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Experimental Analysis and Calculation of the Up-lift Resistance Bearing Capacity of Bored Cast-in-place Pile with Enlarged Bottom

ZHANG Dong-liang,YANG Long-cai,WANG Bing-long(Key Laboratory for Highway and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 200331,P.R.China)  
In order to understand float resisting mechanism and its characteristic a test on the bored cast-in-place pile with enlarged bottom and up-lift resistance pile with equal section is carried out.It is found that the bored cast-in-place pile with enlarged bottom can improve the float resisting capability to a great extent.Through the test,the suffering force mechanism and up-lift disciplinarian are discussed.Based on the float resisting mechanism and the existed formula,the calculation for up-lift resistance bearing capacity of bored cast-in-place pile with enlarged bottom in the deep foundation of soft clay area is obtained.It extends the use of the bored cast-in-place pile with enlarged bottom in the deep foundation of soft clay area.
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