Prediction of water-conducting fracture zone based on key layer theory
The height of water-conducting fracture zone is a key to the prevention and control of mine water disaster.In order to calculate the height of water-conducting fracture zone under the conditions of thick coal seam mining,the height of water-conducting fracture zone in a working face of Northern Shaanxi coalfield is calculated based on the key layer theory.The re-sults show that the key layer of the working face is mainly sandy mudstone and fine sandstone.The thickness of the key layer is 23.42～24.21 m,which is relatively the thickest of all rock layers.The yellow and red soil-based soft rock layer plays a certain role in restraining the development of the water-conducting fracture zone.Based on the key layer theory,the maxi-mum height of the water-conducting fracture zone is determined as 136.9 m,which is very close to the measured height of the water-conducting fracture zone with an error of only 6.08％.This result can help to accurately identify the source of mine filling water.
Northern Shaanxi coalfieldkey layerwater-conducting fracture zone heightsoft rock
万方数据
维普
