Safety Analysis of Pre-mining Water Control in Coal Mine Working Face Based on FLAC3D
Take the West third mining area of Qianyingzi Coal Mine as an example,FLAC3D software is used to simulate the failure characteristics of overhanging rock caving zone and water-conducting fracture zone after min-ing.The predicted height of water-conducting fracture zone is 43.45,45.60,45.40 m.The height of the collapse band is respectively 14.23 m,12.78 m,13.32 m.The predicted coal pillar height of sand control is 26.23,24.78,25.32 m,which is lower than the actual coal pillar height of 44 m.The caving zone of overlying strata on the roof will not affect the"four contains"during the mining face.The measured height of caving zone after mining is 12.13 m,and the height of water-conducting fracture zone is 40.19 m,both of which are smaller than the distance between the predicted value and the actual coal pillar.It is proved that W3233 working face has the condition of retaining fortified sand coal column under the premise of good prediction and early warning.
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