Research On The Automatic Monitoring System For Coal Mining Subsidence

Aiming at the characteristics and the existing problems of the mining subsidence monitoring, combing the "Automatic Monitoring System Research on Surface Displacemen" project of Huainan Mining Group Co., Ltd., basing on GNSS CORS technology, network communication technology, mobile PDA technology, GNSS positioning technology, database technology, and through the system designing and framework constructing, key algorithm researching, system function defining, data management of standardizing, software implementing, project constructing, equipment developing, system testing and engineering application, etc.,The Automatic Monitoring System for Coal Mining Subsidence, hereinafter referred to as "CAutoMos", has been established successfully. CAutoMos realized the aims of rapid sampling, high precision calculating, processing automatically, managing and analyzing efficiently for the surface displacement and deformation information, and provided new Integrated monitoring technology and data analysis mode for mining subsidence monitoring. The main research works and achievementsare as follows.(1)The engineering foundation and the guiding ideology were laid on CAutoMos system research by establishing the monitoring network and building system overall framework. The CAutoMos system Monitoring network are composed of positioning base framework, 9 continuous operation real-time monitoring stations, 60 regular monitoring points. The overall framework are mainly composed of GNSS monitoring station subsystem, GNSS reference station subsystem, data monitoring center subsystem, real-time data acquisition terminal subsystem and communication subsystem.This CAutoMos architecture forms a integrated automation monitoring system set with the function of equipment monitoring, data acquisition, data transfer, data processing and analyzing, prediction and early warning,and is suitable for continuous real-time monitoring and CORS RTK monitoring.(2)According to the basic principle of VRS technology,and adopting the BDS/GPS double system integration technology, the key algorithms of CAutoMos system are built and provided the basic theory for the GNSS CORS system realization. The single epoch ambiguity fast calculating method with wide-lane ambiguity restriction is set up for network RTK reference station, and shorten the CORS RTK initialization time effectively.In order to realize the aim of calculating accurate two system ambiguity quickly, based on BeiDou three frequency constraint,the single epoch algorithm for BDS/GPS short baseline ambiguity is proposed.These two algorithms are verified by the measured data of study area, and provide a good theoretical basis and application prospect for solving the high precision and quick positioning problems for continuous operation monitoring stations and real-time data acquisition terminal system in CAutoMos system.(3)In order to improve the accuracy and reliability of spatial location series obtained by the real-time data acquisition terminal system using CORS RTK surveying model, kalman filtering algorithm for the CORS RTK surveying is established,and provides the technology security for sampling displacement and deformation information efficiently and quickly. The test results show that, using kalman filtering RTK measurement, the planar positioning accuracy is not more than ±2.5 mm, and completely meets the mining subsidence monitoring on the plane position measurement accuracy requirements.As for kalman filtering RTK measurement,comparing with the leveling, the height difference RMSE is about ±8.4 mm, and can basically satisfy the demands of mining subsidence monitoring of height measurement accuracy.(4)In order to solve the information management confusion problem,this paper Specifies the mining subsidence monitoring information management work. According to predetermined functions and targets of CAutoMos system, in order to realize the aim of managing the information by CAutoMos efficiently,and in order to carried on the beneficial exploration for specifying information management work on the mining subsidence monitoring and other engineering survey,the data structure of CAutoMos system are defined from the following aspects of properties data structure, graphic data management, the necessary information format of mobile terminal and continuous operation monitoring stations sent to the data processing center.(5)The software platform of automatic monitoring system for coal mining subsidence is researched and developed successfully.This software platform are composed of the three key softwares,such as data monitoring center software(hereinafter referred to as DMCS software), mining subsidence integrated data processing and analysis system software package(hereinafter referred to as MISPAS package), real-time data acquisition terminal system software(hereinafter referred to as CAutoTermS software),and is suitable for rapid sampling, high precision calculating, processing automatically, managing and analyzing efficiently for the displacement and deformation information. The operation result correctness and the predefined functions realizing the conformity degree of the software platform, are demonstrated from the aspects of system testing and system application.