DEM investigation of installation responses of jacked open-ended piles

Liu, Junwei; Duan, Nuo; Cui, Liang; Zhu, Na

doi:10.1007/s11440-019-00817-7

Cited by 47 publications

(13 citation statements)

References 37 publications

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“…Rather than using a continuum to model the soil as finite element analysis (FEA) does, the DEM uses discrete particles that are able to interact to represent the soil body. DEM has been previously used to model a variety of different soil-structure interaction problems including pile plugging (Liu et al, 2019), cone penetration tests (Butlanska et al, 2014) and jacked piles in sand (Ciantia et al, 2019). With the application of an increase gravitational field, the DEM is able to act as a virtual centrifuge (Ciantia et al, 2018) which when properly calibrated, has the added benefit of using a single soil chamber which can be reset and used multiple times.…”

Section: Methodology Used In Discrete Element Methods Simulationmentioning

confidence: 99%

Using discrete element method (DEM) to create a cone penetration test (CPT)-based method to estimate the installation requirements of rotary-installed piles in sand

et al. 2020

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Deep foundations maybe used in a range of soil types where significant foundation resistance is required but their installation is often associated with disturbance due to noise and vibration. Greater restrictions on use in urban and offshore environments is now commonplace. Screw piles and rotary jacked straight shafted piles are two potential methods of silent piling that could be used as alternative foundation solution, but the effects of certain geometric and installation properties such as installation pitch i.e. the ratio between vertical displacement and rotation, on the required installation torque and force in sand are not well understood. In this paper the effects of installation pitch and base geometry on the installation requirements of a straight shafted pile are simulated in 3D using the discrete element method (DEM). The installation requirements of straight shafted piles into sand have been validated against centrifuge testing, in three different relative densities. The DEM shows reductions in installation force can be achieved by increasing the installation pitch or including a conical tip. An existing cone penetration test (CPT) based prediction method for installation requirements has been improved to include the effects of installation pitch and base geometry for rotary installed piles in sand.

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Section: Methodology Used In Discrete Element Methods Simulationmentioning

confidence: 99%

Using discrete element method (DEM) to create a cone penetration test (CPT)-based method to estimate the installation requirements of rotary-installed piles in sand

et al. 2020

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“…Unlike continuum modelling such as the Finite Element Method (FEM), DEM uses discrete particles that are able to interact to model the behaviour of a soil body. DEM has previously been used to model a variety of different soil structure interaction problems such as pile plugging (Liu et al, 2019), cone penetration tests (Butlanska et al, 2014), slope stability (Kim et al, 1997) and jacked piles in sand (Ciantia et al, 2019) including their cyclic response after installation (Ciantia, 2021). Through calibration and validation of the contact models (against triaxial tests or centrifuge model tests), the particle assembly is able to mimic the behaviour of a Accepted manuscript doi: 10.1680/jgeen.21.00104 granular soil bed, with the added benefit of using a single or the same particle assembly multiple times by resetting it to its original condition (Shi et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

Assessing single-helix screw pile geometry on offshore installation and axial capacity

Sharif

Brown

Ciantia

et al. 2021

Proceedings of the Institution of Civil Engineers - Geotechnica

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Due to their low-noise installation and relatively large axial capacity, screw piles have been proposed as an alternative foundation solution in dense sand for offshore renewable energy applications in deeper water. For this to occur, a significant upscaling of onshore dimensions is required. Furthermore, the effects of certain geometric features on installation requirements are still not well understood. In this paper, the effects of base geometry, shaft diameter and helix pitch were investigated using the three-dimensional discrete-element method by simulating the full installation process prior to conducting axial compression and tension tests. The results of the investigation showed it is possible to optimise the geometry of the screw pile to reduce installation requirements, in terms of both vertical installation force (up to 61%) and installation torque (up to 39%), without reducing the axial capacity of the pile significantly.

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“…There have been theoretical advances, including discrete element method and modern tribology theory. The discrete element method can better simulate the application of granular materials, but the constitutive model relationship between granular materials needs to be further explored [27][28][29][30][31][32]. Interface friction has been studied for a long time and several modern tribology theories have been proposed simultaneously.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Explore the Surface Profile of Clay Soil Using White Light Interferometry

Yang

Liu

et al. 2020

Sensors

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In order to have a better understanding of the real contact area of granular materials, the white light interference method is applied to explore the real surface morphology of clay soils under high stress. Analysis of the surface profile indicates that there exists a support point height z0 with the highest distribution frequency. A concept of a real contact region (from z0 to z0 + d90; d90 represents the particle size corresponding to 90% of the volume fraction) is proposed by combining a surface profile with the particle size distribution of clay soil. It was found that under the compressive stress of 106 MPa–529 MPa, the actual contact area ratio of clay soil varies between 0.375 and 0.431. This demonstrates an increasing trend with the rise of stress. On the contrary, the apparent porosity decreases with an increasing stress, varying between 0.554 and 0.525. In addition, as the compressive stress increases, the cumulative frequency of apparent profile height (from z0 − d90 to z0 + d90) has a concentrated tendency with a limited value of 0.9.

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DEM investigation of installation responses of jacked open-ended piles

Cited by 47 publications

References 37 publications

Using discrete element method (DEM) to create a cone penetration test (CPT)-based method to estimate the installation requirements of rotary-installed piles in sand

Using discrete element method (DEM) to create a cone penetration test (CPT)-based method to estimate the installation requirements of rotary-installed piles in sand

Assessing single-helix screw pile geometry on offshore installation and axial capacity

A New Approach to Explore the Surface Profile of Clay Soil Using White Light Interferometry

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