轨道交通高架车站扩底桩设计探讨

Design of Belled Base Pile in Elevated Station of Transit

在上部为软土、持力层为岩层的长江漫滩区域,轨道交通高架车站桩基采用扩底桩是提高桩基承载力的有效手段。文章对1.2 m直桩和扩底桩2种类型桩基进行了对比分析,并根据相关规范对扩底桩进行了地震作用下的受力分析,得到了扩底桩具有明显的高承载力和经济性优势以及扩底桩直桩部分不宜过小的结论。

Considering that Yangtze River valley flat is composed of the upper soft clay and the bearing stratum of rock, it is efficient to use the belled pile foundation which can provide larger bearing capacity during the pile foundation design of elevated station in urban transit line. Two types of pile foundation with 1.2m diameter pile and belled pile base are compared and analyzed, and mechanic analysis of the belled pile foundation under earthquake action is carried out according to relevant codes and norms. Furthermore two preliminary conclusions are obtained and the belled pile is with obviously advantage of bearing capacity and advantage of cost effectiveness.