花山岭隧道进出口落石特征及防治研究  

Research on Rockfall Characteristics at Entrance of Huashanling Tunnel and Its Prevention and Control

作　　者：任玉鹏 REN Yupeng(Yinchuan Construction Directorate,China Railway Lanzhou Group Co.,Ltd.,Yinchuan Ningxia 750000,China)

机构地区：[1]中国铁路兰州局集团有限公司银川工程建设指挥部,宁夏银川750000

出　　处：《铁路技术创新》2022年第5期12-15,共4页Railway Technical Innovation

摘　　要：基于中兰铁路(宁夏段)的危岩落石现场调查情况,以花山岭隧道进口为例,利用赤平投影法对危岩落石的整体稳定性进行评估,通过Rockfall软件研究不同落石轨迹预测线下危岩落石的运动轨迹、动能、弹跳高度、落点位置等运动特征,并针对花山岭隧道进口提出安全合理的防治措施,确保铁路工程结构和运营安全。研究结果表明:局部岩体存在脱离母体向线路大里程方向及左侧冲沟滚落与崩塌的可能。落石在边坡上部发生滚落运动中产生的最大弹跳高度为3.9 m,最大冲击能量约为130 kJ,大部分落石落点位于洞口附近,对隧道洞口及线路运营产生一定的干扰。研究提出一种在洞口处衔接护桥棚洞的防治方法,可以有效保护隧道洞口及铁路线路,为其他类似项目提供参考。Based on the on-site investigation of rockfall of Zhongwei-Lanzhou Railway(Ningxia Section),taking the entrance of Huashanling Tunnel as an example,the overall stability of dangerous rockfall is evaluated by stereographic projection method,and the movement trajectory,kinetic energy,bounce height,falling point position and other characteristics of dangerous rockfall under different trajectory prediction lines are studied by rockfall software.In addition,safe and reasonable prevention and control measures are proposed to ensure the safety of railway engineering structure and operation.The research results show that the local rock mass may fall and collapse in the direction of large mileage of the railway line and the gully on the left side.The maximum bounce height generated by rockfall in the rolling movement at the upper part of the slope is 3.9 m,and the maximum impact energy is about 130 kJ.Most of the falling points of rockfall are located near the portal,which generates certain interference with the tunnel portal and line operation.This paper proposes a prevention and control method to connect the shed tunnel of bridge-type rockfall protection structure at the portal,which can effectively protect the tunnel portal and the railway line,and provide references for other similar projects.

关 键 词：花山岭隧道 危岩落石 防治措施 护桥棚洞 

分 类 号：U457[建筑科学—桥梁与隧道工程]