Study on Anti- Deformation Technology of New Mine Shaft

In order to effectively reduce the coal quantity under the new mine shaft and to excavate the mine production potential, based on the new mine ventilatio n shaft and new mine air retuning shaft of No.4 Mine in Pingdingshan Tian'an Coal Mining Company Limited as the cases, the site experiment, numerical simulation calc ulation, theoretical study and other methods were applied to systematicly study on the anti-deformation technology of the new mine shaft and to establish the anti-defor mation technical system of the new mine shaft under the small protective coal pillar condition, including the completed planning, flexibility measures and rigid measure s.The rigid and flxibility combination would be applied to absorb and resist the movement and deformation of the rock strata.The practices showed that after the anti-d eformation technical measures conducted, the new mine shaft under the small coal pillar protection condition would have a max surface ground subsidence value of 24 9 mm near the mine shaft. There was no any failure occurred on the mine shaft, the mine shaft is in a normal safe operation and there was 15. 15 million t of coal liberat ed under the mine shaft.