雪峰山公路隧道围岩类别动态变化分析及治理措施

Analysis and disposal of the dynamic changes in the grades of surrounding rocks in Xuefeng Mountain Highway Tunnel

高速公路隧道施工过程中,无论是采用弹性波波速还是隶属函数法进行分类,围岩均可归为Ⅳ、Ⅴ类。然而,由于施工方法不当、支护强度不足或支护不及时等原因,会造成围岩类别的降低。文章分析了这种围岩类别动态变化的成因,提出了识别围岩类别变化处的地质体特征及治理措施。此技术运用于高速公路雪峰山隧道施工中,有效地预防了这类围岩类别变化的灾害发生,有益于隧道的安全施工。

Surrounding rocks are usually classified as grade Ⅳ or Ⅴ depending on the elastic wave velocities or ambiguity function method adopted during highway tunnel construction. However, the grades are lowered because of incorrect construction, insufficient support strength or delay in supporting. This paper discusses the causes of the dynamic changes in grades, points out how to identify the geo -mass characteristics, and how to adopt disposal measures in advance. By applying this technique in Xuefeng Mountain Highway Tunnel, the catastrophe of dynamic changes in the grades of surrounding rocks was prevented effectively which favored the tunnel construction.