昌景黄铁路边坡危岩落石运动特性及防治研究

Research on the Movement Characteristics and Prevention of Dangerous Rocks and Rockfall on the Slope of Changjinghuang Railway

以昌景黄铁路西武岭隧道进口和东山隧道进口边坡危岩落石地段为依托,根据现场调查资料及危岩落石发育特征,运用RocFall软件建立高陡边坡落石运动分析模型,系统研究了危岩落石的运动轨迹及特征,揭示了落石弹跳和冲击动能特性,预测了落石运动轨迹和落点分布规律。进一步地对西武岭隧道进口和东山隧道进口边坡危岩落石防护效果进行了验证分析。计算分析结果表明,由于边坡存在植被覆盖土,落石基本无法直接落入明洞。因此,提出了在混凝土护坡顶设置防护结构,并按时清理离明洞洞口较近的危岩落石等防治措施。

Based on the dangerous rock and rockfall sections at the entrance of Xiwuling Tunnel and Dongshan Tunnel on Changjinghuang Railway,and based on on-site investigation data and the development characteristics of dangerous rock and rockfall,this article uses RocFall software to establish a high steep slope rockfall motion analysis model.It systematically studied the movement trajectory and characteristics of dangerous rocks and rocks,revealed the characteristics of rock bounce and impact kinetic energy,and predicted the trajectory and distribution of falling points.It further verified and analyzed the protective effect of dangerous rock and rockfall on the slopes at the entrance of Xiwuling Tunnel and Dongshan Tunnel.The results indicate that due to the presence of vegetation covering soil on the slope,falling rocks are basically unable to directly fall into the open pit.Therefore,it is proposed to set up protective structures on the top of concrete slope protection and timely clean up dangerous rocks and falling rocks close to the open tunnel opening for prevention and control measures.