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PEMODELAN PEMASANGAN PENYANGGA SEMENTARA MENGGUNAKAN PERANGKAT LUNAK PHASE 2 PADA HEADRACE TUNNEL CHAINAGE 265 M â 375 M DI PLTA TULIS KABUPATEN BANJARNEGARA, JAWA TENGAH Nugraha, Lulu Febri
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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Implementation of development Hydroelectric Power Plant (HEPP) Write a dam will be constructed of concrete type dam times Write Banjarnegara district. Water from the dam Write dams planned for suplesi plan Maung, by creating a tunnel from the dam Write Merawu towards Kali. Water from the tunnel entrance on the upstream dam plan Maung. Before the water reached the Kali Merawu, formerly used as power plant turbines. So the head race tunnel tunnel work. Making the tunnel is strongly influenced by the mass of rock above the tunnel or overburden. Modeling research purposes pit tunnel condition before reinstalling the system buffer and temporary buffer on the tunnel design using Phase2 software so that it can determine the type most suitable buffer while the tunnel chainage chainage 306 m and 347 m The method used in this study with experimental methods. Using the help of Phase2 software to help model some temporary buffer to buffer variations in the form of bolts while concrete and benton shoot. Determining whether or not the buffer is safe while the results of the use value of the total displacement, and finite element. From the use of one of these parameters the total displacement (total collapse), there is a scale from chainage 306 m and 347 m chainage have total displacement 0.0222129 and 0.0165611 m m. Of the total displacement that there are more than 0.005 m, then at chainage 306 m and 347 m chainage unsafe and finite element number is less than 4 then the class of models Masaa rocks found on the chainage is less than 4 including unsafe. Type of buffer used in the form of concrete shot but shows the total value of less than 0.005 m dispalcement then coupled with the type of buffer while steel. Modeling is done in class IIIa and IIIb rock mass unsafe. It is necessary to increase the zone of concrete screws are indicated collapse. Zones are shown by the broken keterdapatan finite element.

PEMETAAN GEOLOGI PADA PENAMPANG 140 UNTUK MENGETAHUI SEBARAN LITOLOGI, ALTERASI, MINERALISASI, DAN DENSITAS VEIN BESERTA HUBUNGANNYA DENGAN KEBERADAAN ZONA HIGH GRADE ORE PADA ENDAPAN PORFIRI BATU HIJAU PT. NEWMONT NUSA TENGGARA TENGGARA Qamarih, Siti Nurul
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Geological Engineering E-Journal

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Mineral mining industry is much needed at the present time given themetal commodities is increasing from year to year. With increasing demands this,and the search for an evidentiary contained mineral reserves requires severalsteps in exploration activities in the early stages and update data. Batu Hijau is aporphyry copper-gold deposition (Cu-Au) with its formation is controlled by thedistribution of lithology, alteration processes, and vein density. The purpose of this study was to determine the distribution of lithology,alteration, mineralization, and vein density and its relationship with the presenceof high grade ore that is focused on section 140. The method used in this final study was conducted logging geologyconsisting of 14 drill holes, highwall mapping at a distance of Â± 200 m, located onthe Northwest wall and across the Southeast section 140, and blasthole polygonmapping lies in the Northwest and Southeast the cross section 140. Based on drill hole logging, highwall mapping and blasthole mapping,lithology found growing at the study site consists of volcanic rock, equigranularquartz diorite rocks, tonalite intermediates rocks, and young tonalite rocks.Alteration consists of developing secondary biotite alteration (potassicalteration), partial biotite alteration (potassic alteration), pale green micaalteration (phyllic alteration), and chlorite-epidote alteration (propyliticalteration). Mineralization developed in the study site consists of bornite mineralcomposition largest copper 0.63% followed by 0.34% mineral chalcopyrite andpyrite minerals as mineral broadcaster.In the analysis stage is divided into themineralized zone, the dominant of mineral bornite (Bn> Cp> py), the dominant ofmineral chalcopyrite (Cp> Bn> py) and the dominant of mineral pyrite (Py> Cp>Bn). Vein density were found in the location of research classified as veindensity> 10%, vein density is 5% -10%, vein density is 3% -5%, and the density ofveins <3% with type vein vein consists of type A, type B vein, vein type C andmagnetite veins. The presence of high grade ore zone at section 140 contained inthe intermediate tonalite lithologies that are host rock mineralization along siderocks in contact with intermediate tonalite rocks on stage secondary biotite andpale green mica alteration, the dominant mineralization bornite and chalcopyrite,with vein density > 5%. Thus prioritized production targets on the physicalconditions.Â

PENYELIDIKAN ZONA AKUIFER DENGAN SURVEI PENDUGAAN GEOLISTRIK METODE SCHLUMBERGER STUDI KASUS DAERAH KECAMATAN KALIWUNGU DAN SEKITARNYA, KABUPATEN KENDAL, JAWA TENGAH Nasution, Enda Mora
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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Morphological differences research area affect to subsurface conditions. To determine subsurface conditions and hydrogeological conditions of the study area, then conducted research with geoelectric method.Geoelectric is a geophysical method used to determine geological subsurface conditions based on the variation of the resistivity of the rock types. Research area is located in Kaliwungu, Kendal Regency, Central Java. This area consisted by Damar Formation (QTd) and Alluvium Deposits (Qal). Damar Formation consisted by 3 lithological units, named : volcanic breccia, tuffaceous sandstones and conglomerates. Alluvium Deposit consisted by of sand, gravel, and pebble. The purpose of this study was to determine the zone and type of aquifer and direction of groundwater flow, based on Schlumberger geoelectrical method and groundwater level measurement on some shallow wells.This research used Schlumberger geoelectrical method. Geoelectric point in the study area totaled 15 points and as many as 16 MAT measurement data points are scattered in the study area. Data processing is done using software IPI2win to determine the actual value of resistivity and thickness of each layer and Surfer9 to determine groundwater flow direction.Based on the results of geoelectrical data processing on each lithological resistivity values, this research area formed by rock mudstone (â¤ 10 Î©m), sandy mudstone (10-20 Î©m), sandstones (20-100 Î©m), and volcanic breccia (> 100 Î©m). Lithological type of the aquifer in research area is expected to be sandstones which have a good permeability and porosity. A geoelectrical section and correlation is made to determine the location, dimensions and types of aquifers that occur in the study area. The aquifer type identified by the correlation was uncofined aquifers, perched aquifer and confined aquifer. Groundwater flow direction based on the measurement of shallow wells tend to the north area of research.

PERENCANAAN PERKUATAN LERENG PERUMAHAN CITRALAND MANADO, SULAWESI UTARA Yulianto, Fredy Aditya; Suprapto, Dwiyanto Joko; Rachwibowo, Prakosa
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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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.

EKSPLORASI HIDROKARBON DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DAN KONSEP ANISOTROPI, LAPANGAN RA, WILAYAH BENAKAT BARAT, KECAMATAN BENAKAT, KABUPATEN MUARA ENIM, SUMATERA SELATAN Andryantoro, Rio; Hidajat, Wahju Krisna; Widiarso, Dian Agus; Triyono, F.X. Yudi
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Oil and gas energy still being a high priority industry to support economic of Indonesia, either as source of national income and supply the local energy demands. Development of oil productions decreasing year-by-year, so that, new resources and advance production need to be processed immediately. Oil and gas resources in Indonesia still have a high potential to be developed, one of the high-potential location is Sumatera Island. Tectonic processes made the Tertiary-sedimentary basins in the back of volcanics arc (back arc basin) or in the eastern of Barisan Mountains. South Sumatera Basin was one of those sedimentary basin. Research area located in West Benakat, District of Muara Enim.Among various methods of oil and gas explorations, geoelectric method was chose for th research. This method is relatively simple and inexpensive in cost. Exploration was committed with geoelectric-Schlumberger configuration.Â Analysis processed with anistopy concept. Area of geoelectric measurements located in RA Field, Benakat Barat Area, South Sumatera. The length was various for each line depends onÂ total of measurement stations. The distance between each measurement station is 100 meters with measurements extend 1000 meters in length for each station. Lines which analyzed in this research were line B, D, and J with 53 measurement stations in total, 20 in line B, 17 in line D, and 16 in line J. Data calculation processed with Microsoft Excel until value of medium resistivity acquired. After that, result from calculation processes will be used for 2D modelling using Surfer 8.Based on data calculation and 2D modelling, three hydrocarbon procpect horizons have been interpreted, they are Horizon H1 in depth between 255 â 287 meters with medium resisitivity 0,87 â 6,27 Ohm meter, Horizon H2 in depth between 462 â 483 meters with medium resistivity 2,62 â 11,58 Ohm meter, and Horizon H3 in depth between 595 â 615 meters with medium resistivity 3,04 â 16 Ohm meter.

PENGARUH SEEPAGE DAN KESTABILAN LERENG TERHADAP OPTIMALISASI GEOMETRI LERENG TAMBANG BUKIT M AIR LAYA BLOK TIMUR, UNIT PERTAMBANGAN TANJUNG ENIM Ariana, Diana; Pudjihardjo, Henarno; Fahrudin, Fahrudin; Tunggal, Joko
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Kestabilan lereng merupakan salah satu hal terpenting dalam proses eksploitasi tambang batubara. Diperlukan penyelidikan geoteknik dalam perancangan desain yang aman dan efektif sehingga penambangan batubara dapat dioptimalisasikan. Daerah penelitian dilakukan pada tambang Bukit M Air Laya Blok Timur Unit Pertambangan Tanjung Enim. Lokasi tambang ini berada disebelah barat sungai, penelitian ini dimaksudkan untuk mengetahui pengaruh pola aliran dan kestabilitan lereng dalam optimalisasi geometri lereng.Metode penelitian yang digunakan adalah dengan cara melakukan interpretasi data log borÂ untuk mengetahui karakteristik tiap lapisan penyusun daerah tersebut meliputi data permeabilitas, kohesi, sudut geser serta bobot isi yang nantinya akan diolah menggunakan software Geoslope Seep/w dilakukan untuk mengetahui seberapa besar debit yang akan merembes dan Geoslope Slope/w dilakukan untuk mengetahui nilai faktor keamanan suatu lereng.Analisis rembesan terhadap kestabilan lereng dimodelkan dengan 2 penampang dengan jarak boundary tambang dari sungai yaitu 100m. Dua penampang memiliki elevasi tambang dibawah sungai Enim yaitu penampang C-Câ menghasilkan debit sebesar 3.186e-08 m3/s, penampang D-Dâ menghasilkan debit sebesar 4.768e-08 m3/s. Analisa Slope/w dihasilkan Fk Penampang C-Câ = 1.754 (Stabil) Penampang D-Dâ= 2.509 (Stabil). Penampang E-Eâ =2.310 (Stabil). Untuk desain pelebaran lereng /boundary tambang dilakukan pula analisa kelerengan pada lereng utara dan selatan sebanyak 3 penampang dihasilkan Fk penampang G-Gâ memiliki FK 1.992 (U) dan 1.583 (S). penampang H-Hâ 1.855 (S) dan penampang I-Iâ 1.608 (U) dan 1.904 (S). Dari hasil kajian optimalisasi pelebaran dengan jarak 100 m dari Sungai Enim ke boundary tambang memiliki FK overall slope > 1.72 dengan pengaruh pola aliran dari sungai ke tambang maupun tambang ke sungai dikategorikan tidak terlalu besar sehingga pada daerah ini layak untuk diperlebar atau dioptimalkan.

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

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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 inÂ 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).Â 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; Suprapto, Dwiyanto Joko; Fahrudin, Fahrudin
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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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.

KAJIAN PENGARUH PENGAMBILAN AIRTANAH LOKASI SEKITAR RUMAHSAKIT PENDIDIKAN UNIVERSITAS DIPONEGORO TERHADAP SUMBER AIR MASYARAKAT DENGKEKSARI, KECAMATAN TEMBALANG, KOTA SEMARANG Maharani, Tyas Putri
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Pendidikan Universitas Diponegoro Hospital is located on the CampusÂ of Diponegoro University, Tembalang, Semarang is the hospital that was built for the ministry of health, this condition is certainly to need water to meet their daily.This needs are from groundwater through water sources that are owned. Pendidikan Universitas Diponegoro Hospital to make 3 deepwell with 80-120 metres deep. In addition the Dengkeksari society located in the north of hospital, use spring to provide their daily in water. They live under the clif or rock in front of the hospital. The springs flow hole volcanic brecia layer, then water is used by the society to provide their daily need in water.It needs to do an observation to know aquifer condition used by hospital and society of Dengkeksari. This observation uses schlumberger geoelectric method. So the condition under surface in observation location is detectable. So the location of aquifer used by hospital and the society is known.Based on the result of log geolistrik can be seen that the resource is in aquifer layer primer and deepwell of the hospital are in aquifer layer second, so there is no negatif effect of using the deepwell with the condition of the resource used by dengkeksari because of difference aquifer..

ANALISIS FASIES DAN PERMODELAN SIKUEN STRATIGRAFI BATUAN KARBONAT LINTASAN KORIDO, FORMASI WAINUKENDI, KABUPATEN SUPIORI, PAPUA Shima, Joshua; Nugroho, Hadi; Fahrudin, Fahrudin; Permana, Asep Kurnia
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Korido is located in Supiori District , Papua , Indonesia . This area is in the north of the Central Range and included in the North Irian Basin which is the fore arc basin (Mc Adoo & J.C. Haebig, 1999). Own research area based on geology map created by Masria et al ( 1981) composed by Wainukendi Formation which is composed predominantly by carbonate sedimentary rocks .The purpose of this study is to determine the pattern of lithology and lithological boundaries were obtained from measured stratigraphy along the trajectory of research which is then integrated with the micro facies analysis and facies zone were obtained by petrographic analysis to determine the depositional environment and depositional processes that occur in Wainukendi Formation. More over, the relative age determination is also done based on the analysis of large benthic foraminifera so the deposition process can be integrated with relative age . The ultimate goal of this research is to integrate field data, micro facies analysis results and deposition process analysis results to create a model of sedimentation, determining stratigraphic marker, and the determines system tract that develops in Wainukendi Formation in the study area .The method used in this research is geological mapping focused on stratigraphy subjects in Korido area to getÂ lithostratigraphy sequence, platform type, sedimentation processes, and laboratory analysis include petrographic analysis to determine micro facies and facies zone and paleontological analysis to determine the relative age which then integrated to obtain stratigraphic marker and systems tract that develops in Wainukendi Formation. From the analysis of platform type showed the type of platform existing in this area is rimmed shelf type which is then used as a reference in micro facies analysis according to Wilson (1975) to obtain 4 facies zone that exist in this study area is reef platform margin , slope , toe of slope apron and deep shelf . Based on the analysis of the deposition process obtained 3 cycles of sedimentation that occurred from Wainukendi Formation . From the results of this analysis are used in determining the stratigraphic sequence to obtain stacking patterns that evolve based sequence boundary and its systems tract is composed of LST - TS - MFS - TST - HST so that obtain a full cycle changes in accommodation space and sediment supply where there is an increase in accommodation space which was offset by an increase in the supply of sediment in LST phase is characterized by progradation and agradation, an increase in the supply of sediment is lower than the increase in accomodation space in TST phase is characterized by retrogradation, and lastly, a decrease in accommodation space while sediment supply rate is still high in HST phase characterized by progradation.

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