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All Journal Buletin Sumber Daya Geologi Jurnal Geominerba
Suwandhi, Awang
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Earth & Planetary Sciences Education Energy Engineering Environmental Science Other

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GETARAN TANAH AKIBAT PELEDAKAN PADA JARAK AMAN KURANG DARI 300 METER TERHADAP MANUSIA DAN BANGUNAN DI KUARI BATUGAMPING PT LEBAK ENERGI NUSANTARA BAYAH KABUPATEN LEBAK PROVINSI BANTEN Adinugraha, Wanda; Suwandhi, Awang; Marmer, Dwihandoyo; Hadiyat, Yudiana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 8 No 2 (2023): Jurnal Geominerba - 2023
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v8i2.144

Abstract

The limestone quarry managed by PT Lebak Energi Nusantara (PT LEN) is located at Bayah, Lebak regency, Banten province. Blasting techniques are used to break limestone from its rock mass. In connection with the progress of mining which is getting closer to public facilities, a technical study of the impact of blasting is needed. Mining progress is a critical issue because the impact of blasting vibrations can affect the stability of buildings and disturb residents around the quarry. The buildings around the blasting are classified as class 3 because most of them have foundations made of stone, brick masonry made of cement mortar which is then bound by reinforced concrete. According to SNI 7571:2010, this building quality has a maximum blasting vibration threshold value of 5 mm/s. The relationship curve between blasting vibrations or peak particle velocity (PPV) and the distance scale (SD) was successfully developed from the results of analysis of 30 blasting data. Based on this curve, it is predicted that the maximum total of explosives recommended to be safe at a distance of less than 300 m and at blasting vibration maximum 5 mm/s is 78.47 kg/delay.
ANALISIS JARAK PELEDAKAN KUARI ANDESIT TERHADAP REL KERETA API CEPAT DI CV PANGHEGAR PLERED PURWAKARTA JAWA BARAT Adinugraha, Wanda; Suwandhi, Awang; Marmer, Dwihandoyo; Hartami, Pantjanita Novi; Ipmawati, Meda Rusdiana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.158

Abstract

CV Panghegar, operating in the villages of Cilalawi and Liunggunung, Sukatani and Plered sub-districts, Purwakarta Regency, West Java Province, is a quarry mining company that employs blasting activities to break andesite rock in its mining processes. Given the proximity of the high-speed railway tracks to the mining site, a technical assessment of the impact of blasting is necessary. The distance between the high-speed railway tracks and the mining site, being less than 300 meters, presents a critical issue as blasting vibrations or flyrock can damage the railway structure or pose a safety hazard to passing trains during blasting operations. The objectives of this study are to determine the safe ground vibration levels caused by blasting, the safe distance for flyrock, and the methods and technical references for safe blasting activities near high-speed railway tracks within 300 meters. The study approach includes field observations, measurements, and discussions with the company and other relevant parties. Based on the study results, it is concluded that the maximum vibration levels are below the standard vibration limits, with vibrations towards the tracks at distances of 58 meters and 60 meters reaching 13.61 mm/s and 15.86 mm/s, respectively. Meanwhile, the maximum vibration levels parallel to the tracks at distances of 56 meters and 62 meters reach 15.2 mm/s and 17.69 mm/s, respectively. The farthest flyrock distance is 20-30 meters (< 300 meters). Blasting operations with the current geometry and at a distance of 100 meters (< 300 meters) from the railway tracks can use a maximum ANFO explosive weight of 22.5 kg/delay (equivalent to 3 holes detonating simultaneously), 37.5 kg/delay (equivalent to 5 holes detonating simultaneously), or 52.5 kg/delay (equivalent to 7 holes detonating simultaneously), which are predicted to generate vibrations of 8.15 mm/s, 12.90 mm/s, and 17.47 mm/s, respectively.
KRITERIA KERUSAKAN AKIBAT PELEDAKAN PADA PEMBUATAN TEROWONGAN CIURUG, TAMBANG EMAS PONGKOR, KABUPATEN BOGOR, PROVINSI JAWA BARAT Suwandhi, Awang; Rosana, Mega Fatimah; Sudradjat, Adjat; Wattimena, Ridho Kresna
Buletin Sumber Daya Geologi Vol 12 No 2 (2017): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v12i2.36

Abstract

Untuk mencapai urat (vein) bijih di lokasi Central pada Level 500 mdpl, Ciurug, dibuat terowongan baru yang dinamakan RU4C-L500 dengan menerapkan teknik peledakan. Terowongan tersebut dirancang berukuran lebar 4 m, tinggi 4 m dan panjang 100 m sampai ke cross-cut menuju urat bijih. Penelitian dilakukan dengan tujuan untuk mendapatkan kriteria kerusakan terowongan yang diakibatkan oleh induksi getaran peledakan yang berpotensi menghasilkan overbreak, sehingga ukuran terowongan menjadi lebih lebar dari rencana semula. Pendekatan Blast Damage Index (BDI) digunakan sebagai metode untuk memperoleh tingkat kerusakan terowongan tersebut. Terowongan menerobos batuan andesit vulkanik yang berdasarkan hasil pengujian memiliki kecepatan rambat gelombang seismik 4157 m/det, densitas 2,37 g/cc dan kuat tarik 8,10 MPa. Batuan tersebut tergolong batuan berkekuatan sedang hingga keras dengan nilai Rock Mass Rating (RMR) antara 58,3 sampai 69,5. Data getaran peledakan diukur dengan menggunakan geofon pada jarak yang aman dari titik ledakan dan menghasilkan Peak Vector Sum (PVS) berkisar antara 2 mm/s sampai 120 mm/s. Hasil pengolahan data getaran menunjukkan, bahwa nilai BDI sebesar 2 yang mengidentifikasi adanya ambrukan terowongan karena induksi getaran peledakan terjadi pada jarak kurang dari 3 m dari titik ledakan. Besar getaran peledakan yang mengambrukan batuan andesit vulkanik tersebut mencapai PVS 1170 mm/s. Pada jarak antara 3,0 m sampai 10 m tidak terjadi kerusakan terowongan yang parah dan dapat direhabilitasi. Kondisi tersebut diidentifikasi oleh nilai BDI 0,5 sampai 1. Kemudian pada jarak di atas 10 m induksi getaran peledakan tidak lagi berpengaruh terhadap kerusakan atau kestabilan dinding terowongan. 
Co-Authors Adinugraha, Wanda Adjat Sudradjat Hadiyat, Yudiana Hartami, Pantjanita Novi Ipmawati, Meda Rusdiana Marmer, Dwihandoyo Mega Fatimah Rosana Ridho Kresna Wattimena, Ridho Kresna