红砂岩地区浅埋隧道超前地质预报方法研究

Research on advanced geological foreast method of shallow tunnel in red sandstone region

文章以红砂岩的不良工程性质为基础,探讨了红砂岩地区浅埋隧道的超前地质预报方法的优化组合。通过对比分析目前国内外现有的各种超前地质预报方法的优缺点,提出了采用隧道顶部激电极化法探测与隧道内地质雷达法相结合的一套组合方案,应用到湖南省某高速公路隧道,对预报结果进行详细的处理和分析,给施工单位提出了合理的施工建议。施工结果表明,超前预报结果与开挖实际情况基本吻合,提出的合理建议使施工顺利穿越软弱地层,避免了不良地质灾害的发生。

Based on the bad engineering property of red sandstone, the best combination of all kinds of advanced geological prediction method which is applicable to red sandstone region was discussed. After contrasting the advantage and disadvantage of many methods, the combination of GPR and induced polarization is more reasonable and applied in one highway tunnnel of Hunan province. After discussion and analysis of the result of prediction, some construction advice is brought forward to the builder. The excavating shows, the actual result certificate that the forecast result is very a~＇：curate. By the advice the flabbily interlayer is waltzed through, and the disaster is avoided.