砂卵石地层钻孔桩成孔施工技术

摘要

The paper presented a kind of drilling hole method that adopted direct circulation and percussion drilling,casing and cliff-protection by mud.The method applied in the complex gravel layer which has the trend to emerge cave-in and drop from the drilling wall.%介绍一种在砂卵石地层层厚复杂、孔壁易掉块、易坍塌的钻孔的成孔方法——正循环回转与冲击钻进、套管与泥浆护壁成孔。