Distribution and dissipation laws of excess pore water pressure based on pile-soil interface during pile-sinking in saturated clay. Issue 167 (April 2023)

• Record Type: Journal Article
• Authors: Wang, Yonghong; Jin, Jiamin; Han, Bo; Jiang, Yishun; Jeng, Dongsheng; Liu, Huining; Liang, Zuodong; Cui, Lin
• Is Part Of: Soil dynamics and earthquake engineering. Issue 167(2023)
• Publication Date: 2023-04
• Subjects: Saturated clay -- Pile-soil interface -- Excess pore water pressure -- Distribution laws -- Dissipation laws -- Field test; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2023.107807
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: PHC pipe pile cooperated with jacked method is widely used in recent years. The excess pore water pressure of pile-soil interface caused during jacked PHC pipe driving would produce important effect on jacked pile construction and bearing characteristics. Two full scale jacked-in piles are penetrated into the clayey soil and studied by monitoring the law of generation and dissipation of excess pore water pressure. The law of excess pore water pressure with penetration depth and time is also analyzed. From this test results, excess pore water pressure of the pile-soil interface increases to the peak and then begins to decrease, but it remains large. The excess pore water pressure of S1 test pile pile-soil interface decreases from 201.4 kPa to 86.3 kPa, and decreases from 374.1 kPa to 114.3 kPa for S2 test pile. The excess pore water pressure of pile-soil interface rises first at the initial stage of consolidation, and it dissipates when the hydraulic gradient between pile-soil interface and soil around the pile disappears. The dissipation degree of excess pore water pressure reaches from 75% to 85%. The proposed solution provides certain engineering significance for jacked pile construction and bearing capacity design in the clayey foundation. Highlights: Through on-site monitoring of the distribution and dissipation of excess pore water pressure at the pile-soil interface, the stress characteristics of the pile-soil interface during the PHC pipe pile sinking process were studied. The maximum ratio of excess pore water pressure of pile-soil interface to effective pressure of overlying soil is 1.08, and gradually decreases along the pile. The excess pore water pressure at the pile-soil interface caused by pile sinking is approximately linearly increased with the depth of the soil. Studying the generation and dissipation of excess pore water pressure at pile-soil interface is helpful to reveal the important characteristics and bearing capacity of pile-soil interface during pile-sinking.