Central Mining Institute Department of Geology and Geophysics

Central Mining Institute Department of Geology and Geophysics www. gig. eu COmplex Mining EXploitation - optimizing mine design and reducing the impact on human environment COMEX WP 1: Exploitation with overlying old shallow mines or open pit mines COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Task 1. 3: Field measurements at chosen sites and verification of developed methods. Geophysical measurements started in July 2013 and included: ü GPR measurements on selected profiles ü gravity survey in regular grid of points ü seismic refraction and MASW on selected profiles ü TEM soundings in points on selected profiles ü seismometric measurements of surface vibration ü underground mining seismic network ü subsidence measurements COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Bobrek Mine Karb district COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu deep coal exploitation in seam 503 COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu …and in seam 504 COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu The area for numerical modeling Bobrek Mine - Karb district COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu First stage of GPR - Ground-Penetrating Radar - survey COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Example of GPR profile on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Second stage of GPR survey COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Seismic survey on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu MASW profile no 1 refraction profile no 1 COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu MASW profile no 2 refraction profile no 2 COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu TEM – Transient Electromagnetic Method – survey on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Results of TEM surveys on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Gravity surveys on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Bouger anomaly map on Bobrek - Karb COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Monitoring of surface vibrations 7 surface stations within a distance of 4 km COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Underground seismic network 26 geophone stations (some of them 3 -components) COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Task 1. 1: Developing combined techniques to assess the effects of mine exploitation on overlying old shallow mines and in open pit mines. Within the confines of this task Geocontrol will make numerical modeling on the basis of the geological model All the information from geophysics surveys will be used for building the near-surface part of the model Deep geological building comes from archived data COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Map of subsidence on Bobrek - Karb The measured subsidence may be compared with modeling results COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Task 1. 2: Study of the influence of strong seismic events induced by mining on formation of sinkholes and cracks. In this task we will conduct numerical modelling with dynamic loads in Plaxis The recordings of surface vibrations will be added to the static model Model will include geological formations to the depth of old ore exploitation COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Draft version of shallow model on Bobrek - Karb Example of surface vibrations recording PGA [mm/s 2] COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu Example of total displacements calculated for Piaskowy shaft COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu vibrations added to model vibrations calculated on surface (blue) on building (red) COMEX meeting 23 -24 October 2013, Nottingham

Central Mining Institute Department of Geology and Geophysics www. gig. eu THANK YOU www. gig. eu COMEX meeting 23 -24 October 2013, Nottingham