海堤闭气土方加速固结应用技术研究

Technical research on accelerating consolidation of sea embankment closure earthwork

围垦工程中的海堤是直接建造在海涂上的土石坝,一般在外海侧抛填石方挡潮,在内坡侧填筑闭气土方防渗,闭气土方直接取自海堤附近的浅层淤泥质黏土,由于这种海涂泥含水率高,土性极差,使得土方填筑形成的内侧土坡较平缓,工程量很大,严重影响着围垦工程施工进度。结合浙东沿海围垦工程实际,通过3a多的现场连续测试和大量的室内试验,提出了加速海涂淤泥质黏土固结的措施和方法。

The sea embankment in reclamation projects is an earth-rock dam built directly on the tidal flats. In general, block stones are dumped on off-sea side for fide-resisting; closure earthwork, which was directly taken from shallow silt clay nearby the sea embankment, is placed on in- slope side for seepage control. This kind of silt clay has high moisture content and poor soil characteristics, making its in-slope side flat and influencing construction progress. Combining the practice of East Zhejiang reclamation projects as well as in-site measurement and indoor experiment for more than three years, the steps and ways taken for consolidating silt clay are put forth in the paper.