基于改进切线角理论的十堰市变质岩滑坡预警阈值研究  

Research on early warning thresholds for metamorphic landslides in Shiyan City based on improved tangential angle theory

作　　者：朱智超 曾斌[1] 何文武 于义军 梅红专 ZHU Zhichao;ZENG Bin;HE Wenwu;YU Yijun;MEI Hongzhuan(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430074,China;Yejin Geological Team of Hubei Geological Bureau,Shiyan 442000,China)

机构地区：[1]中国地质大学(武汉)环境学院,湖北武汉430074 [2]湖北省地质局冶金地质勘探大队,湖北十堰442000

出　　处：《自然灾害学报》2024年第3期167-177,共11页Journal of Natural Disasters

基　　金：湖北省地质局冶金地质勘探大队科技项目(YJDKY2022-01)。

摘　　要：十堰市地形地貌复杂,地层岩性多变,变质岩广泛分布,区内滑坡灾害多发。为减轻滑坡灾害带来的严重危害,实现滑坡灾害的准确预警,基于改进切线角理论,结合累积加速度及累积加加速度,选取十堰市4个已发生破坏的变质岩滑坡地表位移监测数据。通过绘制其T-t曲线、累积加速度-时间曲线、累积加加速度-时间曲线,分析得到了十堰市变质岩滑坡蠕滑阶段的综合划分结果。确定临滑预警阈值判据为:T-t曲线切线角大于等于80°、累积加速度大于0,并且增长保持较大正值、累积加加速度大于0,且连续增长或保持高值。研究成果对十堰市变质岩滑坡的监测预警工作具有重要意义,同时也可为其他类型滑坡的监测预警阈值研究提供参考。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.

关 键 词：滑坡 改进切线角 变质岩 预警阈值 变形速率 

分 类 号：P642.22[天文地球—工程地质学] X43[天文地球—地质矿产勘探]