Numerical investigation of soil plugging effect inside sleeve of cast-in-place piles driven by vibratory hammers in clays

Abstract

During driving sleeve of cast-in-place piles by vibratory hammers, soils were squeezed into sleeve and then soil plugging was formed. The physic-mechanical properties of the soil plug have direct influence on the load transmission between the sleeve wall and soil plug. Nevertheless, the researches on this issue are insufficient. In this study, finite element and infinite element coupling model was introduced, through the commercial code ABAQUS, to simulate the full penetration process of the sleeve driven from the ground surface to the desired depth by applying vibratory hammers. The research results indicated that the cyclic shearing action decreases both in soil shear strength and in granular cementation force when the sleeve is driven by vibratory hammers, which leads to a partially plugged mode of the soil plug inside the sleeve. Accordingly, the penetration resistance of sleeve driven by vibratory hammers is the smallest compared to those by other installation methods. When driving the sleeve, the annular soil arches forming in the soil plug at sleeve end induce a significant rise in the internal shaft resistance. Moreover, the influence of vibration frequencies, sleeve diameters, and soil layer properties on the soil plug was investigated in detail, and at the same time improved formulas were brought forward to describe the soil plug resistance inside vibratory driven sleeve.

Research on seismic ground motion parameters applicable to the safety of rectangular shallow tunnel

“…Xiao et al 13 used infinite element boundary simulations of infinite soils to study the effect of soil blockage during vibrations of grouted piles. Kouroussis et al 14 calculated the structural response of vehicle loads on roadbeds to study the propagation and reflection effects of infinite element boundaries on load waves.…”

A numerical model of VPS for offshore wind turbine monopiles based on hypoplastic theory

“…Xiao et al 19 . indicated that the soil reaches a partially plugged during the high‐frequency vibration penetration of the pipe pile, where the soil plug moves upward relative to the sleeve wall.…”

“…proposed the simplified calculation of soil plug resistance$${Q_{plug}}$$ $$\begin{equation}{Q_{plug}} = \pi d\int\limits_{(H - h^{\prime})}^H {\eta \left[ {p + ({e^{4\eta z/d}} - 1)\left( {p + \frac{{\gamma ^{\prime}d}}{{4\eta }}} \right)} \right]} dz\end{equation}$$where $$H$$ is the penetration depth, $$h^{\prime}$$ is the effective soil plug height, $$d$$ is the pipe pile diameter, $$p$$ is the boundary pressure, $$\gamma ^{\prime}$$ is the effective soil gravity, and $$\eta $$ is a coefficient that depends on the earth pressure coefficient$$K$$ and contact friction coefficient$$\tan \delta $$. Specific parameter determination methods are based on Xiao et al 19 …”

“…used CEL technology to simulate a soil plug changing inside a pipe during the pipe pile penetrating into a cohesive soil foundation. Xiao et al 19 . studied the soil plugging effect using a simulation conducted for vibratory casing driving with ABAQUS software.…”

Variability of Seismic Loading over the Surface of a Concrete Slab in Interaction with the Subsoil

“…Anthropogenic vibrations are generated in the surroundings of roads as well as train and tram lines [1][2][3]. These vibrations also occur in the vicinity of construction works [4][5][6][7][8]. From the source of the anthropogenic dynamic load, vibrations are transmitted through the rock mass and the foundation structure of the building to the superstructure.…”