基于BQ值和大地电磁法的公路隧道围岩分级

BQ值法是目前公路隧道围岩分级普遍采用的方法，实际应用中勘察结论多与施工现场存在一定差别。以石家庄西部某隧道为例，采用EH—4大地电磁法对隧道围岩进行了定性分析，并结合BQ值综合确定了围岩等级。结果表明，采用BQ值和EH—4综合评定隧道围岩等级可有效提高勘察精度。

Classification of Surrounding Rock Masses of Highway Tunnel Using BQ and Magnetotelluric Method

BQ method is commonly used for classifying the surrounding rock masses of highway tunnels. In practice, the conclusions obtained by BQ value are usually different from the in-situ observations. In this article, EH—4 electromagnetic system is used to qualitatively analyze the quality of rock masses sur？rounding a tunnel in west Shijiazhuang. Combining BQ values with EH—4, the classification of the rock masses are performed. The result shows that the combination of these two methods can get a result with more accurate classification.