岩溶区冲孔桩施工技术综述

Jetting bore pile construction technique in karst region

岩溶区因溶沟、溶槽、石芽、鹰咀、溶洞、土洞等发育,基岩面起伏强烈,给岩溶区桩基础施工带来较大困难。钻孔桩、挖孔桩施工技术在复杂岩溶地质条件下适应性较差,冲击钻孔技术对不均匀地层具有良好的适应性,实践证明冲击钻进是岩溶发育区最佳的嵌岩桩基础施工技术。本文重点论述岩溶区不同地质条件下相应的冲孔桩施工方法和钻进事故防治措施。

The construction of pile foundation is difficult for the growth of karren, slot, eagle nib, soil hole, karst etc, and the intensity undulation of rockbed in karst region. The adaptability of the bored pile and excavated pile construction technique in the complicated karst geology region is bad, but that of jetting bore pile is good in karst region. The practice has proved that the drilling with impaction is the best foundation construction technique of rocksocketed pile in karst region. The jetting bore pile construction technique and the prevention and cure measure of trouble in construction were discussed in this paper.