Rapid Load Testing on Piles

Hölscher, P.; Brassinga, H; Brown, M. W.; Middendorp, P.; Profittlich, Maarten; Tol, Frits A. van

doi:10.1201/b11437

Cited by 9 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis is performed at the unloading point, defined as the instant where the displacement is at its maximum (velocity is zero); hence, eliminating the damping effect simplifies the equilibrium forces to the static soil resistance, impact force, and inertia force [59]. The load-settlement curve can be accurately described using a hyperbolic model [60]:…”

Section: Derived Load-settlement Curvementioning

confidence: 99%

“…This approach assumes that the pile is simulated as an SDOF model; however, the system motion is defined as the mean of the dynamic responses observed at both the pile's head and tip. These methods' procedures are discussed in detail elsewhere [57,60,61]. Consequently, the MUP method is employed to analyze the dynamic responses measured from the FEM modeling to derive the calculated load-settlement curve.…”

Section: Derived Load-settlement Curvementioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

Salem,

El-Saei,

Krajníková

et al. 2024

Buildings

View full text Add to dashboard Cite

Large-diameter bored piles can safely transmit loads from structures by skin friction to the surrounding soil strata and end bearing at the bedrock layer, thereby providing a high compressive capacity. High-Strain Dynamic Testing (HSDT) provides a unique alternative technique to traditional Static Load Testing (SLT) for determining the static compressive resistance of the bored piles, considering its quicker performance and significant cost reductions. This article’s main objective is to numerically explore the performance of large-diameter bored piles during the HSDT and to understand their dynamic behavior under an axial compressive impact force. This research is based on testing pile foundations for reinforced concrete mixed-use towers in the coastal zone of New Alamein City, Egypt. The tested pile is a 1.20 m diameter bored pile. Numerical modeling is performed to simulate both the HSDT and the SLT for two piles at the same site. Non-linear axisymmetric finite element modeling is employed to validate both test records and develop some sort of matching between the two tests. As lumped models, the developed numerical models use the signal-matching process, which is conducted by varying and adopting the strength parameters and deformation characteristics of the ground or soil deposit and the soil–pile interface. The predicted load-displacement curves, developed from analyzing dynamic records employing the Modified Unloading Point (MUP) method, are consistent with the field records. The verified non-linear models are utilized to accomplish a comparative parametric analysis to better understand the drop-mass system aspects. The analysis results emphasize the significance of employing adequate impact energy (i.e., dropping height and mass) to move the pile top to a sufficient extent to mobilize its full resistance. However, a longer impact duration, i.e., larger mass, is more effective for achieving a deeper high-strain wave. The impact load should be developed by a larger drop mass with a lower drop height, not a smaller drop mass with a higher drop height. The results also indicate that, for relatively longer piles, the skin friction of the upper layers surrounding the pile shaft is fully mobilized, whereas the skin resistance of the lower layers is not fully mobilized, regarding the stress wave phenomenon effect. Finally, this study’s findings can be employed to develop guidelines and design procedures for the HSDT to be effectively performed on bored piles.

show abstract

Section: Derived Load-settlement Curvementioning

confidence: 99%

Section: Derived Load-settlement Curvementioning

confidence: 99%

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

Salem,

El-Saei,

Krajníková

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…Indeed, a large part of engineering problems includes research into high-rate strain-stress (HSR) soil response. This includes stress related to, inter alia, explosions [19][20][21], earthquakes, mine explosions [22], wheel loads of vehicles and aircrafts [23], dynamic soil compaction [24] and pile driving [25]. This is associated with the need to create as true and correct as possible constitutive models that are important in the process of calculating geoengineering properties as part of computer-aided design methods.…”

Section: Introductionmentioning

confidence: 99%

Archives of Civil Engineering

Chmielewski,

Kruszka,

Rekucki

et al. 2021

View full text Add to dashboard Cite

The paper includes experimental research using the Split Hopkinson Pressure Bar to determine dynamic compression curves and strength dynamic parameters to depend on the strain rate and moisture for silty sand soil samples.Those experiments are oedometric type based in a rigid confining cylinder. Samples of silty sand with fine a fraction content were taken for the study. To ensure sufficiently uniaxial strain of the tested material, the soil samples were placed in properly prepared casings made of duralumin for the needs of the tests. Thanks to the use of measuring strain gauges on the initiating and transmitting bars, as well as the casing, the nature of the loading pulse was obtained, which was then subjected to the process of filtration and data processing to obtain the nature of the incident, reflected and transmitted wave. During the above dynamic experiments with the representative of silty sand soils, it was observed that its dynamic compaction at a high strain rate is different than in the case of the Proctor test. This is due to higher compaction energy, which additionally changes the grain size by destroying the grains in the structure. The paper presents the results of particle size distribution analysis for two different types of soil samples -this type of analysis is unique. Hence experiments should be further continued for such soils with different granulations and various moisture using, for example, Hopkinson measuring bar technique to confirm for other silty sand soils that are often subgrade of various engineering objects.

show abstract

Literatur

2012

Empfehlungen Des Arbeitskreises „Pfähle“: EA‐Pfähle

View full text Add to dashboard Cite

Rapid Load Testing on Piles

Cited by 9 publications

References 0 publications

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

Archives of Civil Engineering

Literatur

Contact Info

Product

Resources

About