武汉地区岩溶地层钻孔灌注桩成孔技术研究与实践

Experimental Study and Practice of Boring Technology for Bored Cast-in-place Pile in Karst Formation of Wuhan Area

摘要:

随着城市基础设施建设及城市化进程的加快，有更多的钻孔灌注桩设计在岩溶地层。在岩溶地层进行钻孔施工容易发生孔内事故，且出现频率较高，处理难度很大，经济损失较大。通过对溶洞裂隙发育的石灰岩地层进行注浆加固，然后进行钻孔桩成孔工艺的试验研究。结果表明，该方法在比较好的解决了石灰岩地层成孔效率低、孔内事故多及泥浆混凝土漏失的技术问题。对岩溶地层进行钻孔桩施工具有重要的参考意义。

Abstract:

Downhole trouble often occurs while drilling in karst formation, which is very difficult to deal with and lead to great economic loss. Grouting reinforcement was operated in limestone formation of cave fracture and experimental study was made on bored cast-in-place pile technology. The result shows grouting reinforcement can solve the low efficiency of hole forming, downhole trouble and slurry concrete seepage in limestone formation, and it can be the reference to bored pile construction in karst formation.