安庆广济江堤双层地基渗流分析及工程措施

渗流破坏特别是管涌，是江堤失事的重要原因。安庆广济江堤部分堤段堤基上层是弱透水覆盖层，下层是强透水砂层，为典型的双层结构地基。1998年汛期多处发生管涌。设计采用规范公式和有限元进行渗流分析，结合实际情况，不同的堤段分别采取了垂直截渗墙、减压井和盖重等工程措施，对堤基进行加固处理。

The Analyze of Double Layer Foundation Seepage Flow and the Project Measures forRiver Embankment of Guangji in Anqing

Seepage destruction is the main reason of river embankment failure, especially the failure by piping. At the river embankment of Guangji in Anqing, the upper layer at the foundation part of embankment sections is weak pervious overburden and the strong pervious sand bed is in lower layers and they are typically double layer structure foundation. In 1998, the failure by piping happened in many places during flood period. The standard formula is adopted in the design and the seepage flow analyzes is conducted by using finite element. The project measures such as vertical cutoff seepage wall, relief well and cover weight were adopted at different embankment sections respectively combining the real condition and the reinforcement treatment was done for the embankment foundation.