Experiment on Soil Squeezing Effect During Penetration of PHC Pipe Pile Static Pressure Pile in Deep Silt Site

• Published in: IOP conference series. Earth and environmental science 2021-03, Vol.706 (1), p.12005
• Main Authors: Wang, Qi, Ding, Jihui, Zhang, Jinlei, Yan, Shengkang, Yu, Zenghui, Wang, Haochen
• Format: Article
• Language: English
• Subjects: Compressing; Diameters; Earth pressure; Penetration depth; Pile driving; Pipe piles; Pore water; Pore water pressure; Soil stresses; Soils; Static pressure; Unloading; Water pressure
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/706/1/012005

This paper takes the construction of a foundation pile project in Wenzhou as an example. Through indoor experiments, the law of squeezing soil stress with time and space and the dissipation of pore water pressure during the process of pile driving are studied. The test results show that (1) the static pressure of pipe pile driving has a good exponential increase relationship with the pile penetration depth; (2) the pile bottom pressure and radial squeezing soil pressure have a linear relationship with the pile penetration depth; (3) the radial earth pressure increases with the static pressure on the top of the pile during pile sinking, while decreases during unloading; the increment of radial earth pressure decreases with the increase of the distance between the pile and the measuring point, and the radial squeezing range can be determined according to the increase ratio of the radial earth pressure; (4) the ratio of the excess pore water pressure to the distance from the measuring point to the pile diameter decreases exponentially.