滨海地区高速公路加宽工程特殊路基处理

滨海地区高速公路路基加宽工程中,原有地基及路基沉降已基本完成,而新加宽部分地基及路基沉降刚刚开始。新旧路基在稳定性和路基承载力等方面的差异,使新旧路基之间产生相对较大的差异沉降,进而引起既有路基变形,新路基失稳。通过京津塘高速公路道路加宽工程特殊路基处理设计,介绍了水泥搅拌桩与土工格栅相结合为主,开挖台阶、回填石灰土为辅的综合处理措施。检测结果表明:加固后的复合地基强度高,总沉降与工后沉降均较小,结合部强度高。

Treatment of Special Roadbed Widened for the Expressway in Coastal Region

In widening the expressway roadbed in the coastal region, settlement of the original ground and roadbed has generally completed, but that of the newly widened part thereof is just beginning, causing great difference in settlement between the new and old parts of roadbed, and, further, causing deformation of the existing roadbed and instability of the new roadbed. Through special ground treatment in Jing-Jin-Tang Expressway Widening Project, cement mixed piles are adopted in connection with geogrid reinforced underlying layer, including some comprehensive measures such as excavation of terraces and backfill of lime soil. Results from the test show that: the composite foundation is of higher strength, with less ground settlement and higher strength at the joining part.