研究目的：鹦鹉洲长江大桥3 号墩位于武昌江岸坡脚，墩位处江岸坡度较大，承台基坑尺寸大且深，采用常规方法进行桩基施工或放坡进行基坑开挖将破坏长江堤防，危及堤防安全。基于此，对3 号墩基础的武昌侧防护进行研究，以找出最为经济、有效的防护方式与计算方法。
研究结论：根据鹦鹉洲长江大桥项目的地质条件，对支挡结构型式进行了研究，通过方案比较，证明 3 号墩采用“桩顶设胸墙单排桩”对大堤进行防护，是最经济、有效的结构型式。且经施工实践检验，证明了防护桩按 m 法，辅以电算，计算桩身截面的弯矩、剪力、变形，以及桩侧土压力的方法，是科学合理的，可以保证其安全性。
Research purposes:The Pier 3 of Wuhan Yingwuzhou Yangtze River bridge is located in the toe of the river bank in Wuchang with big slope and big and deep foundation pit of cushion cap．The Yangtze River levee will be destroyed and endanger the safety if using the conventional method to conduct the construction of pile foundation and slope excavation． Based on this situation，it’s necessary to do the research on protect ion of the foundation of Pier 3 to find the most economic and effective protective way and calculation method．
Research conclusions:According to the geological condition of the Yingwuzhou Yangtze River bridge，the study was done on the retaining structure． The application of " single row pile in breastwork on the pile top " in protecting the levee for the Pier 3 was the most economic and effective structural pattern． The construction practice showed application of the m method along with the computing method to calculate the bending moment，shearing force，deformation of the section of the fender pile body and the soil pressure on the pile side was scientific and reasonable，and with this method，the safety of pile could be ensured．
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