公路工程挡土墙CFG桩复合地基病害分析与处理措施

滨江快速公路K7+400~K12+000段,处于软土地区,采用CFG桩加固挡土墙软土地基后,挡土墙发生变形,通过路基挡土墙基底CFG桩复合地基承载力和沉降变形计算对挡土墙基底沉降变形病害进行分析。结果表明:尽管CFG桩复合地基强度达规范要求,但其沉降变形过大,导致了挡土墙产生病害。在墙背换填气泡混合轻质土后,挡土墙变形得到控制,没有产生新的变形。

Cause Analysis of Diseases of CFG Piles Composite Foundation at Retaining Wall in Highway Engineering and the Treatment Measures

The K7+400～K12+000 section of Binjiang Expressway locates in soft soil area. After the soft foundation of retaining wall was reinforced by CFG piles, the wall deformed. Through calculation of bearing capacity and settlement of CFG pile composite foundation on the base thereof, the settlement deformation diseases were analyzed. The result shows that, although the CFG pile composite foundation has the strength as required by the specification, as a result of too large settlement deformation, the retaining wall is attacked by diseases. When the wall back is filled by foamed mixture light-weight soil alternatively, the deformation is under control without any new change.