Article Details

MONITORING OF BOREHOLE STABILITY AFTER BOREHOLE MINING OPERATION BY USING GROUND-PENETRATING-RADAR AND INDUCED POLARIZATION

Oleh   Wahyudi W. Parnadi [-]
Kontributor / Dosen Pembimbing : Mohamad N. Heriawan, Simon H. Prassetyo, Ichwan A. Lubis
Jenis Koleksi : Prosiding
Penerbit : Lain-lain
Fakultas :
Subjek :
Kata Kunci : GPR, IP
Sumber :
Staf Input/Edit : Devi Septia Nurul  
File : 4 file
Tanggal Input : 14 Mar 2022

Field investigation using Ground-Penetrating Radar (GPR) and Induced Polarization (IP) techniques has been conducted in Bangka Island to monitor the stability of borehole after Borehole Mining (BHM) operation. This BHM operation resulted a cavity forming in the borehole due to extraction of the alluvial tin layer. If the overburden over the extracted layer cannot hold the stability of the borehole, the cavity formed in the hole can reach the surface. Based on field observations, precisely in the Air Nudur Block (South Bangka Regency) and Air Gumuruh Block (West Bangka Regency), cavities that formed on the surface can occur within a span time of a few hours to several days after extraction of alluvial tin ore in the BHM hole is finished and the drill cased steel is removed. We deployed GPR system with 100 MHz shielded antenna before and after BHM mining operation and time domain IP system with 1.5 m electrode spacing conducted after BHM. Our research results show that both GPR and IP techniques supported with numerical modeling reveal an overburden slide and subsidence in the BHM bore