摘要
初期支护沉降和收敛远远超过预留沉降量,先后采取了增加锁脚锚管、增加大拱脚、调整钢架间距、采用14轻型工字钢替代连接筋连接、增加预留变形量等措施均不能有效地控制隧道的异常变形。最后采取双层初期支护技术,有效地控制了隧道的异常变形。
The deformation of the initial timbering is unexpected and all the measures such as feet-lock bolt, large arch springing, double T-steel instead of dowel are not effective. Hence, the double-deck timbering is taken which puts the de-formation under effective control.
出处
《铁道建筑技术》
2014年第2期52-54,69,共4页
Railway Construction Technology
关键词
异常变形
双层支护
软岩隧道
abnormal deformation
double-deck timbering
weak rock
