207国道某涵洞地基不均匀沉降处理

Treatment on differential settlement of culvert foots in 207 national highway

207国道某涵洞西端拱脚落在人工填土上,且地基实际承载力不能满足设计要求,导致涵洞差异沉降,顶部出现裂缝。采用无砂混凝土小桩技术加固,沉降监测结果显示了这种技术的优势。施工实践表明:施工过程要严格控制冲孔的用水量,回填土的时间和速率应根据小桩的强度发展确定,以防止沉降量的增大。

The west foot of a culvert locating in 207 National Highway is supported on the human fillings, and the load bearing capacity was over estimated in the process of designing, which resulted in the differential settlement and consequent cracking on the top arch. The foundation is processed by nonaggregate minipile, and the following survey shows its effectiveness. It is suggested that the amount of water should be strictly controlled and the back fill should be controlled in a valid pace.