山区铁路危岩落石运动特征及防治研究

Study on Motion Characteristics and Controlling of Rockfall in Mountainous Railway

以燕山中山区某高陡边坡危岩落石地段铁路路基为依托,根据危岩落石发育特征及现场调查资料,运用ROCKFALL软件建立高陡边坡落石运动分析模型,系统研究落石运动特征;揭示落石弹跳和冲击特性;预测落石运动轨迹和落点分布规律,统计分析出陡坡上约7.5%的危岩体失稳后将侵入路基,在此基础上提出了在陡崖顶部设置1道张口式帘式网的防治设计方案。

Based on the railway subgrade of the high steep slope along dangerous rockfall section in Zhongshan District of Yan Mountainous,depending on the development characteristics of the rockfall and the field investigation data,the model analyzing the motion of falling rocks at high steep slope was established with ROCKFALL software,whereby the motion characteristics of rockfall was studied systematically.Furthermore,the bounce and impact characteristics of falling rocks were revealed,and the motion trail of the falling rocks and the distribution law of the points of fall were predicted.It was found out by statistical analysis that,on steep slope,there may have 7.5% of dangerous rocks intrude into the subgrade if unstable.On this basis,the control scheme to set an opening curtain net at the top of steep cliff was proposed.