Abstract
To research the bearing characteristics of post grouting large diameter ultra long piles under post grouting on the tip and side, the load test of three test piles of a super high rise project was carried out, and the numerical analysis method was used to research the load transfer law of post-grouting large diameter ultra long bored piles. Based on this, the differences and advantages of the post-grouting on the tip and side pile versus the non grouting pile and the pile end grouting pile are analyzed. The analytical results show as follows: post grouting on the tip and side will significantly change the performance and distribution of side friction of the piles, and improve mechanical properties of soil and pile-soil interface around piles. The ultimate bearing capacity of the post grouting on the tip and side pile foundation has increased 100% and 52% more than the non grouting and pile end grouting pile foundations. The side friction of post-grouting on the tip and side pile plays a significant difference from the non grouting piles.
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