Analysis and Technical Method of Linkage Survey Accuracy for Underground Mine Roadway

According to the high survey accuracy requirement,survey error accumulation and other features of the large mine roadway linkage project,in order to reduce the survey error and improve the linkage accuracy,taking the linkage survey of the +870 m level roadway in Jinhuagong Mine of Datong Coal Mine Group as a case,the paper discussed the necessity and feasibility to establish a surface special control net and to improve the underground conducted line survey accuracy.With the analysis on the survey data after the linkage,the main error sources affected to the mine roadway linkage accuracy and the method to reduce the error were obtained.The paper discussed the two projection correction error at the underground mine conducted line side affected to the linkage accuracy.The errors of the surface,mine shaft direction and underground conducted line affected to the had a total linkage error with a percentage of 1∶3∶4 obtained.The paper proposed that the gyroscope oriented side line and tripod method observation could be an effective method to improve the conducted line accuracy.When the two projection correction error was big and larger than 1/5 of the allow linkage error value,the two projection error should be corrected.The two projection correction error value was 750 mm in +870 m level roadway,thus it must be corrected.