The Application Of CORS RTK Level Measurement In Mining Subsidence

During the mining process, rock strata and ground will move often, which will threat residents personal and property safety on the surface of mining, so the strata and ground movement monitoring and predicting caused by the mining process is very important. In the actual work, we obtain the elevation of monitoring points through level measurement connecting with level based points of mining area in different period, and then monitored and predicted.However, level measurement not only workload, low work efficiency, but also causes the error transfer, in the practical application it is time-consuming and effort. In recent years, with the gradual development and improvement of GNSS technology, and the rapid development of computer technology and other relating disciplines, CORS RTK technology become more and more mature and stable,which provides the possibilities that CORS-RTK level measurement instead of level measurement.This technology has been widely applied in all kinds of engineering measurement.However,the RTK technology has many insufficiencies in the positioning precision of leveling, mainly due to the quasi geoid is an irregular surface,so we need fit it with a curved surface precision of rules, so that we can fit a high precision geodetic height obtained by RTK technology to Orthometric height or normal height we need in our real.This paper draws a final conclusion mainly by using comparative analysis method.We are based on the actual situation of measurement area and the design of the ground surface movement observation station in Gu Bei Mine.And combining with the RTK measurement and elevation fitting theory,we analysis the known data gathered by level measurement and CORS-RTK technology,and compare the Geodetic height difference with the level difference or the normal height difference after elevation fitting with the level difference, through comprehensive analysis,and finally we draw a conclusion that it will have a batter effect that we replace level difference with the difference after fitted in Gu Bei MineoMeasuring the elevation by RTK technology, not only high efficiency, and without visibility to different point position, but also each point be measured independently,so the error will not be transferred. If we can use CORS-RTK leveling instead of level measurement, not only can we save manpower and material resources greatly, but also we can monitor the mining area in real-time, which is very important and necessary to analysis and estimate the changes of surface rock in mining area.