BQ围岩分级法在麻崖子隧道中的应用

Application of BQ Surrounding Rock Classification in Mayanzi Tunnel

由于地质条件的复杂多变,以及勘察技术缺陷等原因,使原设计的围岩级别与实际施工的围岩级别有很大差异。在现场需要快速、准确地判定出围岩分级以利于施工进度和支护参数的选取。使用BQ法对武罐高速公路麻崖子隧道围岩进行分级变更;介绍了BQ法主要考虑因素、参数的快速获取方法。结果表明:该方法能在现场快速、准确地进行围岩分级。

Due to complex and volatile geological conditions and defective investigation technique, the originally designed surrounding rock classification is different from that in practical construction to a great extent. However, the classification is required to be determined quickly and accurately at the site for the sake of construction progress and parameter selection for the support. This paper adopted BQ method to modify the classification of rock surrounding Mayanzi Tunnel on Wudu-Guanzigou expressway, as well as presented the main considerations in relation to BQ method and the method rapidly acquiring parameters. The result shows that this method may carry out surrounding rock classification as required at the site.