摘要
岩体崩塌是我国高山峡谷内常见的地质灾害,由于失稳机制极其复杂且难以预测和把控,给灾害防治造成了极大困难。本文基于离散单元法(Discrete element method,DEM),预测和分析了川西某隧道出口上部危岩崩塌体的运动过程和影响,数值模拟结果表明:1)该危岩体失稳大约8 s后撞击到隧洞上部的挡板,危岩体结构发生破坏,整个运动过程以滚动为主,总的持续时间大约15 s;2)不同重量的危岩体运动速度相差不大,速度变化趋势基本相同,最大速度介于32~34 m/s之间,速度峰值出现在6~8 s之间;3)危岩崩塌体初始质量越大,滚动到挡板时的撞击力越强,出现动能峰值的时刻也越早。相关研究成果可为该隧洞口的地灾防治工程设计提供一定的理论依据。
Rock mass collapse is a common geological hazard in alpine canyons in China. The instability mechanism is extremely complex and difficult to predict and control,thus great difficulties for disaster prevention and control are caused. The movement process and influence of dangerous rock collapse at the upper exit of a tunnel in Western Sichuan is predicted and analyzed based on DEM. The numerical simulation results show that:1)the dangerous rock mass hits the upper baffle of the tunnel after it has lost stability for about 8 seconds,the structure of dangerous rock mass is destroyed,and the main movement process is rolling,with a total duration of about 15 seconds;2)the velocity of dangerous rock mass with different weights has little difference,and the change trend is basically the same. The maximum average velocity is between 32 and 34 m/s,and the peak velocity is between 6 and 8 seconds;3)the larger the initial mass of dangerous rock collapse mass,the stronger the impact force when rolling to the baffle,and the earlier the peak of kinetic energy appears. Relevant research results can provide a theoretical basis for the design of geo-hazard prevention and control engineering at the tunnel entrance.
作者
赵川
麻泽龙
蒋琳琳
罗思敏
张少雄
Zhao Chuan;Ma Zelong;Jiang Linlin;Luo Simin;Zhang Shaoxiong(Sichuan Academy of Water Conservancy,Chengdu 610072,Sichuan;Ren'ai College,Tianjin University,Tianjin 301636;Shijiazhuang Tiedao University,Shijiazhuang 050043,Hebei)
出处
《工程建设》
2020年第7期1-6,共6页
Engineering Construction
基金
四川省基础科研费资助项目(20191090633018)
四川省水利厅2018年度科研项目计划(川水科2018015号)。
关键词
地质灾害
危岩崩塌
隧道口
动能
DEM
geologic hazard
collapse of dangerous rock
tunnel entrance
kinetic energy
DEM
