拟建海堤的选型及其对邻近桥墩的影响

Shape Selection of Sea Dike Planned to Build and Its Influence on Adjacent Pier

基于深圳市大铲湾(宝安中心区段)海堤(西侧)工程与深圳市沿江高速公路桥桩工程,通过对抛石海堤排水固结处理软基、大袋砂海堤排水固结处理软基、抛石海堤爆破处理软基、抛石海堤挖淤处理软基等4种不同类型海堤的基本结构型式及其技术特点进行对比,确定了拟建海堤(西侧)的结构型式;并基于FLAC软件数值模拟拟建海堤(西侧)施工刚完成时对沿江高速公路桥墩的影响。结果表明:拟建海堤(西侧)采用重力式斜坡堤,并使用大袋砂海堤排水固结处理软基方案比较合理;拟建海堤(西侧)施工刚完成时,离海堤边线40.8m处的桥桩水平向最大位移约为7.5mm,离海堤边线176.8m处的桥桩水平向位移更小,显然拟建海堤(西侧)施工时对已建桥桩的影响甚微。

Based on sea dike （west side） project in Dachan Bay （Baoan Center Area） of Shenzhen and pile foundation of riverside highway in Shenzhen, the four kinds of basic structural shapes including ripped-rock sea dikes with drainage consolidation to treat soft foundation, or with blasting to treat soft foundation or with digging silt to treat soft foundation and big bag sand sea dike with drainage consolidation to treat soft foundation and their technical characteristics were contrasted, and then the structural shape of sea dike （west side） planned to build was determined; effect of the sea dike finished on piers of riverside highway was numerically simulated by FLAC software. The results showed that gravity type of inclined dike was selected for sea dike （west side） planned to build, and big bag sand sea dike with drainage consolidation to treat soft foundation was rational; when the sea dike （west side） was just finished, the maximum displacement of piles in horizontal, which was 40.8 m from the bundline of sea dike, was about 7.5 mm, and the displacement was smaller for the piles which was 176.8 m from the sea dike; the effect of sea dike （west side） planned to build on piles finished was little.