广清高速公路三角岭大桥桩基溶洞及承压水的处治

Treatment of Dissolving Cave and Bearing Water in the Pile Foundation of Sanjiaoling Bridge in GQ Freeway

针对广清高速公路银盏至北江二桥A3标段岩溶地质情况异常复杂,尤其是三角岭大桥的溶洞呈串珠状、漏斗状发育,且相互连通,地层富含承压水等特性,给钻孔灌注桩的施工带来了较大的困难。本文结合现场成桩施工,采用全护筒加套筒的方法处理溶洞及承压水的技术总结,可供同类型施工参考。

Aiming at the extremely complex geological situation of Bid A3 in GQ freeway, especially in Sanjiaoling Bridge there are pearl-like dissolving caves, which are developed like filler, connected one another, and plenty of bearing water, etc. Thus bring many difficulties in the construction of driven cast-in-place pile. Combined with the fieldwork, this paper summarizes the construction method of adding sleeves to total guard barrel and the technique of bearing water for reference.