摘要
合理控制临空面可以获得较好的爆破效果,软弱、破碎地质围岩的洞室內缩及坍塌变形一般朝临空面方向发生,且变形幅度与坍塌风险均随临空面的增大而增大.以兰渝铁路LYS-2标隧道实际施工控制为例,分析了临空面在隧道施工中正反两方面的作用,从控制临空面角度阐述了防止隧道变形的措施.
The reasonable control of free surface can get better blasting results.The surrounding rock particularly weak,broken geological rock cave interior deformation and collapse shrinking oc-cur to the free surface direction and amplitude of deformation and the security risk increases with the free surface increases.In this paper,the actual construction control standard of Lan Yu Rail-way LYS-2 tunnel as an example,analyzes the positive and adverse effects of the free face in tun-nel construction and from the perspective of the free surface control measures to prevent the de-formation of the tunnel.
出处
《兰州交通大学学报》
CAS
2014年第1期19-22,共4页
Journal of Lanzhou Jiaotong University
关键词
临空面
隧道工程
应用与控制
free surface
tunneling engineering
application and control
