A. 踏勘阶段岩溶勘察应以收集资料为主
B. 初测阶段岩溶地区条件复杂的大中桥，每个工点的控制性钻孔不应少于3孔
C. 初测阶段宜对与线路有关的暗河、大型溶洞、岩溶泉进行连通试验
D. 定测阶段工程地质勘察报告中，应阐明岩溶的工程地质条件、评价及处理原则、提出施工阶段需进行岩溶勘察的地段和工作内容
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