以乌江特大桥岩溶地区4.0m大直径桩基施工为例,针对裂隙发育、地下水丰富、溶洞处治等不同情况,介绍了相应的施工工艺,保证了岩溶地区大直径桩基础施工的顺利进行。江边岩溶地区岩溶、裂隙较发育,江水容易和桩基连通,施工中的止水措施和对岩溶不良地质的处治是保证顺利成桩的关键。 Taking the 4.0m large diameter pile foundation construction in the karst area of ​​Wujiang Grand Bridge as an example, the corresponding construction technology is introduced in view of different development situations such as fissure development, abundant groundwater and cave treatment, so as to ensure the smooth construction of large-diameter pile foundation in karst areas. The karst and fissures in the riverbed karst area are relatively developed, and the river water is easy to connect with the pile foundation. The water-stopping measures and the treatment of the karst unfavorable geology in the riverbank karst area are the key points to ensure the smooth pile formation.