隧道围岩等级判别研究

为准确把握隧道围岩级别判定的方法,依据国家标准分析围岩级别划分的定性与定量方法,并提出一些可操作性建议,对公路隧道与铁路隧道围岩级别划分的差异进行对比,通过围岩级别判定指标的分析提出应将隧道开挖后的围岩稳定状态及隧道开挖后的各个施工阶段隧道围岩变形量纳入隧道围岩级别判定指标或作为BQ值的修正指标,这对隧道的设计和施工具有一定的指导意义。

In order to accurately ensure the method of determining the surrounding rock grade of tunnel,the qualitative and quantitative methods of surrounding rock grade classification are analyzed according to the national standard,and some operational suggestions are put forward.The differences of surrounding rock grade classification between highway tunnel and railway tunnel are compared.Based on the analysis of the judgment index of surrounding rock grade,it is proposed that the stable state of surrounding rock after tunnel excavation and the deformation of surrounding rock in each construction stage after tunnel excavation should be included in the judgment index of tunnel surrounding rock grade or as the correction index of BQ value,which has a certain guiding significance for the design and construction of the tunnel.