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ANALISIS STABILITAS LERENG AREA TIMBUNAN MENGGUNAKAN METODA KESETIMBANGAN BATAS PADA TAMBANG TERBUKA BATUBARA DAERAH PURWAJAYA, KECAMATAN LOA JANAN, KABUPATEN KUTAI KARTANEGARA Andriani, Tati; Zakaria, Zufialdi; Muslim, Dicky; Oscar, Agus Wiramsya
Buletin Sumber Daya Geologi Vol 12, No 3 (2017): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Abstract

Salah satu prinsip pada penambangan terbuka (open pit mine) batubara adalah menggali tanah atau batuan penutup (overburden) untuk mendapatkan batubara, sehingga dibutuhkan tempat penimbunan untuk menampung overburden, yang disebut sebagai disposal area. Salah satu permasalahan pada disposal area adalah kondisi lereng yang tidak stabil sehingga terjadinya longsoran-longsoran yang dapat mengganggu jalannya operasi tambang seperti terhambatnya alat berat pengangkut material tambang. Agar disposal area tetap berada dalam kondisi stabil maka perlu adanya kajian geoteknik yang membahas mengenai kestabilan lereng, sehingga operasi tambang dapat berjalan dengan baik. Penelitian ini dilakukan untuk mengetahui kestabilan lereng disposal area pada tambang batubara di Purwajaya, Kecamatan Loa Janan, Kabupaten Kutai Kartanegara. Penelitian dilakukan dengan pengambilan data lapangan berupa geometri lereng serta karakteristik material pada disposal area. Kemudian dilakukan simulasi lereng untuk mendapat nilai FS (Safety-Factor) yang diperkirakan masih aman menggunakan metode kesetimbangan batas dengan bantuan aplikasi Slide Versi 6. Ketebalan timbunan saat ini sudah mencapai 20 meter, dengan sudut lereng keseluruhan adalah 9°.Hasil perhitungan nilai FS dari tiga sayatan menunjukkan, bahwa disposal area berada dalam kondisi belum aman dengan nilai FS pada setiap sayatan adalah 1,108; 1,21 dan 1,756. Parameter nilai FS yang dianggap aman adalah lebih besar dari 1,25. Untuk mendapatkan nilai FS optimum hasil dari simulasi untuk lereng keseluruhan, maka geometri lereng yang disarankan adalah tebal timbunan maksimum 20 meter dan sudut lereng optimal 9°, dengan dibuat undakan-undakan tinggi 7 meter dan sudut 30° pada lereng. Hasil simulasi ini memiliki nilai FS 1,301 pada kondisi jenuh. 
Koreksi Smr Pada Desain Lereng Tambangterbuka Batubara Pada Formasi Balikpapan & Formasi Kampungbaru, Sangasanga,Kalimantan Timur Zakaria, Zufialdi; Muslim, Dicky
Buletin Sumber Daya Geologi Vol 7, No 3 (2012): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Abstract

Kajian desain lereng stabil dibutuhkan dalam eksploitasi tambang batubara, khususnya dalam sistem tambang terbuka. Penambangan memerlukan desain lereng dengan berbagai cara. Untuk menemukan lereng stabil secara cepat, digunakan pembobotan massa lereng (SMR, Slope Mass Rating) yang berdasarkan kepada pembobotan massa batuan (RMR, Rock Mass Rating). Pada titik lokasi yang longsor maupun rawan longsor, diperlukan kajian khusus mengenai kestabilan lereng dengan metode lain dan menggunakan perangkat lain. Pada formasi batuan yang mengandung lapisan material urai (loose) seperti pasir kuarsa pada Formasi Balikpapan maupun Formasi Kampungbaru di Sangasanga, Kalimantan Timur, penentuan pembobotan massa lereng perlu dikoreksi untuk menemukan sudut lereng yang paling aman. Meskipun pada akhirnya, pilihan penentuan sudut lereng yang aman, akan bergantung pula kepada aspek ekonomis dalam penambangan. Hasil koreksi SMR yang melibatkan nilai SMR berdasarkan peneliti terdahulu (Laubscher, Romana, Orr dan Hall) didapatkan rumus-persamaan, yaitu: 1) SMR = 68,22 ln(RMR) - 225,5 (untuk persamaan logaritmik); 2) SMR = 1,262RMR - 22,30 (untuk persamaan linier); 3) 0,082 RMR 1,580 (untuk persamaan power); dan 4) SMR = 9,191e0,029RMR (untuk persamaan eksponensial).
KARAKTERISTIK FISIK DAN MEKANIK TANAH MENGANDUNG MINERAL TIMAH DI DAERAH LAUT PAYAKUNDUR, PROVINSI KEPULAUAN RIAU Khoirullah, Nur; Sophian, Irvan; Muslim, Dicky; Arma, Yadvi
Buletin Sumber Daya Geologi Vol 10, No 1 (2015): Buletin Sumber Daya Geologi
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Abstract

Sifat fisik dan mekanik material (batuan ataupun tanah) merupakan sifat penting dalam memahami kekuatan dan karakteristik material. Daerah penelitian terletak pada Laut Payakundur dikenal sebagai Tin Belt of Sumatera yang kaya akan kandungan timah. Penelitian ini bertujuan untuk mengetahuikarakteristik fisik dan mekanik tanah yang dapat menunjang data pemboran geologi. Metode yang digunakan dalam penelitian ini merupakan penelitian lapangan melalui uji penetrasi standar dan sampel yang terambil diuji di laboratorium guna mendapatkan nilai sifat fisiknya. Karakteristik tanah yang ditemukan diklasifikasikan ke dalam USCS menjadi tanah CL, CH, SC, danSW. Nilai kadar air berkisar dari 13-80%. Nilai berat jenis berkisar dari 2,53-2,74. Nilai berat isi berkisar dari 14,7 sampai 21,5 KN/m 3 . Nilai N-SPT lapangan dikoreksi menjadi 70 % energi standar. Karakteristik sifat fisik tanah lokasi penelitian banyak dipengaruhi oleh air, sehingga menyebabkannilai kadar air yang cukup tinggi terutama pada tanah lempung. Pada satuan SW terdapat mineral cassiterite dan didominasi oleh bentuk butiran yang subangular yang diinterpretasikan tertransportasi dekat dari sumbernya. Korelasi dari nilai N-SPT dapat mengetahui nilai mekanika tanahnya namun ujilaboratorium untuk mekanika tanah tetap diperlukan 
KARAKTERISTIK DAN KUALITAS POTENSI ANDESIT DI DAERAH KECAMATAN SOREANG DAN SEKITARNYA, KABUPATEN BANDUNG, PROVINSI JAWA BARAT Darana, Arif R; Muslim, Dicky
Buletin Sumber Daya Geologi Vol 10, No 2 (2015): Buletin Sumber Daya Geologi
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Abstract

Komoditas mineral non-logam merupakan salah satu sumberdaya alam yang berharga. Salah satu yang menjadi komoditi ini ialah batuan beku andesit. Komoditas tersebut terdapat di Bandung bagian selatan yang tepatnya berada di daerah Kecamatan Soreang, Kabupaten Bandung, Jawa Barat. Untuk mengetahui bagaimana karakteristik dan kualitas potensi tersebut maka dilakukanlah penelitian yang menggunakan tiga metode, yaitu: 1. Metoda lapangan untuk memetakan keadaan geologi daerah tersebut dan mengambil sampel, 2. Metoda laboratorium, untuk menganalisis sampel secara petrografis, 3. Metoda studio untuk menyusun hasil analisis lapangan dan laboratorium. Hasil yang didapatkan ialah pada daerah penelitian terdapat satuan batuan yang terdiri dari: Satuan Breksi Vulkanik Monomik (Tmbvm), Satuan Lava Andesit Porfiri (Tmla), Satuan Intrusi Andesit Porfiri (Tppa), Satuan Breksi Vulkanik (Tpbv), Endapan piroklastik (Kv) dan Aluvium (Ka). Potensi Andesit Porfiri initerdapat pada satuan Tppa, yang terbagi dalam tiga kelas kekuatan batuan, yaitu very strong, strong, dan weak. Varietas kualitas ini diakibatkan adanya pelapukan yang melibatkan interaksi antara faktor-faktor fisika dan kimia, dalam membentuk kekar-kekar untuk menjadi jalan air sebagai proses perubahan mineral utama menjadi mineral lempung,sehinga membuat diferensiasi kualitas batuan Andesit Porfiri.
DISTRIBUSI KUAT GESER BATUAN PADA FORMASI MUARAENIM YANG MENGANDUNG BATUBARA DI KECAMATAN MERAPI BARAT, KABUPATEN LAHAT, PROVINSI SUMATERA SELATAN Hamid, Nur; Hendarmawan, Hendarmawan; Muslim, Dicky; Ruchjana, Budi Nurani
Buletin Sumber Daya Geologi Vol 11, No 3 (2016): Buletin Sumber Daya Geologi
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Abstract

Masalah kemantapan lereng sering ditemukan dalam operasi penambangan terutama pada dinding penggalian tambangnya. Kegiatan produksi akan terganggu apabila lereng-lereng yang terbentuk sebagai akibat dari proses penambangan  tidak stabil. Suatu tambang terbuka belum tentu memiliki besar sudut kemiringan lereng yang sama, hal ini diantaranya akibat dari kuat geser batuan (τ) yang merupakan indeks kualitas batuan, semakin kecil kuat geser batuan maka semakin lemah kekuatan batuan dalam menyangga beban dan akan menjadi bidang lemah yang mudah longsor. Dalam penelitian ini digunakan metode pemetaan geologi dan analisis gama ray dari 43 lubang bor. Metode Kriging digunakan untuk mengetahui distribusi kuat geser batuan di daerah penelitian. Hasil analisis metode Kriging memperlihatkan distribusi kuat geser batuan yang mempunyai nilai rendah yaitu 200 ton/m2 mengarah ke selatan semakin menyempit dan secara vertikal distribusinya semakin dalam semakin berkurang.
Characteristics of Arun Carbonate Reservoir and Its Implication To Optimize the Most Potential Gas Resource Zone In Arun Gas Field, Aceh, Indonesia Atmadibrata, Riza; Muslim, Dicky; Hirnawan, R. Febri; Abdurrokhim, Abdurrokhim
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7210.225 KB) | DOI: 10.17014/ijog.6.2.209-222

Abstract

DOI:10.17014/ijog.6.2.209-222Since the discovery of major oil and gas reserves in carbonate rocks in the Middle East, carbonate reservoirs became important to the petroleum industry. Carbonate rocks have covered only 20% of the sedimentary rock records. However, carbonate reservoirs hold 50% of the world petroleum reserves. Arun Carbonate Reservoir is one of the biggest proven retrograde gas reservoirs in the world. After more than thirty years of production, Arun Carbonate Reservoir had an initial gas in place of 14.1 TCF residual hydrocarbon gas. The issue makes Arun Carbonate Reservoir became an interest to be studied for the development and production of hydrocarbon in other carbonate reservoirs in Indonesia. One of the fundamental topics to be studied is the characteristics of Arun Carbonate Reservoir itself. The characteristics of carbonate reservoir usually cause a lot of geologic and engineering problems in the development and production of hydrocarbon reserves. This paper aims to identify the characteristics of Arun Carbonate Reservoir and its implication to delineate the potential gas resource zone in the Arun Gas Field, Aceh, Indonesia. The data from sixteen wells have been examined through several multidiscipline studies: geophysics (well logging), geology (facies, lithology and diagenetic analyses), and petrophysics (core analysis). The result of this study shows that Arun Carbonate Reservoir (N5-N8) contains limestone 92%, 5% dolomite, and 3% dolomitic limestone (or other), and petrophysically have 16% porosity and 13.5 md permeability in average. Arun Carbonate Reservoir is divided into four facies (Reef, Near Reef, Inter Reef Lagoon, and Middle Shelf). Of four facies in Arun Carbonate Reservoir, only two facies which can be categorized as productive facies: Reef and Lagoonal Facies. The potential zones of hydrocarbon resources have vertically been documented in Arun Carbonate Reservoir.
Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia Yudhicara, Yudhicara; Muslim, Dicky; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol 4, No 3 (2017)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3397.501 KB) | DOI: 10.17014/ijog.4.3.193-208

Abstract

DOI: 10.17014/ijog.4.3.193-208The study discusses about characteristics of Sumatra Fault and its tectonic activity in Liwa and the adjacent area. The research uses quantitative methods of verification hypothetical deduction, which starts from the general approach, then it pursues into more specialized and focused ones. While the research work includes field measurements, remote sensing with GIS, and geomorphologic analysis using morphometry, such as: sinousity of mountain front (Smf), percentage of facets, ratio of the width and height of the valley (Vf), bifurcation ratios of the river (Rb), drainage density (Dd), shape of the watershed basin area (Bs), hypsometric curves (HI), and gradient index of stream length (SL). Basically, two blocks separated by the Sumatra Fault do not have a significant difference in tectonic activity, but the tectonic activity change can be seen when the studied area is divided into three blocks (northwest, middle, and southeast), then the change in each part can clearly be seen. Apparently, the tectonic activity in the studied area starts from the southeast continues toward the northwest. It is proved by this research, that geomorphological parameters which are associated with mountain fronts and watershed systems demonstrate the value of the activity increases towards the northwest. Hypsometric curves and a river analysis show that the tectonic activity in the northwest is relatively in a young stage, while towards the southeast it is getting in a mature stage.
Characteristics of Arun Carbonate Reservoir and Its Implication To Optimize the Most Potential Gas Resource Zone In Arun Gas Field, Aceh, Indonesia Atmadibrata, Riza; Muslim, Dicky; Hirnawan, R. Febri; Abdurrokhim, Abdurrokhim
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7210.225 KB) | DOI: 10.17014/ijog.6.2.209-222

Abstract

DOI:10.17014/ijog.6.2.209-222Since the discovery of major oil and gas reserves in carbonate rocks in the Middle East, carbonate reservoirs became important to the petroleum industry. Carbonate rocks have covered only 20% of the sedimentary rock records. However, carbonate reservoirs hold 50% of the world petroleum reserves. Arun Carbonate Reservoir is one of the biggest proven retrograde gas reservoirs in the world. After more than thirty years of production, Arun Carbonate Reservoir had an initial gas in place of 14.1 TCF residual hydrocarbon gas. The issue makes Arun Carbonate Reservoir became an interest to be studied for the development and production of hydrocarbon in other carbonate reservoirs in Indonesia. One of the fundamental topics to be studied is the characteristics of Arun Carbonate Reservoir itself. The characteristics of carbonate reservoir usually cause a lot of geologic and engineering problems in the development and production of hydrocarbon reserves. This paper aims to identify the characteristics of Arun Carbonate Reservoir and its implication to delineate the potential gas resource zone in the Arun Gas Field, Aceh, Indonesia. The data from sixteen wells have been examined through several multidiscipline studies: geophysics (well logging), geology (facies, lithology and diagenetic analyses), and petrophysics (core analysis). The result of this study shows that Arun Carbonate Reservoir (N5-N8) contains limestone 92%, 5% dolomite, and 3% dolomitic limestone (or other), and petrophysically have 16% porosity and 13.5 md permeability in average. Arun Carbonate Reservoir is divided into four facies (Reef, Near Reef, Inter Reef Lagoon, and Middle Shelf). Of four facies in Arun Carbonate Reservoir, only two facies which can be categorized as productive facies: Reef and Lagoonal Facies. The potential zones of hydrocarbon resources have vertically been documented in Arun Carbonate Reservoir.
Comparative Study among Bivariate Statistical Models in Landslide Susceptibility Map Arifianti, Yukni; Pamela, Pamela; Agustin, Fitriani; Muslim, Dicky
Indonesian Journal on Geoscience Vol 7, No 1 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2497.054 KB) | DOI: 10.17014/ijog.7.1.51-63

Abstract

DOI:10.17014/ijog.7.1.51-63The main purpose of this paper is to compare the performance of bivariate statistical models i.e. Frequency Ratio, Weight of Evidence, and Information Value for landslide susceptibility assessment. These models were applied in Cianjur Regency, West Java Province (Indonesia), in order to map the landslide susceptibility and to rate the importance of landslide causal factors. In the first stage, a landslide inventory map and the input layers of the landslide conditioning factors were prepared in the Geographic Information System (GIS) supported by field investigations and remote sensing data. The 298 landslides were randomly divided into two groups of modeling/training data (70%) and validation/test data sets (30%). The landslide conditioning factors considered for the studied area were slope angle, elevation, slope aspect, lithological unit, and land use. Subsequently, the thematic data layers of conditioning factors were integrated by frequency ratio (FR), weight of evidence (WofeE), and information value (IV). Model performance was tested with receiver operator characteristic analysis. The validation findings revealed that the three models showed promising results since the models gave good accuracy values. The success rates of FR, WofE, and IV models were 0.920, 0.926, and 0.930, while the prediction rates of the three models were 0.913, 0.912, and 0.895, respectively. However, the FR model was proved to be relatively superior in estimating landslide susceptibility throughout the studied area.
Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia Yudhicara, Yudhicara; Muslim, Dicky; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol 4, No 3 (2017)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.4.3.193-208

Abstract

DOI: 10.17014/ijog.4.3.193-208The study discusses about characteristics of Sumatra Fault and its tectonic activity in Liwa and the adjacent area. The research uses quantitative methods of verification hypothetical deduction, which starts from the general approach, then it pursues into more specialized and focused ones. While the research work includes field measurements, remote sensing with GIS, and geomorphologic analysis using morphometry, such as: sinousity of mountain front (Smf), percentage of facets, ratio of the width and height of the valley (Vf), bifurcation ratios of the river (Rb), drainage density (Dd), shape of the watershed basin area (Bs), hypsometric curves (HI), and gradient index of stream length (SL). Basically, two blocks separated by the Sumatra Fault do not have a significant difference in tectonic activity, but the tectonic activity change can be seen when the studied area is divided into three blocks (northwest, middle, and southeast), then the change in each part can clearly be seen. Apparently, the tectonic activity in the studied area starts from the southeast continues toward the northwest. It is proved by this research, that geomorphological parameters which are associated with mountain fronts and watershed systems demonstrate the value of the activity increases towards the northwest. Hypsometric curves and a river analysis show that the tectonic activity in the northwest is relatively in a young stage, while towards the southeast it is getting in a mature stage.
Co-Authors Abdurrokhim ⠀ Achmad Djumarma Wirakusumah Adi Hardiyanto Adithya Ramadhani Hasibuan Aditya Dwi Prasetio Adiwijaya, Annisa Ayungingtyas Pratiwi Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat - Adjat Sudradjat -, Adjat Sudradjat Adjat Sudrajat Adriansyah, Yan Afiah, Mahda Agung Mulyo Agus Didit Haryanto Agus W Oscar Agus Wiramsya Oscar Agustin, Fitriani Alamta Singaribun Alamta Singarimbun Alamta Singarimbun -, Alamta Singarimbun Algi Fajar Ghaniansah, Algi Fajar Alifahmi Alifahmi, Alifahmi Andra Taufiq Andriani, Tati Andriani, Tati Anggoro Tri Mursito Anggoro Tri Mursito Anhar, Jevye Fazrin Kusumah Arif R Darana Arif R. Darana Arifianti, Yukni Arma, Yadvi Arma, Yadvi Asdani Soehaimi Atang, . Athanasius Cipta Atmadibrata, Riza Atmadibrata, Riza Azizi, Hisyam Azhar Bambang Sugiarto Bombom Rachmat Suganda Budi Nurani Ruchjana Cipta Endyana Cyrke A N Bujung Danny H. Natawidjaja Darana, Arif R Darana, Arif R Destirani, Sagita - Dewi Gentana Dewi Ulfa Astriani Donny R. Wahyudi Edy Soesanto Eko Tri Sumarnadi Emi Sukiyah Emy Sukiyah Endayana, Cipta Euis Tintin Yuningsih Evi Haerani -, Evi Haerani Fachrudin, Kurnia Arfiansyah Fahira, Ghina Faiq Nirmala Faisal Akbar Nasution Faisal Helmi Faisal Helmi Fauzan, Aldo Febri Hirnawan Febri Hirnawan Febri Hirnawan - Febri Hirnawan -, Febri Hirnawan Firmansyah, M. Nizar Fitriani Agustin Fiverno, David Feby Galih W. Swana Hananto Kurnio Hanif, Salma Nur Hendarmawan Hendarmawan Hendarmawan Hendarmawan, Hendarmawan Heri Nurohman Heriwaseso, Anjar Heryadi Rachmat Hirnawan, R. Febri Hirnawan, R. Febri Ildrem Syafri Imanuel Seru Irvan Sophian Irvan Sophian Irvan Sophian, Irvan Iskandarsyah, Teuku Yan W. M. Ismawan Iyan Haryanto Jakah Jakah Jakah Jakah Jakah, Jakah Johanes Hutabarat Johanes Hutabarat Jossi Erwindi Juniarto, Reinaldi Kamawan Kamawan Khaerani, Puspa Khaerani, Puspa Khoirullah, Nur Khoirullah, Nur Kristiawan, Yohandi Luthfan H. Jihadi, Luthfan H. M. Dwiki Satrio Manullang, Sahala Maret Priyanta Marjiyono Marjiyono Marjiyono Mega Fatimah Rosana Mega Fatimah Rosana Moh. Sapari Dwi Hadian Mudrik R. Daryono Muhamad Ridwan Muhammad Burhannudinnur Muhammad S. Sadewo Mursito, Anggoro Nadhirah Seraphine Nadhirah Seraphine Nana Sulaksana Nana Sulaksana Nana Sulaksana Nendi rohaendi Nur Hamid NUR HAMID Nur Khoirullah Nurdrajat Nurdrajat Nurida Maulidia Rahma Oscar, Agus W Oscar, Agus W Pamela Pamela Pamela, Pamela Pradnya Paramarta Raditya Rendra Prantoko, Edi Puspa Khaerani Putra, Rieza Rachmat Putri, Yunitha R.I. Putri, Yunitha R.I. R. Febri Hirnawan Raden Irvan Sophian -, Raden Irvan Sophian Raden Irvan Sophian, Raden Irvan Reza Mohammad Ganjar Gani Risna Widyaningrum Riza Atmadibrata Robby Setianegara Rukmana, Yanwar Yusup Ryan Hidayat Selasian Gussyak Seraphine, Nadhirah Seru, Imanuel Seru, Imanuel Sofyan Rachman Idris Sondi Kuswaryan Sonia Fauziah Sonny Aribowo Sudjono, Evie Hadrijantie Sudradjat, Adjat Sukardan Tawil Sumarnadi, Eko Sumaryono Sumaryono Sumaryono Sumaryono Suyono, Oon Swana, Galih W. Swana, Galih W. Tati Andriani Taufiq Wira Buana, Taufiq Wira Taufiq, Andra Taufiq, Andra Teuku Y.W.M Iskandarsyah Tulus Pramudyo Ujang Hidayat Tanuwiria Verdad Chabibullah Abdallah Iman Vijaya Isnaniawardhani Wahyuzi, Radhi Wandani, Diki Waromi, Doodle Dandy Wicaksana, Kintan Adelia Arum Widia Hadiasti, Widia Widyaningrum, Risna Yadvi Arma Yanwar Yusup Rukmana Yanwar Yusup Rukmana Yosep, Boy Yudhicara Yudhicara Yudhicara, Yudhicara Yudhicara, Yudhicara Yudi Kuswandi Yudistira Purnamaruslia Yukni Arifianti Yunitha R.I. Putri Yunus Winoto Zakaria, Zulfiadi Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria Zufialdi Zakaria -, Zufialdi Zakaria Zufialdi Zakaria, Zufialdi Zulfialdi Zakaria, Zulfialdi