Analysis of Surface Movement Characteristic Observation under the Condition of Extremely Incompletely Mining in Deep Mine

For improving production efficiency of strip mining in deep mine and protecting surface and architectures better,observation is made to get surface movement data after mining a face in 25 Mining Area in 9th Colliery of Hebi Coal Group.The main surface movement characteristics under the condition of extremely incompletely mining can be concluded as follow: surface subsidence value is very small,but the maximum subsidence of completed mining is 10 times of this value.Movement range is similar to completed mining but subsidence basin is very gently.Inflexion of subsidence basin is near to coal,not to gob.Range of surface compression distortion extends to outside of gob.Time influence factors include that no active movement phase and advanced influence angle exist and start time of surface movement is delayed.These rules are adaptable for similar geological conditions and provide good suggestion for mining design under architectures,rivers and rail in deep mine.