Abstract: The monitoring precision of the surface mining subsidence monitoring method are low,and cannot to realize the goal of monitoring the mining subsidence in real time.In order to solve the problems,taking the vibrating string hydrostatic level as the sensor to establish the surface mining subsidence monitoring system with high precision of mining area by using GPRS (general packet radio service) wireless transmission technique as data transmission means.The basic structure of the system is analyzed,and its performance is tested in long time.The results show that the goal of surface mining subsidence monitoring in real time can be realized by using the system,stability features of the system is good.The system is used to monitor the surface mining subsidence of a coal mine in Shanxi Province for 9 days (from April 2,2017 to April 10,2017).The test results indicated that the maximum error between the monitoring results of the system and the corresponding precision leveling is 0.425 mm,which is superior to to GPS method with 5 mm monitoring precision.The above study results which further show that the monitoring precision of the system established in this paper is good,its practical value is ideal.

Key words: Mining subsidence, Vibrating string hydrostatic level, GPRS, Remote monitoring system, Precision leveling