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All Journal Jurnal Geocelebes PROMINE KURVATEK International Journal of Hydrological and Environmental for Sustainability Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan JURNAL TEKNOLOGI MINERAL FT UNMUL
Novandri Kusuma Wardana
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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RELIABILITAS ANALISIS BALIK KELONGSORAN LERENG LOWWALL DENGAN PENDUGAAN PARAMETER GEOTEKNIK DAN REMEDIASI LERENG MENGGUNAKAN METODE BEDA HINGGA Novandri Wardana; Dian Eka Aryanti; Rochsyid Anggara
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2083

Abstract

Faktor ketidakpastian dan parameter variabilitas spasial batuan menjadi faktor penting dalam konsep menganalisis kestabilan lereng. Karakteristik massa batuan yang menunjukkan sifat acak (random) menghasilkan pola distribusi tertentu. Masalah keandalan dalam beberapa segment dapat menggunakan metode tradisional seperti metode kesetimbangan batas (LEM). Sedangkan, untuk metode numerik yang lebih detail dalam perhitungan menggunakan Metode Finite Difference. Finite Difference Methods (FDM) merupakan sebuah metode numerik untuk menganalisis reliabilitas lereng batuan yang menggabungkan teori analisis batas plastis, elemen kaku dan teori pemrograman matematika metode Monte Carlo. Kemiringan batuan dipisahkan menjadi blok antarmuka (interface) menggunakan metode beda hingga untuk menetapkan medan tegangan statis. Selain dari itu, model pemrograman stokastik untuk melakukan analisis reliabilitas lereng batuan yang ditetapkan sesuai FK berdasarkan parameter kekuatan geser interface variabel acak. Dalam Perhitungan FK menggunakan metode sampling Point Estimate Methods dalam penenentuan Probabilitas Kelongsoran. Hasil Analisis menunjukkan bahwa analisis reliabilitas lereng sangat dipengaruhi oleh variabilitas yang melekat pada sudut lereng (friction angle) dan kondisi hidrogeologi pada batuan. Kata kunci: Finite Difference Method, Back Analysis, Point Estimate Method, Reliabilitas, Shear Strength Interface
Aplikasi Uji Kuat Geser Dalam Remediasi Lereng Tambang Aspal Di PT Karunia Alam Indonesia Kec. Lasalimu Kab. Buton, Provinsi Sulawesi Tenggara Novandri Kusuma Wardana
PROMINE Vol 5 No 1 (2017): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1499.559 KB) | DOI: 10.33019/promine.v5i1.114

Abstract

Mining activities iscommonlyto work with the problem of deformation or rock movement, this is causingthe shift of rock mass and generated in the occurrence of landslides activity. Slope Stability Analysisrequired that the slope in stable condition. Therefore, stable bench is needed to prevent failure benchthat bring about interference either tool traffic or loading material during production process. Testing ofUCS value is done on 6 lithology that is on asphalt lithology, mudstone, siltstone, sandstone andclaystone. Based on the results of laboratory testing show that value of cohesion and friction angle togenerate by using Generalized Hoek Brown Failure Criterion method.The values of cohesion andfriction angle in asphalt are 0.080712 MPa and 26.3176 º. Asphalt Rock Mass Strength Value is0.145453 MPa. The values of cohesion and friction angle in mudstone are 0.075424 MPa and17.4773º. Rock Mass Value The mudstone rock is 0.220617 MPa. The values of cohesion and frictionangle in siltstone are 0,105107 MPa and 28,2864º. Rock Mass Strength siltstone rock is 0.311426MPa. The values of cohesion and friction angle in the sandstone are 0.180389 MPa And 38.9621º.Rock mass strength sandstone rock is 0.739092 MPa. The values of cohesion and friction angle insiltstone are 0.180389 MPa And 38.9621º. The Power of Mass The siltstone rock is 0.739092MPa.The values of cohesion and friction angle in mudstone are 0.180389 MPa And 38.9621º. RockMass Strength value The mudstone rock is 0.739092 MPa. Given that in Geological Strength Indexmethod only qualitative data will be more accurate using RMR method so it can get quantitative data.
Analisis Kestabilan Lereng Berdasarkan Kekuatan Geser Massa Batuan Terhadap Perubahan Kandungan Air Pada Tambang Batubara Di Area Blok Menyango Novandri Kusuma Wardana
PROMINE Vol 7 No 2 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v7i2.1645

Abstract

Mining activities is commonly to work with the problem of stability of rock mass, then befordesaining mine’s slope should know rock shear strength parameters, such as cohesion (c) andinternal friction angle value ( . Beside those parameters, also needed to know the impact ofwater content to the rocks. The water content will effect rock’s shear strength, proof by the rockcondition which is ductile when it is dry and soft when it is wet. Based on test results was doneusing sandstone with laboratory scale of direct shear test were analyzed using mohr – coulomband patton criteria (1966). It is known that the cohesion (c) of sandstone decreased from 510,35kPa at natural condition down to 133,75 kPa at wet condition. The internal friction angle ( ) alsodecreased from 54,56° at natural condition down to 48,45° at wet condition. The reduction of theshear strength is caused by fragments and clay minerals characteristics which are so reactiveand very easy to absorb water so that the cohesion of the sandstone reduce the active normalstress so that working the shear stress required to cause the shear failure becomeweaker. From the results, it is also known that the shear surface roughness had a lot ofinfluence on the shear strength the normal stresses applied on the direct shear tests werevery low under 20% of UCS.
Analisis Rekah Tarik Lereng Sidewall Penambangan Blok Menyango Berdasarkan Reliabilitas Kemantapan Lereng Menggunakan Metode Finite Difference Novandri Kusuma Wardana
PROMINE Vol 8 No 2 (2020): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v8i2.2142

Abstract

Probability analysis is method in geotechnical parameter to solve problem on the stability of the mining slope. It explains values of distribution parameters based on data type of laboratory test results and field investigations result as a back analysis of the mining slope. Sidewall slopes had sliding plane due to tension crack as wide as 18 cm with a length of 150 meters had potential failure, so back analysis of slope stability is needed. Condition of uncertainty the rock of the slope when the increase saturation level 23% so that it gives a greater water pore pressure. Slopes with a geometry of sidewall 10 m high and a single slope angle of 50 ° require redesign of a height of 7 meters and a single slope angle of 42 °. The results of FK calculations obtained for the IRA slope were 1.24 with a probability of failure of 23.12% and the overall slope with FK 1.31 with a probability of failure of 18.27%. The results of the distribution of random variables using Chi - Square obtained Normal and Lognormal distributions for sandstones, Normal and Exponential distribution for claystone, and Lognormal distribution for siltstone.
Neraca Keseimbangan pada Sumberdaya dan Cadangan Bijih Bauksit serta Bijih Nikel di Indonesia Muhammad Bahtiyar Rosyadi; Novandri Kusuma Wardhana
Retii Prosiding Seminar Nasional ReTII Ke-14 2019
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The government in the context of adding information on the wealth of natural resources in this connection is iron ore and nickel ore in Indonesia, as well as economic forecasts and analysis which are not periodically owned by the stakeholders. Data validation of iron sand and nickel resources has not been documented accurately because there is no coordination and synchronization of companies and associations - very diverse, different from other agencies or institutions. From the analysis it is known that the initial value of bauxite resources in 2017 amounted to 1.72 billion tons exploited by 1.15 million tons, the discovery of new exploration results amounted to 2.33 billion tons, to be the final balance of 4.45 billion tons with the price of bauxite resources of US $ 289.83 billion. New exploration results were 1.94 billion tons and the final balance was 5.65 billion tons, with a nickel ore price of US $ 29, the economic value of nickel resources was US $ 164.08 billion. The results of the analysis are expected to provide benefits as a database in the management of bauxite and nickel ore resources.
ANALISIS KESTABILAN LERENG UNTUK OPTIMASI ENDAPAN BA-TUBARA DI AREA LOWWALL PIT XYZ PT. KIDECO JAYA AGUNG KECAMATAN BATU SOPANG KABUPATEN PASER PROVINSI KALIMANTAN TIMUR Trynovianti Putri Malik; Supandi; Novandri Kusuma Wardana
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Abstract Pit XYZ is one of the Pits at Pt. Kideco Jaya Agung, where there is a lowwall area that has experienced landslides and as the area still has coal deposits, coal sediment optimization will be carried out. In the optimization of coal deposits, it is necessary to do a back analysis to determine the value of geotechnical parameters (cohesion and inner friction angle) so that the value of the safety factor on the actual slope is known and it can provide recommendations for safe and stable geometric designs. This research is conducted using quantitative methods. In the data processing, a back analysis is performed on each section. The analysis of safety factors and recommendations for slope geometry is carried out using the Morgenstern-Price method. The results show the actual slope stability value for section A with FK = 1,090 and section B with FK = 1,082. After obtaining the FK and PK values on the actual slopes, an optimization design was made for each section with FK = 1,025 and FK = 1,032 for section A and B respectively. This optimization design does not meet the criteria so the researcher makes geometric design options for each section, section A has a value of FK = 1.399% and section B has a value of FK = 1.301. Key words: safety factor, optimum geometric design
Perkuatan Lereng Jalan Menggunakan Shotcrete Pembangunan Ruas Jalan Segmen 01 Tawang-Ngalang (Studi Kasus Proyek Jalan PT. Arena Reka Buana) Yudi Yudi Dwi Kurniawan; Novandri Kusuma Wardana; Anggi Hermawan
Retii 2022: Prosiding Seminar Nasional ReTII ke-17
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Salah satu permasalahan geografis indonesia adalah terdapat banyaknya perbedaan elevasi permukaan tanah yang berpotensi timbulnya bencana alam kususnya bencana tanah longsor. Salah satu contohnya ada pada rencana pembangunan ruas jalan segmen 01 Tawang-Ngalang yang terkendala dengan galian dalam sehingga terdapat beda elevasi yang membentuk sebuah lereng. Tujuan dari penelitian ini untuk mencari Faktor Keamanan (FK) lereng pada kondisi asli dan kondisi setelah dilakukan perkuatan dengan soil nailing dan shotcrete serta mencari pengaruh geometri soil nailing terhadap nilai faktor keamanan dengan metode kesetimbangan batas dan menggunakan software Slide V7.0 by rocscience. Material properties didapat dari hasil uji sifat fisik dan uji sifat mekanik di laboratorium. Sementara geometri lereng dan spesifikasi shotcrete dan soil nailing tidak dirubah. Berdasarkan hasil analisis didapat nilai FK lereng tanpa perkuatan berkisar 0,736-0,987 dengan metode Bishop, Janbu, Morgenster – Price. Setelah dilakukan perkuatan dengan variasi panjang 0,5H, 0,75H dan 1H dengan sudut 20°, 25°, 30°, 35° didapat nilai FK terendah 1,033 dan FK tertinggi 1,772. Pengaruh sudut pada pemasangan soil nailing hanya menaikan FK 0,5%-3% dan pengaruh panjang soil nailing terhadap nilai FK adalah 8%-15%. Pada Sta 1+800 didapat geometri efektif adalah 0,75H dengan sudut 27,5°, Sta 1+825 0,75H dengan sudut 29° dan Sta 1+850 1H dengan sudut 31°
ANALISIS STABILITAS LERENG JALAN SEGMEN 01 PEMBANGUNAN RUAS JALAN TAWANG-NGALANG, NGLANGGERAN, KABUPATEN GUNUNGKIDUL, PROVINSI DAERAH ISTIMEWA YOGYAKARTA Veno Sholitha; Anggi Hermawan; Novandri Kusuma Wardana
Retii 2022: Prosiding Seminar Nasional ReTII ke-17
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Kondisi geografis di Gunungkidul merupakan salah satu sub zona fisiografi pegunungan yang didominasi perbukitan-pegunungan dan terdapat formasi geologi sehingga relatif peka terhadap longsor. Untuk mencegah terjadinya longsor diperlukan analisa stabilitas lereng pada lokasi tersebut. Penelitian ini bertujuan untuk menganalisa faktor keamanan dan probabilitas keruntuhan lereng kondisi asli pada pembangunan ruas jalan segmen 01 Tawang-Ngalang Nglanggeran, kabupaten Gunungkidul, Daerah Istimewa Yogyakarta. Analisis penelitian ini menggunakan kesetimbangan batas dengan analisa probabilitas menggunakan software slide V7.0 by reocscience dengan pemodelan dua dimensi. Penelitian ini menggunakan data primer dan sekunder untuk analisis dan pemodelan pada 3 sta lereng jalan yang memiliki geometri yang berbeda, material properties diperoleh dari hasil pengujian laboratorium fisik dan mekanik. Berdasarkan hasil analisis lereng pada 3 pemodelan lereng menujukkan nilai faktor keamanan 0,651 – 1,172 dengan dan probabilitas keruntuhan 49,612 – 99,615% menggunakan metode janbu dan spencer, hasil penelitian menunjukkan faktor keamananan lereng rendah dan tingkat probabilitas kelongsoran pada lereng tersebut tinggi sehingga kemungkianan terjadinya longsoran sangat tinggi, disamping itu lokasi penelitian merupakan bidang diskontinu yang relatif peka terhadap longsor. Oleh karenaa itu sebagai rekomendasi dilakukan pemasangan perkuatan sortcreate dan soil nailing pada bidang geometri lereng
Pengambilan Data Cycle Time Menggunakan Aplikasi Seconds Count Pada Kajian Produktivitas Alat Gali Muat PT. X Bram Lanjaya; Novandri Kusuma Wardana; Bayurohman Pangacella Putra
Retii 2022: Prosiding Seminar Nasional ReTII ke-17
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

In the productivity study, there are several things that are done to achieve maximum productivity, including observing loading patterns and cycle time recording. Cycle time recording is usually done manually with stopwatch and stationery. Recording in this way has a fairly large level of measurement error, therefore another method is needed to carry out cycle time measurement activities so as to produce more accurate circulation time calculations, one of which is with the help of the Seconds Count application. The purpose of this study is to identify and analyze the effectiveness of using the Seconds Count application. The use of the Seconds Count application makes it easier to perform data retrieval and analysis of actual front conditions. The results of productivity calculations using data obtained from the Seconds Count application are compared with productivity calculations using Truck Count data and the largest difference is 5.27% so that the use of the Seconds Count application in the study of productivity of digging tools can be concluded to be effective. Keywords: Seconds Count, productivity, cycle time
Comparative Analysis of Actual Conditions and Results of Technical Calculations Using Gumbell Method in Mine Dewatering System: A Case Study on Calculation of Rainfall and Runoff Water Discharge Pangestu, Wahyu Yudha; Adnyano, A.A Inung Arie; Wardana, Novandri Kusuma
International Journal of Hydrological and Environmental for Sustainability Vol 2, No 2 (2023): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v2i2.231

Abstract

This research was conducted at PT. Antareja Mahada Makmur on the mining concession owned by PT. Multi Harapan Utama which is located in Sungai Payang Village, Loa Kulu District, Kutai Kartanegara Regency, East Kalimantan Province. The rainfall data used is for 10 years (2012-2021) which comes from the Dewatering Mining Engineering Department. Data analysis was performed by statistically calculating rainfall data using the Gumbell method to obtain the planned rainfall value. Then the calculation of runoff water discharge is carried out to analyze the existing mine drainage system by comparing the actual conditions and the results of technical calculations. Based on the results of the research for rainfall data for 2012 – 2021, Gumbell's calculations plan to collect rainfall of 94.23 mm/day, rainfall intensity of 14.74 mm/hour with a return period of 5 years and a hydrological risk of 89.26%. The total for the Gumbell method runoff discharge is obtained for runoff water entering the Sump 90 Besar of 2.19 m3/second, runoff water entering the Sump 90 Lorong of 3.03 m3/second, and for water discharge runoff that goes into Sump 100 is 3.68 m3/second. The three open channels in the form of trapezoids and culverts have met the theoretical calculation dimensions, with dimensions that are still able to accommodate and drain runoff water discharge. For three dimensions of the actual sump that is currently smaller than the theoretical calculation of the well volume, the sump capacity calculation obtained a recommended sump volume of 47,045 m3 for a 100 sump, for a sump 90 lorong of 43,012 m3, and for a sump 90 besar of 40,635 m3, with recommended dimension improvements. The operating speed of the pump needs to be increased for the Multiflow  MF - 420 pump on a sump 90 lorong from 1159 m3/hour to 1224 m3/hour with an efficiency of 65%, Multiflow  MF - 420 pump on a sump 90 besar from 1123 m3/hour to 1269 m3/hour with an efficiency of  70 %, for the Multiflow  MF - 420 pump at sump 100 from 1282 m3/hour to 1584 m3/hour with an efficiency of 65%.
Co-Authors A.A Inung Arie Adnyano, A.A Inung Arie Agustian, Wewen Agustinus Isjudarto Anggi Hermawan Bayurohman Pangacella Putra Bram Lanjaya Bungalan, Elsy Thiansy Demanson Ornansah Sinaga Dian Eka Aryanti Erry Sumarjono Fadilah Gilang Prasetyo Faisol Mukarom Hery Widijanto Jannah, Salsabila Raudlotul Junior, Prince Robert Lase, Agus Sudarman Mahardika, Yudi Mataheru, Juan Aknes Muhammad Bahtiyar Rosyadi Nofry Hence Tarumasely Pangestu, Wahyu Yudha Partama Misdiyanta Purnoma, Hendro Putri Nadya, Adinda R. Andy Erwin Wijaya Rizqi Prastowo Rochsyid Anggara Supandi Trynovianti Putri Malik Veno Sholitha Yudi Yudi Dwi Kurniawan