岩溶地区嵌岩冲孔桩成孔技术

The bore technology of embedded rock percussion piles in karst area

对于岩溶地区复杂的地质条件 ,冲击钻进方法是嵌岩桩最有效的成孔方法 ,冲击成孔工艺随地层变化较大 ,冲孔桩成孔的成败决定于成孔工艺的合理性 .冲孔桩施工前应对场地的地质条件有详细的了解 ,并针对岩溶特点做必要的准备工作 .冲击成孔过程中采取合适的施工工艺 ,确保孔壁稳定、桩孔垂直 ,防止卡钻 ,在溶洞内钻进时回填块石和粘土块 ,采取“重锤轻打”方法可达到固壁成孔、防止孔斜的目的 .

For the complicated geographical conditions in karst area, percussive drilling method is the most effective drilling method to embedded rock piles.It is necessary to survey the geographical conditions and make full preparations before the construction of percussion piles.In drilling,appropriate construction technology is chosen to ensure bore_wall stabilization and prevent aiguilles blocking. The method of backfilling rock and clay pieces inside karst cave and 'heavy aiguilles and strike lightly ' can stabilize bore_wall and prevent bore bias.