Study on development law of water conducted zone in fully- mechanized mining face with 7m mining height

in order to studly the development law of the water conducted zone under the condtion of thefill- mechanized high cuting coal mining in the shallow depth seam of west China based on th full - mechanized mining face with 7 m mining height in No.5- 2 seam in Dlita Mine as the studly object a numerical sinulaton.theoretical acu ation nl ysis boreholefushing liquid lot value analysis dgital panorami: borehole imaging observation and other methods were applied.The resuts showed that the development heightof the water conducted zone was elated to the depostied structure type of the overburden strata,the width ofthe coal mining fa:e,the mnain key stratum location to the seam height and other factors and the variation of the coal mining face size woul affcted the water conducted zoneof the overurden strata.Meanwhile,under the condion of the ? m mining height when the length of the coal minin face was 147. 5 m,the develoment heght of the waterconducted zone was 68.76 m and would be 9.8 2 times of than the coal mining height.When the length of the coal mining face wa 301 mthe develogment height of the waterconducted zone was far over the theoretcal value.the heightof the fracture zone was 137.32 m and was 19.62 times of the mining height. Afitr the mining of No.5-2seam,the measured development height of the water conducted zone was 68.76 ×137.32 m and the fractured zone height and mining heigh ratio was 10.1~20.2.