桩基础底部溶洞多孔高压射流后压浆技术研究

Research on Multi-hole High Pressure Jet Grouting in Treating Caves Under Pile Foundation

岩溶地区地质情况复杂,部分桥梁桩基础位置常常处于溶(土)洞影响的范围内,影响桥梁结构安全,常规处理方法主要是通过加长桩基础穿过不良地层或施工前预先处理,但对成桩后发现较大溶洞处理技术一直是桥梁技术难点,结合实际工程研究,采用多孔高压射流对成桩后发现的桩底溶洞进行压浆处理。

With complex topographic and geological condition in karst area,within the spheres,the site of bridge pile foundations locates in influence range of karst caves,which has long been one of hydrogeological problems,and it decreases the bridge's safety and durability. The most common measure to deal with this issue is lengthening the pile foundation so as to make it possible to go through unfavorable geologic bodies or pre-processing it before construction. However,it still has long been a hard technical challenge that when we discover karst caves after pile-forming construction has been finished.Based on the engineering practice,this paper tries to adopt multi-hole high pressure jet grouting to treat caves under pile foundation.