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提出了隧道大变形以及大变形隧道稳定性的概念。分析了产生大变形的机理和判断膨胀性围岩及挤压性围岩的参考标准 ;提出了大变形隧道极限位移状态的概念 ,即通过计算模拟确定大变形隧道的极限位移 ,利用隧道的实测位移和其极限位移判别大变形隧道的稳定性。以隧道周边位移为依据 ,建立大变形隧道稳定性判别准则 ,可以直观地与现场量测联系起来 ,真正体现隧道施工中的反馈信息、指导施工、修正设计的动态设计特点
The concept of large tunnel deformation and stability of large deformation tunnel is proposed. This paper analyzes the mechanism of large deformation and the reference standard for judging expansive surrounding rock and crushed surrounding rock. The concept of the limit displacement state of large deformation tunnel is put forward, that is, the limit displacement of large deformation tunnel is determined through calculation and simulation. DISCUSSION ON THE STABILITY OF A LARGE DEFORMATION TUNNEL BY DISPLACEMENT AND LIMIT DISPLACEMENT. Based on the displacement around the tunnel, the criteria for determining the stability of large deformation tunnels can be established, which can be directly linked with the field measurements to truly reflect the feedback information in tunnel construction, guide the construction and correct the dynamic design features of the design