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根据前期勘察成果与后期地质调查结果,结合大量的工程实例经验,提出公路隧道地质风险等级划分标准(A级～D级),并由此确定不同风险等级下施工地质预报方法的选取。在总结与分析隧道施工地质预报系统对不良地质体的探测结果(发育特征与发育程度)的基础上,提出隧道地质预报预警等级(Ⅰ级～Ⅳ级),并建立隧道施工地质预报预警机制。最后将研究成果应用到大广南高速公路长乐山隧道,取得了良好的应用效果。
According to the results of previous surveys and the results of later geological surveys, combined with a large number of engineering practice experiences, the criteria for classifying geological hazard levels of road tunnels (Grade A to Grade D) are proposed, and the selection of construction geological prediction methods under different risk levels is determined. On the basis of summarizing and analyzing the detection results (development characteristics and degree of development) of the tunnels by the construction geological forecasting system on the unfavorable geologic bodies, the paper puts forward the geological forecasting and warning levels (Ⅰ ~ Ⅳ) and establishes the geological forecasting warning mechanism. Finally, the research results are applied to the Changle Mountain Tunnel of Daguangnan Expressway and achieved good results.