摘要
京张铁路明挖隧道由于进洞开挖后长期处于浅埋偏压地段,导致明挖隧道结构受力不均,制约了整个施工进程。通过研究该明挖隧道结构受力状态,得出其受力状态计算理论模型,判断隧道结构受力状态。通过在拱部径向注浆保证注浆管埋设牢固;通过设置临时支撑使隧道两侧的钢架单元与临时支撑形成稳定的三角支撑体系;利用初期支护侵限处理完成换拱,将垂直度偏差控制为–2°~2°;通过监控隧道结构受力状态变化数据,保证了施工顺利进行。
The open cut tunnel along Beijing-Zhangjiakou railway is in a shallow buried and biased area for a long time after excavation,which causes uneven stress of the tunnel structure and restricts the whole construction process.Based on study on the stress state of open cut tunnel structure of Beijing-Zhangjiakou railway,the theoretical model for stress state calculation was obtained,and relevant stress state of tunnel structure was determined.Radial grouting at the arch part ensured the burying stability of the grouting pipe;By setting temporary supports,the steel frame units on both sides of the tunnel and the temporary supports could form a stable triangular support system.Arch change was completed by the initial support intrusion treatment,and the perpendicularity deviation was controlled within-2°to 2°.The changing data of the stress state of the tunnel structure was monitored to guarantee smooth construction.
作者
赵映昱
ZHAO Ying-yu(China Railway 18th Bureau Group Fourth Engineering Co.Ltd.,300350,Tianjin,China)
出处
《建筑技术》
2021年第11期1341-1343,共3页
Architecture Technology
关键词
京张铁路
明挖隧道
结构受力状态
Beijing-Zhangjiakou railway
open cut tunnel
structure stress state
