Research On The Application Of GNSS Technique In Geological Disaster Monitoring

Since the outbreak of the 5.12 Wenchuan earthquake, all kinds of secondary geological disasters occurred frequently in the disaster area , which has seriously affected the life and property safety of people. Therefore, all levels of government invested a lot of fund to govern geological disasters and is establishing warning system of monitoring and prevention of geological disaster.They carried out scientific ally monitoring wok of collapse,landslide,subsidence,debris flow and other geological disasters to grasp the characteristics of its birth and evolution, rules and can provide data for a reasonable evaluation of geological disasters and accurate warning.The main contents and achievements of this paper are as follows:First, By analyzing the methods such as horizontal displacement monitoring,settlement monitoring, digital photogrammetry monitoring and ground 3D deformation monitoring, this method has the problems of easy accumulation of errors, large influence of human factors and low operating efficiency. Therefore,this paper takes the unstable rock slope of Wujiayan in Tangba Village,Bailu Town,Pangzhou City,Sichuan Province as the experimental area, and uses GNSS technology to carry out the work of geological disaster monitoring.Second, from the design of geological disaster monitoring network, field data collection, data processing and so on, I static GNSS monitored unstable slopes in test area,And based on the HGO data processing software, the monitoring data is analyzed and processed, and the risk assessment is carried out, which verified that using GNSS technology for geological disaster monitoring can meet the accuracy requirements, and can improve the reliability of monitoring results.Third, the monitoring of geological hazard monitoring using static GNSS measurement technology has limitation of long observation period, complicated data processing and so on, it can not sensitively report geological disaster deformation conditions all the time and consumes human power greatly. The unstable slope is usually in stable state,but it will be out of stable state under certain external conditions and will cause landslide. Due to paroxysmal and unpredictability by the macro monitoring in naked eyes, there are more harm. So this paper uses GNSS deformation monitoring, SCCORS technology to explore the application and research of real-time processing,disaster factor analysis, disaster tendency analysis and other key technologies of SCCORS to high precision unstable slope deformation monitoring based on the GNSS monitoring data of SCCORS. The system design and integration provide a scientific basis for the possibility analysis and prediction of geological disasters.The results show that the unsteady slope of Wujiayan is stable at the present stage, and it is proved that the GNSS positioning technique can replace the conventional three-dimensional deformation analysis of the unsteady slope of the unstable slope by the GNSS static monitoring and real-time dynamic monitoring of Wujiayan unstable slope.Monitoring methods for monitoring geological hazards.