraphy approach leads to Northwest – South east (NNW - SSE). Facies models are divided into two zones: the ZR1 zone and ZR2 zone, where the zone was conducted to calibrate the rock core data. Based on core analysis Estuary facies rocks have Chanel and Tidal flat on Keywell. According to core data support and electrofasies in the study site, there are 3 facies deposition environmental: Chanel Estuary , Tidal flat and Tidal Bars.

ANALISIS PROVENANCE, DIAGENESIS DAN LINGKUNGAN PENGENDAPAN SERTA PENGARUH TERHADAP KUALITAS RESERVOIR BATUPASIR FORMASI TALANG AKAR, SUMUR FA-21, CEKUNGAN JAWA BARAT UTARA

Abdillah, Fahmi ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Nugroho, Hadi ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Fahrudin, Fahrudin ( Program Studi Teknik Geologi Universitas Diponegoro, Semarang ) , Priyantoro, Agus

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (5366.074 KB)

Abstract

The necessary of technology at this time resulted the necessary of energy resources will increasing, and it also result the scarcity of energy resources. One of the energy resources that is still used as a major energy resource is oil and gas. To overcome these problems, exploration activities at this time needs to be further improved. In the field of exploration, one of the most important things to know is reservoir. Reservoir quality is important for us to know so that we can determine whether an area has hydrocarbon potential to be developed or not. The main parameters of reservoir quality are porosity and permeability.In this study discussed the analysis of provenance, diagenetic and depositional environment of the sandstone reservoir of Talang Akar Formation, North West Java Basin and from the results of the analysis will be associated with the effect on reservoir quality. To determine the reservoir quality based on these parameters, can be done by several methods such as petrographic, cores, SEM and XRD analysis. From the analysis that has been done can be seen that the provenance of Talang Akar sandstone is Granite. So it can be seen that the Talang Akar sandstone which the provenance is Granite has good reservoir quality, with porosity values ranging from 19.04% to 24.28% and permeability ranging between 30-674 mD or belonging to the class good - very good (Koesoemadinata, 1980). Then the diagenetic process that occurs is compaction, cementation, replacement and dissolution. The process of compaction, cementation and replacement leads to reduced rock porosity values ranging from 2.25 to 11.5%, while the dissolution process resulting in increased rock porosity is about 1.5 - 2%. The depositional environment of the Talang Akar Sandstone is Upper Delta front. Rock facies in the upper delta front has good reservoir quality, with porosity values range from 19.04% to 24.28% and permeability range between 30-674 mD or belonging to the class is good - very good (Koesoemadinata, 1980). 

ANALISIS FASIES BATUAN SEDIMEN SERTA HUBUNGANNYA DENGAN PARAMETER KUALITAS BATUBARA BERDASARKAN ANALISIS UJI PROKSIMAT PADA LAPANGAN EKSPLORASI PT ANUGERAH LUMBUNG ENERGI, TAMBANG KINTAP, KABUPATEN TANAH LAUT, PROVINSI KALIMANTAN SELATAN

Sasongko, Yudistira Aji ( Program Studi Teknik Geologi UNDIP )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (2453.555 KB)

Abstract

Asam-asam Basin is one of the basins where to be found good quality coals in Kalimantan, especially in the the Eocene Tanjung Formation. The studies of Tanjung Formation have been done by other researchers, but study devoted to the Tanjung Formation of Asam-asam Basin has not been done yet. The purpose of this study was to determine the lithological characteristics found in the study sites, geological structure, sedimentary rock facies, as well as studies about the relationship between sedimentary rock facies with quality parameters of coal based on laboratory proximate test analysis. The study was conducted using descriptive methods include case study research and direct observation in the field through geological mapping and stratigraphic measurements, as well as analysis method include performed data processing as a result of field observation and other supporting data. The processed data is presented in the form of lithology columns, maps, and data of geological structure. After that performed the laboratory analysis includes analysis of sedimentary facies and structural analysis of geology. In the final stage is the interpretation of sedimentary facies and their relationship with quality parameters of coal based on proximate test analysis. Based on the results of research, it is known that geological structures that develop in area of research are systematical joints with main force direction North-Northeast (NNE) - South-Southwest (SSW), normal faults with a trending fault plane Southwest - Northeast , as well as the reverse fault with a trending fault plane Northwest - Southeast. From the facies analysis, rocks of older age at study sites are sedimented on transitional lower delta plain environment, with sub-environment includes swamp, interdistributary bay, distributary channels, and crevasse splay; whereas the younger rocks are sedimented in the lower delta plain environment, with sub-environment includes swamp, interdistributary bay, distributary channel, crevasse splay, and tidal flats. There are 11 coal seams exposed as the results of the field observations, from the oldest to the youngest age are seam L2, L1, L30, M25, M50, and M30 whose are sedimented in the transitional lower delta plain environment, also seam R1, R15, R2, R 3-1 and R 3-2 whose are sedimented in the lower delta plain environment. Based on the proximate analysis test, it is known that : ash values ranged 7-50%, classified as moderate to high (Graese, 1992); sulfur total values ranged from 0.34 to 1.06%, classified as moderate to high category (Hunt, 1984); and calorific value ranges from 2836 - 6693 kcal/kg, and the relatively low quality coal to high quality (Directorat General of Mineral and Coal, 2011; within Indonesian Coal Resources Development and Future Direction Of Coal Export). Based on the value of ash (ash content), total sulfur, and calorific value, it is known that in general, the coal seams whose sedimented at the transitional lower delta plain environment have better quality than the coal seams of lower delta plain environment.

EVALUASI DESAIN TAHAP 1 DISPOSAL SWD 11 PIT 116 TAMBANG BATUBARA DISTRIK BAYA DESA SEPARI, KECAMATAN TENGGARONG SEBERANG, KABUPATEN KUTAI KARTANEGARA, KALIMANTAN TIMUR

Kusuma, Roni Cahya ( Jurusan Teknik Geologi, Fakultas Teknik Universitas Diponegoro )

Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Original Source | Check in Google Scholar | Full PDF (2184.255 KB)

Abstract

Kegiatan eksploitasi batubara dengan sistem penambangan terbuka melakukan kegiatan pengambilan batubara dan batuan yang tidak digunakan seperti material overburden dan interburden. Kemudian, material yang tidak digunakan tersebut ditimbun kembali di disposal.  Pembuatan disposal harus dilakukan dengan baik, apabila tidak, akan timbul adanya tanah longsor yang akan mengganggu aktivitas eksploitasi batubara. Selain itu pembuatan disposal harus mencukupi target kapasitas  timbunan.Penelitian tugas akhir ini bermaksud untuk menganalisis kestabilan lereng, mengevaluasi, dan melakukan perhitungan kapasitas desain awal dan desain baru (redesign) disposal SWD 11 yang terletak di site Baya, Kalimantan Timur. Metode yang dilakukan adalah penyelidikan langsung lapangan yang bersifat deskriptif  ke disposal  SWD 11 untuk mengetahui geometri lereng serta tipe longsoran dan kegiatan laboratorium untuk mengetahui bobot isi (g), kohesi (c) serta sudut geser (f) dalam timbunan tanah pada disposal NED 2 sebagai acuan. Analisis kestabilan lereng unuk menentukan nilai faktor keamanan dari lereng disposal. Metode analisis kestabilan lereng menggunakan metode Bishop simplified dan Janbu simplified. Analisis kestabilan dan permodelan lereng disposal  menggunakan bantuan perangkat lunak Slide 6.0 serta permodelan desain disposal menggunakan perangkat lunak AutoCad dan Minescape.Berdasarkan hasil evaluasi desain awal disposal SWD 11 memiliki nilai faktor keamanan £ 1,2 sehingga termasuk kedalam kondisi tidak aman. Untuk menghasilkan nilai faktor keamanan ³ 1,2 perlu adanya konstruksi counter weight pada kaki lereng disposal, serta untuk mengoptimalkan kapasitas  disposal dilakukan penggeseran timbunan dan counter weight menjauhi kolam lumpur (sump) dan mengubah lereng tunggal timbunan disposal dari 37° menjadi 40°. Kapasitas  disposal SWD 11 mengalami peningkatan sebesar 1.016.342,3 ton atau setara dengan peningkatan 5% setelah dilakukan perubahan menjadi desain baru. Pengaruh parameter sifat fisik dan mekanik tanah yang mempengaruhi kestabilan lereng disposal SWD 11 antaralain unit weight (γ), kohesi (c), sudut geser dalam (f). Semakin besar nilai unit weight (γ) maka nilai faktor keamanan mengalami penurunan rata-rata 4,4%, semakin besar nilai kohesi (c) maka nilai faktor keamanan mengalami kenaikan rata-rata 8,4%, semakin besar sudut geser dalam (f) maka nilai faktor keamanan mengalami kenaikan rata-rata 15,3%.