摘要
崩塌落石作为山区高陡边坡的一种典型破坏方式,是危害严重的地质灾害之一。基于禹门口隧道进口危岩的现场调查,以W10危岩体为例,利用RocFall软件,模拟了4种坡面覆盖情况下危岩崩塌后的运动轨迹,对比分析了落石在隧道进口部位的冲击能量、弹跳高度等运动学参数的差异。利用PFC 3D软件重建三维地表模拟了W10危岩体崩落后的三维运动轨迹。结果表明:植被覆盖情况直接决定恢复系数的大小,而恢复系数越大,能量转化效率越高,落石动能损失越小;坡形是决定落石弹跳高度的控制性因素,落石崩落后在地形凸起处发生弹跳,4种坡面条件下落石弹跳高度最大处基本一致;PFC 3D较RocFall能更全面地展示出落石崩落后形态及运动轨迹,对落石的防治工作有很好的指导意义。
As a typical failure mode of high and steep slopes in mountainous areas,rock collapse is one of the serious geological hazards.Based on field investigation of dangerous rock at entrance of Yumenkou Tunnel,taking W10 dangerous rock as an example,RocFall software was used to simulate movement track of dangerous rock after collapse under four kinds of slope coverage conditions,and the differences of impact energy and jump height of rockfall at entrance of tunnel were compared and analyzed.PFC 3D software was used to reconstruct the three-dimensional surface and rock fall model,and the three-dimensional trajectory of W10 dangerous rock mass after collapse was simulated.The results showed that:vegetation coverage directly determined the size of recovery coefficient,and the greater the recovery coefficient,the higher the energy conversion efficiency,the smaller the kinetic energy loss of rockfall.Slope shape was the controlling factor to determine the bounce height of falling rocks.The bounce occurred at topographic protrusion after falling rocks.The maximum bounce height of falling rocks was basically the same under the four slope conditions.Compared with RocFall,PFC 3D can display shape and trajectory of rockfall more comprehensively,which has a good guiding significance for prevention and control of rockfall.
作者
万天同
王忠福
黄金瑞
Wan Tiantong;Wang Zhongfu;Huang Jinrui(North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Zhengzhou University,Zhengzhou 450001,China)
出处
《能源与环保》
2020年第1期75-80,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
作者简介
万天同(1995-),男,河南邓州人,硕士研究生,研究方向为地质灾害防治。
