Experimental study and numerical analysis on bearing characteristics of large diameter ultra long bored piles with post grouting on the tip and side

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Zhai, Dezhi^1 ; Zhou, Feng^1,2 ; Zhou, Jinfeng^1 ; Zhu, Rui^1

College of Transportation Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu

210009, China^1

Nanjing New Geotechnical Engineering Co. Ltd., Nanjing, Jiangsu

210009, China^2

关键词: Analytical results;    Bearing characteristic;    High rise projects;    Large diameter;    Load transfer laws;    Pile-soil interface;    Post grouting;    Ultimate bearing capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/2/022024/pdf
DOI  :  10.1088/1755-1315/189/2/022024

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

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.