高速铁路深埋黄土隧道变形模式及锚杆作用机理研究

以郑西铁路客运专线函谷关隧道工程为依托，通过理论分析和现场1：1原型试验相结合，综合分析确定高速铁路大断面深埋黄土隧道围岩内变形模式以及基于此变形模式的锚杆作用机理和作用效果。研究结果表明：拱顶部围岩内位移衰减缓慢，不同深度处围岩相对位移值很小，出现整体下沉现象；边墙部围岩位移衰减较快，不同距离处围岩相对位移值较大；围岩内不同部位变形模式是影响锚杆受力的关键性因素，拱部锚杆受力很小，边墙锚杆受力较大；建议隧道拱部130°范围内可不设置锚杆，该范围以下至墙角设置全长粘结型系统锚杆。研究结果有效地指导了现场设计与施工，同时也为类似工程提供参考依据。

Study on Deformation Model of Deep-buried High-speed Railway Tunnels in Loess Stratum and Working Mechanisms of Bolts

Taking Hanguguan tunnel on Zhengzhou-Xi'an passenger-dedicated railway as an example,the authors synthetically analyze and determine the deformation model of the surrounding ground of deep-buried large cross-section tunnels in loess stratum,as well as the working mechanisms of the bolts of these tunnels based on the deformation model,by theoretic analysis and in-situ prototype test.The study results are as follows: For the surrounding ground at the arch,the attenuation of the displacement is slow,the relati...