三角形沉箱新结构研究

On new structure of triangular caisson

结合长江南京以下深水航道建设工程一期工程结构设计投标,研究开发了三角形沉箱这一新型沉箱结构形式,提出了结构设计方法。研究表明,三角形沉箱采用与水平面夹角不大于60°的侧板可显著提高抗倾稳定性、抗滑稳定性,减小基底应力;具有斜坡堤无立波效应、承受波浪力小、基底应力小、对地基承载力要求不高的优点,又有重力式结构堤石料用量少、预制安装施工效率高的优点,可用于防波堤、防沙堤、整治建筑物等堤坝工程。

Combining with the design bidding Phase 1 of Yangtze River downsteam from Nanjing 12.5 m Deep-water Navigation Project, we propose a new structure of triangular caisson and its design method. The study on the new structure indicates that such a triangular caisson can significantly enhance the stability against overturning and sliding and also reduce the foundation pressure if the angle between the side plate and horizontal plane is no more than 60 degrees. Such a structure has not only the advantages of mound breakwater, such as no standing wave effect, little wave pressure, foundation pressure and less restrictive requirements for the ground bearing capacity, but also those of gravity structures, namely the usage of fewer rocks and high efficiency of installing prefabricated components. To sum up, the new structure of triangular caisson can be applied to breakwater, sand-control dam and regulating structures, etc.