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对JTG C20-2011《公路工程地质勘察规范》相关内容进行分析讨论,得出一般桥位初勘时,摩擦桩基础钻探深度应参考98规范5.3.4条,详勘时钻至桩底以下不少于5~20m;应采用波速测试手段准确查明采用嵌岩桩的软质岩桥位与岩质深路堑段的岩体完整性程度;膨胀土详判分级3项指标中符合2项即可确定该级别,其中塑性指数IP是采用76g平衡锥入土深度17mm或100g锥入土深度20mm或卡氏碟式仪取得的液限值计算得出。
JTG C20-2011 “Highway Engineering Geological Survey Code,” the relevant content analysis and discussion concluded that the general bridge bit when the first exploration, friction pile foundation drilling depth should refer to 98 norms 5.3.4, drill down to the bottom of the pile is not Less than 5 ~ 20m; Wave velocity test method should be used to accurately identify the use of rock-socketed piles of soft rock bridge and deep rock cutting rock mass integrity; three indicators of expansive soil classification graded meet two This level can be determined where the plastic index, IP, is calculated using the liquid limit obtained with a 76 g balance cone into a soil depth of 17 mm or a depth of 100 g into a soil depth of 20 mm or a Karl diskette.