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Test and research on pile-end post-grouting piles technology for super-large bridge pile foundations

Gong Weiming Dai Guoliang Zhang Haowen(Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China)  
The application of pile-end post-grouting piles technology for super-large bridge piles is introduced,and there are totally 21 test piles for research which have been located in some important projects such as Sutong Yangtze River Bridge,Donghai Bridge,Hangzhou Bay Sea-Crossing Bridge,Shanghai Yangtze River Bridge of Shanghai-Chongming-Jiangsu channels etc.The maximum pile diameter varies from 2.5 meters to 3.2 meters,and the maximum length is 125 m.The bearing capacity of post-grouting piles is over ten thousands tons.Based on the test results,the improvement of the bearing capacity and displacement and the bearing characteristic before and after grouting are analyzed.The bearing capacity of piles are increased in some degree despite the differences in the patterns of grouting pipes,pressure,dosages of cement,grouting lasting time and so on.However,the increased values are very discrete.The calculation formula for the post-grouting piles in the prescriptive grouting condition is deduced based on the statistics analysis results of 57 test piles.The research results have been applied to the design of bridge foundation,which can exert the bearing potential and obtain notable economic benefit.
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