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PENGARUH DISKONTINUITAS MASSA BATUAN VOLKANIK TERHADAP STABILITAS LERENG DI DAERAH JELAPAN DAN SEKITARNYA, KECAMATAN PUNDONG, KABUPATEN BANTUL, DAERAH ISTIMEWA YOGYAKARTA Rakhman, Arie Noor; Triheriyadi, Nur Widi Astanto Agus
Jurnal Teknologi Technoscientia Vol 10, No 1 (2017): Vol 10 No 1 Agustus 017
Publisher : IST AKPRIND YOGYAKARTA

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This research is intended to know the effect of discontinuity on the mass of volcanic rock for rock slope stability. The study sites are located at Jelapan area and its surrounding, Pundong District, Bantul Regency, Special Region of Yogyakarta. With stability assessments of rock slopes, it can be used to identify potential disasters of rock mass movement, direction of movement and recommendations for disaster risk minimization. Analysis of the continuity on the mass of volcanic rock using rock mass classification of rock mass rating system (RMR) (Bieniawski, 1989). The data used are physical properties, index properties, mechanical properties, orientation of joint position and rock slope. The synthesis of data is done mainly on morphological data, stratigraphy, geological structure to know the control of geological condition on the stability of volcanic rock slope in research area.Based on the calculation of the rock mass classification of RMR, the cliff at 7Â°59â20,88â LS 110Â°19â19,09â BT is 28 which is considered poor. The RMR value is controlled by intensive joints that dominate with joint spacing less than 60 mm; the condition of the surface of the joint field is smooth and continuous, estrangement joint 1 - 5 mm, slightly weathered with a value RQD 43.37%. Rock mass that collapses and landslides are lava and andesite breccia. The rock fall occurs following the slope of the planar plane of the platy joint structure and the rock contact N170Â°E/32Â°. It is interpreted by the initial stress control with high anisotropic stress at the edge of the slope.

POLA SEBARAN BATUBARA FORMASI NANGGULAN KABUPATEN KULONPROGO DAERAH ISTIMEWA YOGYAKARTA Heriyadi, Nur Nur Widi Astanto Agus Tri; Tania, Dina
Jurnal Teknologi Technoscientia Vol 10, No 2 (2018): Vol 10 No 2 Februari 2018
Publisher : IST AKPRIND YOGYAKARTA

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Coal is one of the energy resources still become the primary needs of strategic energy for sustaining national energy in Indonesia. This study discusses coal existence in Nanggulan Formation at Yogyakarta area. Coal distribution pattern in Nanggulan Formation can provide the geometry conception base on the geological research in Watupuru area encountered three coal outcrop (OC_1, OC_2, and OC_3) stratigraphically is at the bottom layer.Coal distribution in the research area influenced by the pattern of anticline structure which has the position of the wing of East and West with the relative anticline axis of north-south direction. Reconstruction results show there is two-seam of coal, for the first seam layer have 0,55 meters thickness and for the second seam layer have 20,57 meters thickness. Seam 1 of reconstructed surface data has spread on the East side of the anticline. Seam 2 stratigraphically under seam 1 of the reconstruction results indicate that the spread is close to the anticline axis and spreads on the east side of the anticline with a 26o slope and the western wing side of the anticline with a slope 10o.

ANALISIS KEKUATAN MASSA BATUAN ANDESIT MENGGUNAKAN KAIDAH KRITERIA KERUNTUHAN HOEK-BROWN UNTUK MENGETAHUI NILAI FAKTOR KEAMANAN LERENG PADA DAERAH SELOHARJO, KECAMATAN PUNDONG, KABUPATEN BANTUL, DIY Heriyadi, Nur Widi Astanto Agus Tri; Tania, Dina
Jurnal Teknologi Technoscientia Vol 11, No 1 (2018):
Publisher : IST AKPRIND YOGYAKARTA

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IDENTIFIKASI JELAJAH GEOLOGI GUNUNG API PURBA GUNUNG IRENG DESA PENGKOK, KABUPATEN GUNUNGKIDUL Sri Mulyaningsih; Nur Widi Astanto Agus Tri Heriyadi; Dina Tania; Suhartono Suhartono
Jurnal Pariwisata Vol 6, No 2 (2019): Jurnal Pariwisata
Publisher : LPPM Universitas Bina Sarana Informatika

Gunung Ireng di Desa Pengkok adalah destinasi wisata baru geologi gunung api purba di Kecamatan Patuk, Kabupaten Gunungkidul, di samping Gunung Nglanggeran. Selain aglomerat, sebagaimana penciri geologi Gunung Api Purba Nglanggeran, breksi vulkanik, lava bersruktur meniang, dike, dan blocky lava berkomposisi andesit menyusun Gunung Ireng. Makalah ini disusun untuk mengidentifikasi kealamian jelajah alam geologi gunung api purba Gunung Ireng sebagai destinasi wisata minat khusus geowisata. Metode yang digunakan adalah studi dan analisis konektivitas Gunung Ireng terhadap destinasi-destinasi wisata lain di sekitarnya dan identifikasi keragaman data geologinya. Penelitian menjumpai morfologi bukit melingkar berbentuk kubah, yang dikelilingi lembah berslope ~30-55o yang melandai ke baratlaut. Dari atas bukit terlihat Gunung Wayang (Nglanggeran di ujung timur), karst Selopamioro di arah selatan, Sudimoro di arah barat dan tinggian Patuk di sebelah utara. Jalur konektivitas telah menghubungkan Gunung Ireng dengan Gunung api Nglanggeran-Oro-Oro, Dlingo, Selopamioro dan Kali Ngalang-Gedangsari. Promosi dan dukungan sepenuhnya dari pemerintah Kabupaten Gunungkidul, serta optimisme pengelola adalah kunci keberhasilan Gunung Ireng untuk disejajarkan dengan destinasi-destinasi wisata minat khusus lain di sekitarnya; mendukung keberlanjutan Geopark Gunung Sewu.

PENGARUH DISKONTINUITAS MASSA BATUAN VOLKANIK TERHADAP STABILITAS LERENG DI DAERAH JELAPAN DAN SEKITARNYA, KECAMATAN PUNDONG, KABUPATEN BANTUL, DAERAH ISTIMEWA YOGYAKARTA Arie Noor Rakhman; Nur Widi Astanto Agus Triheriyadi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This research is intended to know the effect of discontinuity on the mass of volcanic rock for rock slope stability. The study sites are located at Jelapan area and its surrounding, Pundong District, Bantul Regency, Special Region of Yogyakarta. With stability assessments of rock slopes, it can be used to identify potential disasters of rock mass movement, direction of movement and recommendations for disaster risk minimization. Analysis of the continuity on the mass of volcanic rock using rock mass classification of rock mass rating system (RMR) (Bieniawski, 1989). The data used are physical properties, index properties, mechanical properties, orientation of joint position and rock slope. The synthesis of data is done mainly on morphological data, stratigraphy, geological structure to know the control of geological condition on the stability of volcanic rock slope in research area. Based on the calculation of the rock mass classification of RMR, the cliff at 7°59’20,88” LS 110°19’19,09” BT is 28 which is considered poor. The RMR value is controlled by intensive joints that dominate with joint spacing less than 60 mm; the condition of the surface of the joint field is smooth and continuous, estrangement joint 1 - 5 mm, slightly weathered with a value RQD 43.37%. Rock mass that collapses and landslides are lava and andesite breccia. The rock fall occurs following the slope of the planar plane of the platy joint structure and the rock contact N170°E/32°. It is interpreted by the initial stress control with high anisotropic stress at the edge of the slope.

POLA SEBARAN BATUBARA FORMASI NANGGULAN KABUPATEN KULONPROGO DAERAH ISTIMEWA YOGYAKARTA Nur Widi Astanto Agus Tri Heriyadi; Dina Tania
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 2 Februari 2018
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Coal is one of the energy resources still become the primary needs of strategic energy for sustaining national energy in Indonesia. This study discusses coal existence in Nanggulan Formation at Yogyakarta area. Coal distribution pattern in Nanggulan Formation can provide the geometry conception base on the geological research in Watupuru area encountered three coal outcrop (OC_1, OC_2, and OC_3) stratigraphically is at the bottom layer.Coal distribution in the research area influenced by the pattern of anticline structure which has the position of the wing of East and West with the relative anticline axis of north-south direction. Reconstruction results show there is two-seam of coal, for the first seam layer have 0,55 meters thickness and for the second seam layer have 20,57 meters thickness. Seam 1 of reconstructed surface data has spread on the East side of the anticline. Seam 2 stratigraphically under seam 1 of the reconstruction results indicate that the spread is close to the anticline axis and spreads on the east side of the anticline with a 26o slope and the western wing side of the anticline with a slope 10o.

ANALISIS KEKUATAN MASSA BATUAN ANDESIT MENGGUNAKAN KAIDAH KRITERIA KERUNTUHAN HOEK-BROWN UNTUK MENGETAHUI NILAI FAKTOR KEAMANAN LERENG PADA DAERAH SELOHARJO, KECAMATAN PUNDONG, KABUPATEN BANTUL, DIY Nur Widi Astanto Agus Tri Heriyadi; Dina Tania
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 1 Agustus 2018
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The study area has a steep hill morphology with dominant lithology of andesite lava from the Ngelanggran Formation. Steep morphology with water saturated conditions and platy joints on andesite lava as rock discontinuities with different properties and weathering can be weaking the slope stability. Analysis of the rock mass strength of andesite lava with Hoek-Brown collapse criteria using GSI, mi, uniaxial compressive strength, and D values can be used to obtain rock strength in the form of cohesion (c) and internal friction angle (ɸ), to be applied in the analysis of slope stability. The safety factor (FS) on the slope concists lithology and platy joints and massive using the equilibrium limits approach on the natural slopes shows on safe conditions (FK = 7.5). On very steep slope (slope angle 80o) in LP S09B location which is the former slope of mining activity with lithology andesit platy jointings have strong slopes, and in the field of rock mass movement shows the result of FK value = 1.3 which is below the PU standard (> 1.5). Slope reinforcement can be done by lowering slope angle up to 75o so that the safe conditions at FS = 2.4.

STUDI REKOMENDASI PENGGALIAN DITINJAU DARI STRUKTUR BIDANG LEMAH DAN KEKUATAN BATUAN LAVA ANDESIT DI DAERAH GIRIMULYO, KECAMATAN GIRIMULYO, KABUPATEN KULONPROGO, PROPINSI DAERAH ISTIMEWA YOGYAKARTA Nur Widi Astanto Agus Triheriyadi; Arie Noor Rakhman
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 9 No 1 Agustus 2016
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Andesite mining material needs both for industrial development and may be available by way of mining activities. Girimulya area, District Girimulyo, Kulon Progo has abundant natural resources, among which andesite. This study aims to determine the direction of the excavation recommendation in terms of structure and a weak field strength andesite lava rock. Identifying physical properties and mechanical properties of materials on the excavation carried out as igneous rock andesite lava.Collecting data in the field include: plotting the location of observation; identification of rocks and weathering; data recording and sampling rock geology and weathering. Sampling each location point observations were made in the form of samples disrupted. Research in the laboratory / studio in the form of observational petrology, testing the physical properties of rocks and analysis of compressive strength / UCS. Along with field research and laboratory / studio, also conducted research relevant literature.Andesite in the study area is a product of the old volcanic activity that is part of the Old Andesite Formation. In the field, andesite lava fields have a weak form of fracture. Based on the graphical method Pettifer and Fookes (1994) in terms of the structure of the field is weak and the mining rock mechanics properties including the criteria for Easy Ripping to Very Hard Ripping. If it will be mining should be conducted prior to demolition andesite lava rock. Heavy equipment Bulldozer recommended that the type D6, D7, D8 and D9. Furthermore it can be dug with a backhoe to be loaded and transported.

Mentoring and Training in Developing Gunung Ireng Geotourism, Patuk District, Gunungkidul Regency, Yogyakarta Special Region Sri Mulyaningsih; Dina Tania; Nurwidi Astanto Agus Tri Heriyadi; Suhartono Suhartono
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 7, No 4 (2021): December
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Gunung Ireng geosite is an excellent geoheritage that is also a part of the Gunungsewu UNESCO Global Geopark in Pengkok, Gunungkidul Regency. It is widely recognized as an experiential leisure tour destination with the sunrise, sunset, and milky way watching as its activities. The primary attraction is the natural museum of Tertiary submarine paleo-volcanic miniature that was developed during the Early Miocene (±20-23 million years ago). Mentoring in utilizing the resources is necessary. The local community has agreed to develop geotourism as an effort to conserve the cultural, biotic, and geological environment. The certified instructors or mentors and professionals used mentoring methods to increase the local community’s abilities in preparing, managing, and evaluating the geotourism, including management, advertisement, marketing, guidance, web hosting, culinary, and accommodations.. The results are the status of the geoheritage area (by the Ministry of Energy and Mineral Resources No. 13 K.HK.01.MEM.G.2021), the viral of the local Gunung Ireng’s Spot Festival, the local culinary facilities, the CHSE certificate, as well as up to 300% increase in visitors per month before the pandemic and 200-300% increase during the pandemic. Other results that have successfully developed the supporting attractions are the Ahad Pon traditional market, the footsteps flashback of the great da'wah Sunan Kalijogo on Gunung Ireng and the Geological Natural Track of the Ancient Volcano of Gunung Ireng. Those three attractions are the efforts to improve the local community's economy, nature, and cultural conservation as the solid implementations of geotourism activities. Qualitatively, these various efforts are now starting to show impacts, with the increased motivation of the community to focus more on developing this destination, and the increasing attention of local governments to support these conservation activities, although quantitatively it has not to be measured yet.

PENERAPAN KECERDASAN BUATAN PADA PENILAIAN KELAYAKAN EKONOMI TAMBANG BATUBARA hidayatullah sidiq; Nur Widi Astanto Agus Tri Heriyadi
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2278

The economic feasibility valuation method is very important in determining the value of a project. The existence of high uncertainty in the mining industry, both from a technical and non-technical perspective, causes the risk of mining projects to be relatively higher compared to other industries. uncertainty is modeled by an unbroken probability series. This distribution is widely used to model uncertainty from non-technical factors such as commodity prices. To describe the uncertainty of the variable input in the simulation, the monte Carlo simulation technique can be used. In addition, to predict the selling price of coal using the bat algorithm. The results show that the prediction of coal prices is one of the parameters that are difficult to predict. To determine the selling price can use a predictive approach with the help of artificial intelligence. The price prediction using the Monte Carlo simulation results in the selling price of coal with calories 5700 kcal/kg is $ 42.2 per tonne. If using the bat algorithm is $ 42.18 per tonne. The feasibility analysis of a mining project using the DCF method shows the result NPV Maximal on stripping ratio 2.5 with a coal volume is 20 million tonnes.

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