Free-Falling Penetrometers: A Laboratory Investigation in Clay

Chow, Shiao Huey; Airey, David

doi:10.1061/(asce)gt.1943-5606.0000973

Cited by 16 publications

(3 citation statements)

References 21 publications

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“…Although laboratory 1g model FFP tests involving earlier FFP systems have been reported (e.g. Dayal et al, 1975;Stoll et al, 2007;Chow & Airey, 2014), the studies were mainly limited to uniform soil and did not consider the pore pressure response during and after penetration. In this paper, the performance of the newer generation FFPs is investigated through a series of centrifuge tests in normally consolidated kaolin clay.…”

Section: Introductionmentioning

confidence: 98%

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Chow¹,

O’Loughlin²,

Randolph³

2014

Géotechnique

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This paper considers centrifuge modelling of free-fall piezocones in soft clay, and interprets the test data to estimate the undrained shear strength and coefficient of consolidation. Data from the free-fall piezocones, which involved dynamic embedment in a normally consolidated kaolin clay sample from various drop heights, were compared with equivalent data from piezocone tests. The undrained shear strength, as interpreted from the acceleration trace of the free-fall piezocone, was found to be in good agreement with that derived from the piezocone penetration tests. The free-fall piezocone is also found to produce identical pore pressure dissipation behaviour as for a statically penetrated piezocone, despite a significant rise in the pore pressure at the start of the dissipation phase.

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Section: Introductionmentioning

confidence: 98%

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Chow¹,

O’Loughlin²,

Randolph³

2014

Géotechnique

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“…From field testing and laboratory observations, Lunne et al [146] and Stephan [149] show that quantitative measures, such as cone resistance, bearing capacity, shear strength, or void ratio, can be extracted through further processing of qualitative penetrometer data. "Chow and Airey [150] present an empirical model based on model penetrometer tests and reference triaxial tests to determine undrained shear strength of clayey soil targets and the influence of penetrator mass, penetrator tip shape, impact velocity, and the strain rate on undrained shear strength". The authors conclude that projectile mass and tip shape have a negligible influence on the strain rate effects during the tests.…”

Section: Impact Penetration Based Soil Investigationmentioning

confidence: 99%

Advances in Projectile Penetration Mechanism in Soil Media

et al. 2020

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The penetration to geological shield occurs in many situations at various velocities and scales, for example, meteor-cratering, pile driving, falling of objects from high-rise building construction, and debris/fragments from failed components. The soil media is an efficient energy dissipation system and effective shock protection shield. Impact circumstances are currently getting widespread attention. A lot of research has been done on soil media for impact and penetration. The phenomenon of dynamic penetration in heterogeneous particulate soil medium is very complex and the target soil media under dynamic impact especially under high speed and deep penetration neither behave completely as solid nor as liquid. The topics of recent research interest in the field of penetration to soil media and their significant findings are critically reviewed in the present study. The dedicated review of analytical, empirical, experimental, and computational methods to predict the response of soils media-impacting objects to penetration is presented. The emerging challenges in fundamental research of penetration into soil media are outlined and it is an attempt to formulate the future research directions in the field of soil media penetration.

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“…In recent years, many experimental [2,3,5] and numerical studies [6,7] investigated the cone penetration mechanism associated with the FF-CPT. The studies point out that the uncertainties in FF-CPT data interpretation could be due to the wide range of strain rates associated with the test.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Laboratory-Scale Free Fall Cone Penetrometer Test in Marine Clay with the Material Point Method

Mohapatra,

Saresma,

Virtalaso

et al. 2023

VIII International Conference on Particle-Based Methods

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This paper shows a numerical replication of a laboratory-scale free fall cone penetrometer test of marine clay. The numerical simulation involves large deformations and considers the destructuration of clay, strain rate effects, and non-linear material behaviour. The numerical simulation well replicates the laboratory experiment captured on a high-speed camera. The penetration process is replicated accurately in time, and the depth of the penetration corresponds to that obtained in an experiment. The simulation results indicate that the numerical framework implemented in Uintah software, consisting of an advanced soil model and the Generalized Interpolation Material Point Method, is well-suited for replication of the dynamic penetration process in soft and sensitive marine clay.

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Free-Falling Penetrometers: A Laboratory Investigation in Clay

Cited by 16 publications

References 21 publications

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Advances in Projectile Penetration Mechanism in Soil Media

Numerical Simulation of a Laboratory-Scale Free Fall Cone Penetrometer Test in Marine Clay with the Material Point Method

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