水南特大桥8#墩位于两条断层交汇处的岩溶地质区域,其中右幅8#墩桩位更是处在古岩溶漏斗之上,桩基深度达到100m,地质构造特别复杂,多次钻孔不能成孔。基于桩基地质特征和钻孔塌孔原因分析,提出采用人工成孔技术。实践表明:在复杂地质条件下,人工挖桩是深孔桩成孔的一项有效方法。文中对深桩人工挖孔施工和混凝土浇灌的方案、关键技术和安全措施进行了详细介绍。 Shuitian Bridge No. 8 Pier is located in the karst geological area where the two faults meet. Among them, the 8 # pier in the right is more located on the ancient karst funnel with a pile depth of 100m. The geological structure is particularly complex with multiple drills Hole can not be a hole. Based on the analysis of pile foundation geological characteristics and the reason of borehole collapse, a method of artificial hole formation was proposed. Practice shows that under complex geological conditions, artificial digging pile is an effective method for deep hole pile forming. In this paper, deep piles artificial digging construction and concrete irrigation program, key technologies and safety measures were introduced in detail.