环胶州湾高等级公路某特大桥桩基工程方案优选

RingJiaozhou Bay Highwaybridgepile Foundation of a Special Program

同一地层条件下的建筑桩基设计及桩型选择的合理与否对单桩承载力水平的最大发挥有明显差异。在环胶洲湾高等级公路某特大桥桩基工程实践中,分析桩端持力层的岩性条件,对该大桥桩基在基岩地层中采用摩擦桩设计提出设计变更建议,当由摩擦桩改为崁岩桩设计后,由于桩端地层端阻力发挥,设计的超长摩擦桩可大幅度减短。不仅节约工程造价,更由于减少了在硬岩地层中大直径超长桩施工的技术难度而缩短工程周期。特大桥梁建成通车多年运营安全稳定,实践证明桩基方案设计变更技术合理、经济、安全。

Under the condition of the same stratum of buildings and public works facilities, the rationality of the pile foundation design and the choice of pile-type will be significant difference for the maximum of pile capacity. In the bridge pile foundation engineering practice for the high road ring Jiaozhou Bay, we analysis the rock conditions of pile bearing stratum, and propose design change recommendations for using the design of friction pile in the bedrock strata. When the friction pile formu- la changed for axial pressure bearing capacity of single pile to calculate, because the bottom of pile tip resistance play a impor- tant role, the long friction piles designed can be reduced dramatically. It does not only save the project cost, but also reduce the technical difficulty of large diameter ultra-long piles construction in hard rock formation to reduce the duration, the bridge com- plete ahead of schedule have a very important economic significance for the high road. The bridge completed for many years, it proof that the ideas of change pile design is correct, and the bridge is security and stability.