浅埋偏压高铁隧道围岩变形及控制研究

Study on Deformation and Control of Surrounding Rock of Shallow-Buried Bias High Speed Railway Tunnel

为防止浅埋偏压高铁隧道围岩发生大变形或坍塌事故,文中结合郑万高铁湖北段楚烽隧道施工实例,对浅埋偏压高铁隧道围岩的变形特性及控制进行研究。结果表明,围岩变形量与时间响应曲线表现为先增加后平稳再次增加最后趋于平稳的状态,最大的围岩变形量达到27 mm;围岩的变形速率与掌子面距离呈现先快速下降后增加再次下降的趋势;通过相关的变形控制措施处理后,变形值均满足规范要求,证实了变形控制措施的可靠性,施工效果良好。

In order to prevent large deformation or collapse of surrounding rock of shallow buried bias high-speed railway tunnel,this paper studies the deformation characteristics and control of surrounding rock of shallow buried bias high-speed railway tunnel based on the construction practice of Chufeng tunnel in Hubei section of Zhengwan high-speed Railway.The results show that the time response curve of surrounding rock deformation increases at first,then steadily increases again and finally becomes stable,and the maximum deformation of surrounding rock reaches 27 mm.The deformation rate of the surrounding rock and the distance between the face of the palm show a trend of rapid decline at first,then increase and then decrease again.After the deformation control measures are processed,the deformation values meet the requirements of the specification,which proves the reliability of the deformation control measures and the construction effect is good.