Research on early warning thresholds for metamorphic landslides in Shiyan City based on improved tangential angle theory
The topography and geomorphology is complex,the lithology of the strata is varied and the metamorphic rocks are widespread distribution,which cause frequent landslide hazards in Shiyan City.In order to reduce the serious hazards caused by landslide hazards and achieve accurate early warning,the surface displacement monitoring(GNSS)data was selected from four metamorphic landslides that have been damaged in Shiyan City based on the improved tangential angle theory,combined with accumulate acceleration and accumulate accelerated acceleration.By drawing their T-t curves,accumulate acceleration-time curves and accumulate accelerated acceleration-time curves,the comprehensive classification of creep-slip stages of metamorphic landslides in Shiyan City were obtained.The following criteria were determined that the tangent angle of the T-t curvs was greater than or equal to 80°,the accumulate acceleration was greater than 0 and maintained a large positive value,and the accumulate accelerated acceleration was greater than 0 and continuously increased or maintained a high value.The results of the study are of great significance for the monitoring and warning of metamorphic landslides in Shiyan City,and can also provide reference for the monitoring and warning thresholds of other types of landslides.
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