地质雷达检测桥梁桩基孔底的技术方法及应用

地质雷达被广泛应用于工程勘探和质量检查，特别在深度较大的桥梁桩基孔底检测方面，可以灵活、高效、精确、无损地判断地层构造和不良地质体，避免其将来对桥梁造成安全隐患。针对贵州盘县至兴义段的桥梁桩基工程，介绍了地质雷达原理，采用地质雷达检测技术，对桥梁桩基孔底进行检测，并通过钻取桩基岩芯进行效果验证。结果表明:桥梁桩基孔底无溶洞、溶沟，且基岩完整性较好，能保证施工安全。

Technical Method and Application of GPR Detection on Hole Bottom of Bridge Pile Foundation

Ground penetrating radar (GPR) is widely used for engineering exploration and quality check, especially the detection on hole bottom of bridge pile foundation in large depth. It can make flexible, efficient, accurate and nondestructive judgement on formation structure and unfavorable geological body and prevent them from endangering the bridge. In relation to the bridge pile engieneering from Panxian to Xingyi, Guizhou, the paper introduced how GPR works and how to use GPR detection technique to check the hole bottom thereof, then validate the result by core drilling. The result shows that there is no karst cave and ditch at the bottom of piles, and the bed rock has good integrity, ensuring safety in construction.