Abstract
This paper presents a discrete element modelling of the installation responses of rigid open-ended piles with different diameters. A two-dimensional model of granular soil is generated using the particle flow code. The model is generated under 100 g gravity to simulate deep foundations. The simulation results show good agreement with the published experimental measurements. Particle-scale information is retrieved to reveal the micro-mechanics underlying these dynamic behaviours. It is found that relative particle displacement field provides clear micro-scale evidence to the development of shear zones. The instantly fully plugged mode and the partially plugged mode continuously exchange during pile installation, which is more apparent in slimmer pile. Pile base resistance (plug resistance plus annulus resistance) contributes to the majority of pile resistance. The plug resistance is only concentrated within the zone 2–3 times of pile diameter above the pile base. The unit lateral resistance at a specific depth decreases in pile installation. Pile installation causes increases in the average stresses surrounding the pile, with the major influence zone concentrated within six times of pile diameter.
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Abbreviations
- d 10 :
-
Particle diameter at which 10% particles by mass are smaller (mm)
- d 50 :
-
Particle diameter at which 50% particles by mass are smaller (mm)
- d 60 :
-
Particle diameter at which 60% particles by mass are smaller (mm)
- d pd :
-
Distance between the centre of pile and model side boundary (mm)
- d hp :
-
Distance between the bottom of pile and bottom of soil (mm)
- d pp :
-
Distance between the centres of two adjacent pile clump particles (mm)
- d pt :
-
Distance between the outer and inner pile clump particles (mm)
- d pw :
-
Model pile wall thickness (mm)
- d pile :
-
Pile diameter (mm)
- D :
-
Model soil container depth (mm)
- E p :
-
Particle Young’s modulus (Pa)
- g :
-
Gravity (m/s2)
- k n :
-
Particle normal contact stiffness (N/m)
- k s :
-
Particle shear contact stiffness (N/m)
- L :
-
Model pile length (mm)
- m r :
-
The radius of measurement circle (mm)
- R pile :
-
Radius of pile clump particles (mm)
- µ :
-
Friction coefficient between particles or between particle and wall
- γ :
-
Bulk unit weight (kN/m3)
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Acknowledgements
The authors gratefully acknowledge the support from National Natural Science Foundation of China (41502304, 41772318), Qingdao Fundamental Research Project (16-5-1-34-jch), Shandong Key Research and Development Plan (2017GSF20107), Open Fund of State key Laboratory of Coastal and Offshore Engineering (LP1712), Ministry of Housing and Urban-Rural Development of China (2014-K3-026).
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Liu, J., Duan, N., Cui, L. et al. DEM investigation of installation responses of jacked open-ended piles. Acta Geotech. 14, 1805–1819 (2019). https://doi.org/10.1007/s11440-019-00817-7
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DOI: https://doi.org/10.1007/s11440-019-00817-7