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Analisis Kestabilan Lereng Tambang Menggunakan Metode Janbu Simplified Dengan Pendekatan Probabilitas Kelongsoran Pada PLB Front IV Batukapur IUP OP 206,96 Ha PT. Semen Padang, Indarung, Provinsi Sumatera Barat Dewi Suryani; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 7, No 2 (2022): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v7i2.119047

Abstract

PT. Semen padang is a limestone mining company which is materials for cement manufacturing in lubuk kilangan, padang city. Ore is extracted by open pit mining method with a side hill type system, which is an open mining method that is applied to mine rocks located on hillsides or in the form of hills. The plb (point loading barat) area is one of an activity area for the limestone loading process in iup op 206.96 ha. The mining process causes the rock mass become unstable and has the potential for slope failure.The results of the actual slope analysis using method simplified janbu, the value of the safey factor (SF) is 1.05 and the probability of failures (PF) is 14.6%. And the saturated slope has a safey factor (SF) value is 0.8 and the probability of failures (PF) is 100%. Recommendations of slope geometry based on the results of slide 6.0 software analysis obtained a safety factor (fk) is 1.37 and the probability of failure (PF) is 0.00%. While in  saturated condition the result of  safety factor (fk) is 1.36 and probability of failure (PF)  is 0.00% with a slope height of 70.7 m and a slope of 42°. Based on the sensitivity plot graph, the material that affects the slope stability of plb front IV PT. Semen padang is the cohesion input material (c).
Evaluasi Teknis Sistem Penyangga Berdasarkan Metode RMR-System Pada Lubang D-25 L3 Tambang Batubara Bawah Tanah PT. Dasrat Sarana Arang Sejati (PT. DSAS), Kota Sawahlunto, Sumatera Barat. Aldo Surya Pratama; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 8, No 1 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i1.121836

Abstract

The potential for instability that occurs in rock when digging opening underground will usually always require special handling which functions for two things, the safety of workers and the safety of equipment contained in the mine. This study aims to determine rock mass class, support strength value, opening safety factor and support safety factor, and recommendations for safe supports based on rock class and support dimensions. The weighting of rock mass classes is carried out using the RMR-System method based on Bieniawski 1989. This analysis is carried out by weighting rock values based on parameters: rock compressive strength values, rock quality designation values, discontinuity spacing values, discontinuity condition values, groundwater values , and the joint orientation value to the tunnel. The results of the analysis are rock mass class values, rock strength, failure potential, stand up time values, and support recommendations based on rock mass class values. From the results of theanalysis at 100 m progress from the canopy, class III (Fair Rock) results were obtained for the tunnel wall which was coal, and class II rock (Good Rock) for the roof rock which was siltstone. From the results of the analysis of the strength of the supporting wood based on the wood strength class, it was found that the supporting wood used by PT. DSAS is included in class III wood which has a wood bending strength value of 702.5 kg/cm2 and a wood compressive strength value of 412.5 kg/cm2. Actual FK caps and side posts in hole D-25 L3 PT.DSAS were 1.37 and 5.80 with an average support distance of 1.83 m. FK stamp is still categorized as unsafe because it is below 1.5, so a buffer evaluation is carried out with a buffer distance of 1.67 so that FK ≥ 1.5 is obtained.
Analisis Sistem Ventilasi Tambang Batubara Bawah Tanah Untuk Kebutuhan Operasional Penambangan Pada Lubang Tambang C.2-I Job Site Sapan Dalam PT. Nusa Alam Lestari Parambahan Kota Sawahlunto Insani Sabilillah; Bambang Heriyadi; Jukepsa Andas; Refky Adi Nata
Journals Mining Engineering : Bina Tambang Vol 8, No 1 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i1.122252

Abstract

PT. Nusa Alam Lestari is an underground coal mining company located in Salak Village, Talawi District, Sawahlunto City, West Sumatra. Ventilation system at mine pit C.2-I Job Site Sapan Dalam PT. Nusa Alam Lestari uses a blow system. This study aims to evaluate the quality and quantity of ventilation systems for underground coal mines in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018 and Decree of the Director General of Minerba and ESDM No. 185 K/37.04/DJB/2019 with parameters which include gas content, relative humidity, effective temperature value, work efficiency value and air quantity for mining operational needs. At mine pit C.2-I there is an advanced front and six mining branches. The average temperature measurement results in the working front of the C.2-I mine pit are 29.6oC and with an average humidity measurement result of 94.6%. This temperature value has passed the set threshold between 18oC - 27oC and the humidity has also passed the set threshold, which is 85%. In addition, the C.2-I mine pit does not apply a suction ventilation system, so that dirty air is not immediately transported out. The ventilation system applied to the C.2-I mine pit can only meet 70% of the air demand, so it is necessary to evaluate and design a new ventilation system. The design of the ventilation system is carried out by making a tail gate from the Cross Cut to the surface with an elevation of 15o with a length of 170 m. The end of the through hole is given an 18 inch Centrifugal Exhaust Fan, to suck in dust and dirty air. Making mining layouts using AutoCAD and design simulations using the Ventsim program. The results of the analysis show that the quantity of air in the C.2-I mine hole has increased from 4.08 m3/s to 7.38 m3/s. The design of the new ventilation system results in compliance with the values of air quality and quantity.
Analisis Rancangan Kestabilan Lereng Sidewall Tambang Batubara KUD Sinamar Sakato, Kabupaten Dhamasraya, Provinsi Sumatera Barat Rahmat Zulmy; Bambang heriyadi
Journals Mining Engineering : Bina Tambang Vol 8, No 1 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i1.122380

Abstract

KUD Sinamar Sakato merupakan suatu perusahaan yang bergerak pada bidang pertambangan batubara yang berlokasi di Jorong Sinamar, Nagari Sinamar Kecamatan Asam Jujuhan, Kabupaten Dhamasraya. Pada lereng sidewall terdapat danau dengan luas area 32.058 m2 dan kedalaman danau mencapai 30 meter. Tekanan air yang ada di danau menyebabkan meningkatnya gaya penggerak pada lereng sidewall tambang batubara KUD Sinamar Sakato. Akibat besarnya gaya penggerak dari pada gaya penahan akan menyebabkan terjadinya kelongsoran pada lereng sidewall tambang batubara KUD Sinamar Sakato. Maka itu diperlukan kajian geoteknik seperti uji sifat fisik dan sifat mekanik pada sampel batuan, nilai faktor keamanan aktual dari lereng sidewall, memberikan rekomendasi geometri lereng sidewall dengan ketentuan Kepmen 1827 K/ME/30/2018. Analisis faktor keamanan (FK) dan rekomendasi geometri lereng dengan metode bishop simplified. Hasil yang didapat dari penelitian, pertama dilakukan pemodelan didapatkan nilai faktor keamanan kritis pada lereng aktual sidewall di KUD Sinamar Sakato dengan menggunakan metode bishop simplifiet sebesar 1,041. Kedua, Setelah dilakukan permodelan pada lereng sidewall dengan melakukan resloping sudut overall sebesar 53 derajat, dengan geometri lereng terdiri dari 2 slope, memiliki sudut lereng tunggal sebesar 65, dari geometri tersebut didapatkan nilai faktor keamanan lereng sidewall menggunakan metoda bishop simplified sebesar 1,315. Ketiga, rekomendasi geometri lereng keseluruhan terdiri dari 3 slope dengan sudut overall sebesar 41 derajat, sudut lereng tunggalnya sebesar 65 derajat dan tinggi lereng tunggalnya sebesar 22 m, dengan menggunakan metoda bishop simplified didapatkan faktor keamanan lereng sidewall sebesar 1,302
Analisis Kebutuhan Kualitas dan Kuantitas Udara Menggunakan Software Ventsim dan Kazemaru pada Tambang Bawah Tanah PT. Dempo Maju Cemerlang, Kabupaten Pesisir Selatan, Sumatera Barat febri yanda praja; bambang heriyadi
Journals Mining Engineering : Bina Tambang Vol 8, No 2 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i2.125170

Abstract

Mine engineers can use simulation software such as VentSim and Kazemaru to optimize airflow within the mine and create effective ventilation systems. Comparative analysis between the two software can provide important information about the strengths and weaknesses of each software when optimizing their underground mine ventilation systems. Reliability, computing speed, ease of use, modeling capabilities, accuracy of simulation results, and technical support are some of the factors one might look at in a comparison between VentSim and Kazemaru. In addition, this analysis may include comparison of features, user interface, ease of use, accuracy of simulation results, and time required to perform simulations. Analysis of the data used is quantitative, based on the theory of calculation. The result is quantitative. The focus of the research is the ventilation system used in the PT Dempo Maju Cemerlang mine pit. Mine pit PT. Dempo Maju Cemerlang requires 28.99 m3/s of total air, but based on the conditions at the time the measurements were made, the required amount of air has not been met. The results of calculating the air quantity of the ventilation system used in PT. Dempo Maju Cemerlang is only 24.97 m3/s. Every mining pit of PT. Dempo Maju Cemerlang has a temperature of 22.5–24.1 °C. Air humidity ranges between 88% and 93%. In the simulations performed with ventsim and kazemaru software, Ventsim excels in several features, including dust distribution, visualization and graphing, ventilation efficiency analysis, financial simulations, and an attractive user interface. Keywords:  Air Demand, Software, Ventilation System
Analisis Balik Kestabilan Lereng Disposal di PIT Satelit Dengan Metode Bishop PT. Barasentosa Lestari di Desa Belani, Kabupaten Musi Rawas Utara, Provinsi Sumatera Selatan Anita Sari Sundriya; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 8, No 2 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i2.125147

Abstract

This study focuses on the slope of the disposal pit at Satellite PT Barasentosa Lestari, which experienced a landslide in March 2023. The landslide is a type of arc landslide and involves fractures and fill material such as mud. Therefore, a technical study was required, including a slope stability analysis of the design of the disposal area. The aim is to establish a basis for the establishment of the disposal area, prevent landslides, and optimize its capacity. This study aims to identify the slope stability of the disposal area, update the material properties of the area, provide slope design recommendations, and evaluate the slope safety factor at the study site. Bishop's method was used in this study. The results showed some important points. The slope geometry before the landslide had a total height of 82.152 meters, a slope inclination angle of 6°, and a slope length of 851.338 meters. The material properties of the existing wastedump include a specific gravity of 19 KN/m³, a cohesion of 45 KN/m², and an inner shear angle of 10°. The safety factor before the landslide with these parameters was 1.036. After re-analysis, the factor of safety value became 0.967 with the new material properties: specific gravity 19 KN/m³, cohesion 35 KN/m², and inner shear angle 10°. Slope geometry recommendations using Bishop's method resulted in a factor of safety of 1.394 with a single slope height of 10 meters and a slope angle of 35°. The width of the slope varied from RL -10 to RL 60, with lengths of 100m, 100m, 100m, 70m, 70m, 70m, 100m, and 262m respectively.Keywords: Kestabilan Lereng, Metode Bishop, Wastedump Existing, Faktor Keamanan, Analisis Balik.
Analisis Kuantitas Dan Kualitas Udara Pada Sistem Ventilasi Untuk Keamanan Dan Kenyamanan Pengunjung Di Lubang Pendidikan PT. Bukit Asam Tbk. UPO Sawahluwung Talawi Sawahlunto Sumatera Barat Muhammad Abbil Raihan; Bambang Heriyadi; Mulya Gusman; Heri Prabowo
Journals Mining Engineering : Bina Tambang Vol 8, No 2 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i2.125026

Abstract

The ventilation system is important in underground mines, because the system flows clean air into the mine. If this system is not done or not as it should be, it will cause insecurity and discomfort in the hole. Lubang Pendidikan is a learning facility that has been provided by PT. Bukit Asam Tbk UPO, visitors can learn how to mine well underground, educational pits using a suction ventilation system and using a 2 x 50 Hp fan machine. So a calculation is needed to find out the number of visitors who can enter in safe and comfortable conditions in the hole. Air quantity and quality are parameters that must be known to determine the number of visitors who can enter the hole, air quantity consists of hole area data and wind speed, while air quality consists of gas content data, wet temperature, dry temperature and relative humidity. The evaluation results obtained the maximum number that can enter in safe and comfortable conditions, namely fan machine A is 25 people, fan machine B is 30 people, and fan machine 2 x 50 Hp is 100 people.
Slope Stability Analysis of Low Wall Pit 6 at PT Sarolangun Bara Prima, Mandiangin District, Sarolangun Regency, Jambi Gary Aprio; Yoszi Mingsi Anaperta; Bambang Heriyadi; Heri Prabowo
Journals Mining Engineering : Bina Tambang Vol 9, No 2 (2024): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v9i1s.127895

Abstract

PT Sarolangun Bara Prima is a company engaged in the coal mining industry located in Mandiangin sub-district, Sarolangun district, Jambi city. PT Sarolangun Bara Prima is one of the coal mining companies that uses open mining system with open-cut method. This research focuses on the Low Wall pit 6 slope of PT Sarolangun Bara Prima. from the results of field observations, the authors found water seepage and avalanches on the walls of the Low Wall pit 6 slope. The high rainfall at PT Sarolangun Bara Prima causes a decrease in the cohesion value and the value of the inner shear angle in the slope constituent material. The method used in analyzing the stability of the Low Wall Pit 6 slope is the Morgenstern-Price method which is run into slide 6.0 software. The analysis was carried out based on the actual slope section data in August 2023. from the results of the analysis of the stability of the Low Wall Pit 6 slope obtained a safety factor (FK) with a saturated state of 1.089 From the results of the analysis obtained, it explains that the Low Wall Pit 6 slope is in a keritis state. For this reason, the authors made modifications to the actual slope geometry to get FK ≥ 1.3 or the slope is said to be safe. The results of the modification of the geometry of the Low Wall pit 6 slope obtained FK value for saturated conditions is 1.30.
Evaluasi Geometri Jalan Gaharu Pit B Rawa Selatan PT Mandala Karya Prima Site Karrasi, Kecamatan Sembakung, Kabupaten Nunukan, Provinsi Kalimantan Utara Fadhlur Rohman; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 10, No 1 (2025): Journals Mining Engineering: Bina Tambang (On Progress)
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v9i3.130250

Abstract

PT Mandala Karya Prima merupakan perusahaan jasa pertambangan batubara yang berlokasi di Kecamatan Sembakung, Kabupaten Nunukan, Provinsi Kalimantan Utara. Salah satu pit yang ada di PT Mandala Karya Prima adalah Pit B Rawa Selatan di Jalan Gaharu yang berfungsi untuk pengangkutan overburden. PT Mandala Karya Prima menerapkan sistem penambangan terbuka. Namun salah satu kekurangannya adalah ketika hujan turun, semua kegiatan penambangan harus dihentikan, jika tetap dilanjutkan menyebabkan jalan menjadi licin dan berisiko longsor (sliding). Jalan Gaharu merupakan jalan yang tergolong baru, sehingga masih banyak kekurangan pada jalan tersebut terutama dari segi geometri jalan, misalnya kemiringan melintang yang tidak sesuai dengan nilai ideal yaitu 2-4%, lebar jalan yang belum ideal dimana memiliki lebar kurang dari 25 meter dengan nilai ideal 25 meter, superelevasi yang belum sesuai, dan grade jalan yang melebihi 8%. Berdasarkan pengukuran menggunakan software Arcgis 10.8 yang dilengkapi dengan peta ortho dan peta kontur, panjang jalan yang digunakan adalah 1,4 km. Lebar jalan lurus dari total 27 ruas, 26 ruas memiliki lebar jalan yang ideal untuk dilalui Komatsu HD 785-5 dan yang tidak ideal berada pada titik 26. Lebar jalan tikungan dari total 6 ruas, 3 ruas yang ideal dan 3 ruas yang tidak ideal yaitu pada titik 30, 31, 32 yang tidak dapat dilalui Komatsu HD 785-5. Superelevasi ideal pada jalan tersebut adalah 4% atau 1,098 m. Namun, dua tikungan tidak memiliki superelevasi yang sesuai. Kelandaian jalan yang ideal berdasarkan persyaratan perusahaan adalah 8%. Namun, kondisi aktualnya ada satu segmen yang tidak memiliki nilai grade jalan yang ideal, yaitu pada segmen 2.
Analisis Kestabilan Lubang Bukaan Pada Lubang D-12 Tambang Bawah Tanah Batubara Berdasarkan Metode RMR-System PT. Dasrat Sarana Arang Sejati, Parambahan, Kecamatan Talawi, Kota Sawahlunto, Sumatera Barat Berryl Hannah; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 8, No 3 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i3.126029

Abstract

This study aims to determine the rock mass class, support strength value, opening hole safety factor and support safety factor, as well as safe support recommendations based on rock class and support dimensions. Since the point in underground mining problems is usually related to the selection of supports and all underground mining activities are carried out by making openings, the opening holes are made by maintaining their stability to be safe for workers and mining equipment to be used and to ensure the safety of workers and the economic value of their use. In identifying the characteristics of the rock mass in an opening hole can be done by several methods. One of them is the geomechanical method (Rock Mass Rating System). This method will produce a rock mass class, rock strength, potential collapse, opening hole stability and get recommendations for a suitable support system based on the results of RMR ground support, and get the condition of the wooden support used. From the results of the analysis there are several parameters of the RMR method that have been carried out, in the D-12 Tunnel B hole for coal is in class III (fair rock) with an RMR of 59 with a Stand Up Time of 83 Days with a maximum width or length of 5 m without the help of support. And for silstone is in class II (good rock) with RMR of 64 and Stand Up Time is 354 days with a maximum width or length of 5 m without support. The value of the wood support safety factor is known, the actual FK cap has a value of 1.322 and the actual FK side post is 5.586, where the FK cap does not meet the safe requirements set out in KEPMEN 1827K/30 / MEM / 2018. Then after evaluating the support distance, the FK cap is obtained to be 1.5. Based on the safety factor, the recommendation for a good and safe buffer system for the company to use is with a wood diameter of 15 cm and a buffer distance of 1.61 m.
Co-Authors Abdullah, MT, Dr. Rijal Adree Octova Ahmad Ridho Permana Akman Syarif Al Anhar Hardianto Aldo Surya Pratama Alfi Rahman Andi Asmunandar Andre Gustian Anita Sari Sundriya Annisa Hanim D Annisa Oktavianingsih Ansosry Ansosry Aprilian Susanto Argi Saputra Ari Ardila Ari Febrianda Bafnis Ariq Jibran Azhary Rahim Bagas Maulana Hasan Berryl Hannah Carles Trisis Caniago Dasri Husien Dewi Suryani Dhoni Syaputra Diky Canima Fadhlur Rohman febri yanda praja Febrian Syukra Febylina Valencia Agustina Rumwaropen Fedi Fedi Fuzi Atiiqah Gary Aprio Gestio Sesar Yulindo Heri Prabowo Ilep Prengki Insani Sabilillah Jeremyes A.P Jualifa Pradisti Gayatri Jukepsa Andas Jukepsa Andas M Adli Fikri Muhammad Abbil Raihan Muhammad Deno Akbar Muhammad Fadillah Muhammad Irawan Multavich Multavich Mulya Gusman Murad Murad Naufal Deya Al Mafaza Mufti Nopi Kohirozi Noval Satria Novita Tria Putri Oktaviana Saputri Panji Kurnia Wiradani Rahmat Zulmy Refky Adi Nata Reno Putra Riki Rinaldo Riri Ferdian Rizaldi Rizaldi Rizka Sestiana Rizki Aldi Saputra Rizki Putri Bungo Rully Septian Sahmijar Sahmijar Sumarya Sumarya Suryadi Putra Syakinah Hasibuan Syarif Hidayattullah Teddi Triandana Tiwi Melisa Wahyu Eko Prasetianto Wahyu Kurniawan Wahyu Marta Novri Wahyudi Saputra Wuni Aprila Yolanda Noverista Yoszi Mingsi Anaperta Yudi Andrian Yunasril Yunasril Zet Rahmadanil Zhilal Darma