Experimental Study on Shear Localisation in Granular Materials Within Combined Strain and Stress Field

Leśniewska, Danuta; Niedostatkiewicz, Maciej; Tejchman, J.

doi:10.1111/j.1475-1305.2012.00838.x

Cited by 14 publications

(6 citation statements)

References 30 publications

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“…More detailed analysis of Figure 7 shows the shear zone to actually be slightly curved and to have a finite thickness as shown in Figures 7(c) and 7(d), which present the maximum shear strains mobilised with translational wall displacements of 0.2% H and 1% H, respectively. The shear band previously observed for active translation at 1g by Lesniewska et al (2012) was straighter as with lower body forces the change in dilatancy across the height of the model is small, whereas in the centrifuge and at full-scale, self-weight leads to a substantial reduction in dilatancy with depth. A calculation for the entire image sequence indicates that the average slope of the shear zone increases gradually from 45° in the early stages to around 𝜃 inc .…”

Section: Sand Deformations With Wall Translationmentioning

confidence: 56%

Sand deformation mechanisms mobilised with active retaining wall movement

Deng

Haigh

2022

Géotechnique

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A series of centrifuge tests was conducted to explore the deformation mechanisms mobilised in loose and dense sand for a complete set of active rigid retaining wall movement modes: rotation about the base and top and translation. The sand deformation was measured by particle image velocimetry and data of displacements and strains are reported. A simplified deformation mechanism is proposed for sand behind a rigid wall rotating about the top and validated with the centrifuge test results. The paper reveals that the sand deformation caused by wall translation can be well characterised by the superposition of mechanisms with equal but opposite wall rotation about the top and base. Integration of these displacement mechanisms together with a constitutive law into an equilibrium solution for wall bending would allow designers to predict deformations during construction as well as ultimate collapse.

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Section: Sand Deformations With Wall Translationmentioning

confidence: 56%

Sand deformation mechanisms mobilised with active retaining wall movement

Deng

Haigh

2022

Géotechnique

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“…The size of localized zones is also affected by the accuracy of a measurement technique applied mainly due to an extremely low deformation level in cementitious bodies as compared to, e.g. granular bodies .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Fracture Process Using DIC in Plain and Reinforced Concrete Beams under Bending

Skarżyński

Tejchman

2013

Strain

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The fracture behaviour of concrete and reinforced concrete beams under quasi-static three-point bending was comprehensively investigated with experiments at laboratory scale. The eight various concrete mixes were tested. The influence of the shape, volume and size of aggregate particles and reinforcement on concrete fracture under bending was studied. Displacements on the surface of concrete beams were measured by means of the digital image correlation (DIC) technique. Attention was paid to the formation of a localized zone and its characteristics. In order to avoid the effect of the search patch size and the cut-off value at displacement and strain profiles, a consistent method was proposed to determine uniformly and accurately the width of a localized zone. Measured surface displacements from DIC were fitted by the error function ERF, whereas surface strains calculated from displacements were fitted by the usual normal distribution (Gauss) function. The width of a localized zone preceding a macro-crack grew strongly with increasing maximum aggregate size and slightly with diminishing aggregate volume. It did not depend on the aggregate roughness and reinforcement presence.

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“…Particle Image Velocimetry (PIV) technique was used to study the sand deformation pattern (e.g. Niedostatkiewicz et al, 2011;Leśniewska et al, 2012;Jackson, 2010) and the GeoPIV software (White et al, 2003, Stanier et al, 2016 was employed to perform the PIV analysis. A high-speed digital camera with a resolution of 3648 × 2736 pixels was used in the study and the patch size was set to 40 × 40 pixels, which offered a good compromise between precision and detail (number of measurement points).…”

Section: Methodsmentioning

confidence: 99%

Rate effects during ice scour in sand

Arnau

Ivanović

2019

Cold Regions Science and Technology

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This study is focused on the prediction of ice scour loads on a cohesionless seabed in saturated and dry conditions by means of reduced scale physical model testing. The influence of different soil parameters such as the soil permeability and the relative density have been studied in the laboratory under 1g conditions over a range of scouring depths, scouring widths and drifting velocities of an iceberg model. The effect of the drifting speed on the scouring loads was found to be important: a sandy seabed scoured by an iceberg with a mean drifting speed of 0.2 m/s can generate scour loads twice as large as the static loads at prototype scale. The methods used currently to predict ice scour loads consider only the static loads under drained conditions, lower bound, even though some of the methods have been calibrated or compared against experimental results under saturated conditions. In order to calculate the upper bound of the scour loads, the model described in this paper is proposed, which takes into account the undrained (or partly-undrained) responds of a sandy seabed.

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Experimental Study on Shear Localisation in Granular Materials Within Combined Strain and Stress Field

Cited by 14 publications

References 30 publications

Sand deformation mechanisms mobilised with active retaining wall movement

Sand deformation mechanisms mobilised with active retaining wall movement

Experimental Investigations of Fracture Process Using DIC in Plain and Reinforced Concrete Beams under Bending

Rate effects during ice scour in sand

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