Application Study Of GNSS Technique In Monitoring Of High Slope Of Huaixin Expressway

The instability of high slope of cutting can be caused by more rainfall in Hunan.In the operation of expressways,the traffic and safety of expressways can be seriously affected by the collapse of high slope of cutting.However,limited by the construction monitoring environment,it is inconvenient and time-consuming to adopt traditional methods to monitor the high slope during the operation period.Therefore,the research on the information monitoring technique of high slope of expressways cutting was carried out during a certain operation period.The relevant work and conclusions are as follows:(1)The risk evaluation work was carried out through a detailed understanding of the K1469+545-K1469+745 slope of Huaixin Expressway,including current situation,topography,hydrogeology and other aspects.Changes and causes in risk levels were analyzed and the risk level of this slope was determined(2)Advantages of GNSS technique in slope monitoring were analyzed.Based on the characteristics of K1469+545-K1469+745 slope of Huaixin Expressway,the slope monitoring plan was formulated and the control points of various components installed on the project site were summarized.(3)The relationship between slope stability coefficient and displacement change was established by adopting the strength reduction method and the ABAQUS finite element software.The early warning threshold of displacement classification was determined accordingly and a corresponding early warning mechanism was formulated.Combined with the measured data,the current deformation stage and stability of the slope were analyzed and evaluated.(4)The slope monitoring and early warning system was developed by adopting the SQL server database technique.The system consists of data slope information module,monitoring data module,rainfall collection module,system authority management module and system early warning module.Functions were provided for the slope,including position information,deformation trend information,monitoring data and early warning information.The functions of querying,displaying,managing and early warning of slope data were achieved,which provided a good platform for relevant staff.