New method to calculate apparent phase velocity of open-ended pipe pile

Abstract

The apparent phase velocity of open-ended pipe piles after installation is difficult to predict owing to the soil-plug effect. This paper derives an analytical solution to calculate the apparent phase velocity of a pipe pile segment with soil-plug filling inside (APVPSP) based on the additional mass model. The rationality and accuracy of the developed solution are confirmed through comparison with the solution derived using the soil-plug Winkler model and experimental results. A parameter combination of the additional mass model that can be applied to concrete pipe piles used most commonly is recommended. The attenuation mechanism of the soil plug on the APVPSP is clarified. The findings from this study demonstrate that the APVPSP decreases with the mass per unit length of the pile, but has nothing to do with the material longitudinal wave velocity of the pipe pile. The APVPSP decreases significantly as the impulse width increases; however, for pipe piles without soil-plug filling inside, the impulse width has negligible influence on the apparent phase velocity.

Comparative Study on Seismic Response of Pile Group Foundation in Coral Sand and Fujian Sand

“…Chen et al studied the dynamic characteristics and damage law of subway station [21]. Other scholars have also undertaken a lot of research on the dynamic response of various structures and foundations under earthquake using shaking table test and found that the depth and compactness of soil, the existence of structures, and the input parameters of shaking excitation have obvious effects on site liquefaction and dynamic response of structures and soil [22][23][24][25][26][27][28][29][30]. However, the above studies are aimed at the terrigenous sands, and there are few studies on coral sand at present.…”

Vertical vibration of a rigid strip footing on viscoelastic half‐space

“…Design of structures acquires accounting for how foundations (e.g., piles and rigid footings) interact with soil subjected to dynamic loading such as seismic loads and machine vibrations 1–4 . The common approach to this problem considered the foundation soil as an elastic, homogeneous, and isotropic half‐space, commonly abbreviated as elastic half‐space, and assumed a specific distribution of contact stresses below the rigid foundation.…”

Dynamic analysis of an axially loaded pile embedded in elastic‐poroelasitc layered soil of finite thickness

“…Pile foundations are used to transfer static and dynamic loads to competent soil layers, which are commonly found below the groundwater table. Interaction of piles with their surrounding soil is particularly important for the analysis of dynamic soil‐foundation‐structure interaction problems; therefore, various approaches are proposed in the literature for modelling the response of piles subjected to harmonic loads . Early methods consider soil as single‐phase medium.…”