Detection of loosen zone of drift surrounding rock by portable geological radar

Based on the portable radar detection technology and sound wave test technology, the thickness distribution of loosen zone of drift surrounding rock in Ashele copper mine is studied at different levels and different mining stage.The results show that the thickness of loosen zone can be determined quickly and accurately by Sub Surface Profiler (SSP) radar.Its results are highly consistent with the thickness of loosen zone detected by sound wave test.The thickness of loosen zone at the -200 m level in the Ashele copper mine ranges from 1.6 m to 1.9 m, which is obviously greater than that at the 50 m level before mining disturbance.Mining disturbance has a significant impact on the thickness of loosen zone.Before mining, thickness of loosen zone at the 50 m level is about 1.4-1.7 m, while it is about 1.6-2.0 m at last.The research results are of great significance to optimize the support parameters according to thickness of loosen zone.