深厚软土地基围堰设计及计算研究

Study on design and calculation of cofferdam on deep soft soil foundation

对于基坑有干地施工要求的出海口门建筑物,须在外侧填筑施工临时围堰。建筑物外侧临海,地基表层多为淤泥,土体物理力学性质差。对于深厚淤泥层堰基,如果不采用地基加固措施,围堰极易发生失稳破坏,采用地基加固措施费用较昂贵,施工较复杂,施工期较长,就临时建筑物而言投资代价偏大。基于此,本文以广东某城市出海涵洞外海侧围堰设计为例,探讨深厚淤泥地基围堰结构设计及稳定计算方法,为类似工程提供参考。

The temporary construction cofferdam is necessary to fill at the outside of that when entrance gate building must be constructed on the dry foundation pit. Because the outside of the building is near the sea, the most surface layer of the foundation are the silt with the bad soil mechanical properties. Without the strengthening of the foundation, the cofferdam in deep silt foundation will damage easily causing by the destabilization. As the temporary building, the cost is too large because of the expensive cost, complex and longer period of foundation strengthening construction. Taking a cofferdam design in outside of sea culvert in a city of Guangdong province as the example, the paper discusses the structure design and stability calculation method of cofferdam on deep silt foundation and provides some reference for similar projects.