摘要
北京地区崩塌隐患多发,崩塌是北京最常见的一种地质灾害,但崩塌监测预警工作仍处于起步阶段。琉辛路(密云段)监测路段崩塌多发,根据崩塌发育特征及仪器安装条件共布设1台雨量站,1台预警警示装置,10台崩塌监测仪,监测结果表明:降雨主要集中在每年7、8月份;D4-D5-D7、D10为拉裂-倾倒式崩塌,位移呈现缓慢移动,变形量17~77mm,曲线表现为平滑状;D3-D9-D11、D2为拉裂-坠落式崩塌,位移变化呈现突然移动,变形量0.6~16mm,曲线表现为阶梯状。崩塌监测预警指标选取位移量、位移加速度和降雨量3项指标,以位移-时间绘制变形曲线,以切向角、裂缝宏观特征、加速度为判据判定预警级别,并做出应急响应。
Collapse hazards occur frequently in Beijing,which is one of the most common geological disasters in Beijing,but the collapse monitoring and early warning work is still in the initial stage.The monitoring section of Liuxin Road(Miyun section)is prone to collapse.According to the development characteristics of the collapse and the installation conditions of the instrument,a rain measuring station,an early warning device and 10 collapse monitoring devices have been set up.The monitoring results show that the rainfall is mainly concentrated in July and August of each year.D4-D5-D7 and D10 are split-dumping collapses,with a slow displacement,a deformation of 17-77mm and a smooth curve.D3-D9-D11 and D2 are tensile-falling collapses,with a sudden movement,a deformation of 0.6-16mm and a stepped curve.On the analysis of the collapse of the forming conditions and the existing monitoring project,at present,three indicators of collapse monitoring and early warning in Beijing are selected:displacement,displacement acceleration and rainfall,i.e.,drawing deformation curve with displacement and time,determining warning level with tangential angle,macroscopic characteristics of cracks and acceleration as criteria,and making emergency response.
作者
韩建超
HAN Jianchao(Beijing Institute of Geology,Beijing 100120)
出处
《城市地质》
2020年第2期148-153,共6页
Urban Geology
基金
北京市突发地质灾害监测预警系统(一期)工程项目(京发改[2013]2593号)。
关键词
崩塌
监测预警
切向角
危岩变形
应急响应
北京
Collapse hazard
Monitoring and early warning
Tangential angle
Dangerous rock deformation
Emergency response
Beijing
