TY - THES

T1 - Fault detection with Ground Penetrating Radar and Crosshole Radar for subsurface mining safety

AU - Kulich, Jakob

N1 - embargoed until 02-05-2024

PY - 2019

Y1 - 2019

N2 - We apply Ground Penetrating Radar (GPR) and Cross-Borehole Ground Penetrating Radar (XBGPR) in an underground marble mine for fault detection and for a better understanding of the local stress regime. Fault detection is an ongoing safety issue in the mining industry, especially in underground situations. Detailed information about faults and fractures reducing rock stability have crucial impact on further mining activities. If faults are water filled, they can be detected by GPR. Boreholes are often drilled in advance of mining to clarify the locations of ore bodies and gangues. They can be used for cross borehole analyses and computed tomographic images can supplement conventional borehole imaging. For the acquisition of the XBGPR we have drilled 4 boreholes along a profile with increasing offset from 5 to 25 meters. The acquisition was performed with a 100 Hz antenna using a transmitter and receiver step size from 0.5 - 1 meter. The computed tomographic images were created until a depth of up to 30 meters and are complemented by the GPR measurements in reflection mode. GPR imaging was performed along the 25-meter-long profile with 100 Hz and 250 Hz antennas. We discuss the tomographic images of the XBGPR in combination with the GPR results for a better understanding of rock stability influencing mining activities.

AB - We apply Ground Penetrating Radar (GPR) and Cross-Borehole Ground Penetrating Radar (XBGPR) in an underground marble mine for fault detection and for a better understanding of the local stress regime. Fault detection is an ongoing safety issue in the mining industry, especially in underground situations. Detailed information about faults and fractures reducing rock stability have crucial impact on further mining activities. If faults are water filled, they can be detected by GPR. Boreholes are often drilled in advance of mining to clarify the locations of ore bodies and gangues. They can be used for cross borehole analyses and computed tomographic images can supplement conventional borehole imaging. For the acquisition of the XBGPR we have drilled 4 boreholes along a profile with increasing offset from 5 to 25 meters. The acquisition was performed with a 100 Hz antenna using a transmitter and receiver step size from 0.5 - 1 meter. The computed tomographic images were created until a depth of up to 30 meters and are complemented by the GPR measurements in reflection mode. GPR imaging was performed along the 25-meter-long profile with 100 Hz and 250 Hz antennas. We discuss the tomographic images of the XBGPR in combination with the GPR results for a better understanding of rock stability influencing mining activities.

KW - GPR

KW - Cross-Borehole GPR

KW - Störungsdetektion

KW - Untertagebau

KW - Ground Penetrating Radar

KW - Cross-Borehole Ground Penetrating Radar

KW - fault detection

M3 - Master's Thesis

ER -