High safety pillars stability control using EL beam displacement sensors in Lipica II quarryKortnik, Jože (Avtor) Nwaubani, Sunny (Avtor) Kos, Andrej (Avtor) , Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Lastnik avtorskih pravic) beam sensorhigh saftey pillarmonitoringnatural stoneroom and pillar mining methodIn underground Lipica II. quarry for the excavation of natural stone, a modified room-and-pillar mining method is used, that is adjusted to the conditions of the site. In order to support and ensure the stability of underground chambers high safety pillars (HSP) are used. These pillars are made of surrounding stone and therefore intersected by discontinuities. The discontinuities represent high risk to the stability of underground facilities and workmen below/ itself. To ensure their safety the stress and strain parameters in height safety pillars are continuously monitored using two vibrating wire (WV) stressmeters inside the high safety pillars and two EL (Electronic level) beam sensors on the surface of the high safety pillar VS3. In the time period October 2010/June 2012 absolute max. measured deviation with EL beam sensors were D1=0.9 mm and D2=1.1 mm, which does not compromise the stability of the high safety pillar VS3. This paper presents the procedures of wedges deformation monitoring in safety pillars with EL beam sensors in the Lipica II underground natural stone quarry.20142018-06-14 11:28:57Znanstveno delo70815ISSN: 1854-0171UDK: 622OceCobissID: 215987712COBISS_ID: 1138526ISSN pri članku: 1854-0171NUK URN: URN:SI:UM:DK:E7EXW310slFakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru