Research On Monitoring And Early Warning Of Highway Geohazards In High Altitude Rainy Mountainous Area Based On InSAR Technology

Since the 13 th Five-Year Plan,China's highway construction has gradually extended to high altitude rainy mountainous area where geological hazards are frequent.Therefore,it is of great significance to study the monitoring and early warning of high altitude rainy mountainous highway geohazards.However,the research on the optimization of monitoring technology and early warning evaluation of high altitude rainy mountainous highway geohazards is still insufficient at home and abroad,and there is a lack of research on the whole process information management of monitoring and early warning,which is difficult to meet the comprehensive needs of highway geohazards monitoring and early warning.This paper takes highway geohazards in high altitude rainy mountainous area as the research object,and conducts research on deformation monitoring and early warning evaluation,so as to realize the construction of comprehensive early warning evaluation system and monitoring-warning information system for highway geohazards.The main research contents and conclusions are as follows:(1)Design of In SAR monitoring scheme in high altitude rainy mountainous area: Based on the summary and classification of the influencing factors of highway geohazards in special areas,and combined with the analysis of In SAR monitoring principles and advantages,we have completed the In SAR monitoring scheme design for geohazards in high altitude rainy mountainous area,including the determination of monitoring objects,methods and indicators.(2)Using improved D-In SAR and PS-In SAR technologies to monitor and analyze the deformation of highway geohazards,and evaluating the accuracy of the monitoring results:Based on the optimization of the technical parameters and processes of D-In SAR and PSIn SAR,we have applied the two In SAR technologies to monitor the surface deformation of the monitoring area and each monitoring point,and obtained D-In SAR monthly surface deformation results and PS-In SAR quarterly deformation vector results in the study area.It is found that the deformation trends of geohazards in high altitude rainy mountainous area present seasonal patterns.The accuracy of the monitoring results is evaluated by using three evaluation indexes: median error value,correlation coefficient and T test.The results show that the median error value of the two sets of monitoring data is less than 15 mm,the correlation coefficient is more than 80%,and there is no significant difference between the two results.(3)Establishing the comprehensive early warning evaluation model of highway geohazards: Based on gray relational analysis,the sensitivity sequence of each influencing factor of highway geohazards is obtained,so as to establish the hierarchical model of "factor layer?criterion layer?target layer" for early warning evaluation,and to realize the quantitative classification of each evaluation index.The fuzzy analytic hierarchy process is used to construct the early warning evaluation model of highway geohazards,which determines the early warning status of each geohazard monitoring point and verifies its accuracy by subsequent monitoring and inspection results.According to the temporal and spatial distribution of highway geohazards,we have obtained a dynamic and comprehensive early warning evaluation system for highway geohazards in high altitude rainy mountainous area.(4)Constructing of highway geohazards monitoring and early warning information system:According to the analysis of geohazards monitoring and early warning requirements,the overall functional architecture of the system has been designed.Using Microsoft SQL Server data management system to build information database and establishing a structured entry process for complex information on highway geohazards.Through the Python and the low-code design platform to develop the functional structure of system,four major subsystems have been designed respectively include the monitoring and inspection management system,the multitype data monitoring system,the big data analysis and early warning system and the monitoring-warning construction system.Finally,the whole process management of highway geohazards monitoring and warning information has been achieved.