An experimental investigation of the behaviour of artificially cemented soil cured under stress

Rosa, Francisco Dalla; Consoli, Nilo César; Baudet, BA

doi:10.1680/geot.2008.58.8.675

Cited by 51 publications

(3 citation statements)

References 18 publications

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“…P-wave measurements gave velocities that were strongly pressure dependent throughout the pressure range used for the unloaded samples (cored), whereas for the virgin samples the P-wave measurements were constant until stress levels far in excess of the curing stresses, indicating that the elastic stiffness was not pressure dependent. Also using artificial sandstones, but at lower stress levels, Fernandez & Santamarina (2001) have confirmed that unloading of a sand cemented under pressure can affect the elastic behaviour, but, in contrast, Dalla Rosa et al (2008) found that there was no significant effect of unloading on the large-strain behaviour that they examined. This paper describes the results of a more extensive investigation of the effects of unloading on the behaviour of weak sandstones that have been cemented at great depths.…”

Section: Introductionmentioning

confidence: 94%

On the role of bond breakage due to unloading in the behaviour of weak sandstones

Alvarado¹,

Coop²,

Willson³

2012

Géotechnique

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A laboratory investigation was made of the effects of isotropic unloading on the mechanical behaviour of cemented sandstones, modelling in a simple way the influence of sampling on hydrocarbon reservoir sandstones that have been cemented at depth. Artificial samples of sandstone were created by allowing a cement to hydrate while a sand sample was under a high confining stress in a triaxial apparatus. Comparisons were then made between the behaviour of samples that had been unloaded to zero confining stress with that of samples tested at stress levels around that during cementing. It was found that the isotropic unloading damaged the cement, which had a significant effect on the small-strain and yielding behaviour but not on the strength and large-strain behaviour. Comparisons were also made with tests on natural samples of reservoir and analogue sandstones, and it was found that the artificial sandstone had reproduced the key elements of their behaviour. The intrinsic properties of all of the sandstones tested were found to be similar, although there were significant differences in the peak strengths and gross yielding envelopes. Cement content was found not to be the sole factor that influenced the peak and gross yield envelopes, and significant anisotropy was also revealed in one sandstone.

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Section: Introductionmentioning

confidence: 94%

On the role of bond breakage due to unloading in the behaviour of weak sandstones

Alvarado¹,

Coop²,

Willson³

2012

Géotechnique

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“…The accuracy of the Vesic (1975) solution in predicting the ultimate bearing capacity of a footing resting on an artificially cemented upper layer, overlying a weakly bonded residual soil with a high void ratio, is unknown. The stress-strain-strength behavior of artificially cemented soils has been studied in the past by several investigators (e.g., Clough et al, 1981;Coop & Atkinson, 1993;Huang & Airey, 1998;Consoli et al, 2000Consoli et al, , 2006Consoli et al, , 2008Consoli et al, , 2009Consoli et al, , 2010Consoli et al, , 2011Consoli et al, , 2012Consoli et al, , 2013Consoli et al, , 2014Consoli et al, , 2015Consoli et al, , 2016Consoli et al, , 2017Consoli et al, , 2018Consoli et al, , 2019Consoli et al, , 2020aDalla Rosa et al, 2008). Foppa et al (2020) and Caballero (2019) observed, in small scale load tests of footings resting on a soil-cement reinforced layer over a loose sand, two distinct types of failure: in the first, the reinforcement layer is punched through the soil, without showing any fissuring, up to a settlement corresponding to the natural soil bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Spread footings bearing on circular and square cement-stabilized sand layers above weakly bonded residual soil

Consoli¹,

Festugato²,

Miguel³

2020

S&R

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The practice of soil-cement reinforced layers to bear shallow foundations is a feasible option in low bearing capacity soils. This paper addresses the interpretation of plate load tests bearing on compacted artificially cemented sand layers of distinct sizes and shapes (cylindrical and prismatic) overlaying a weakly bonded residual soil stratum. Static load tests were carried out on a rigid circular steel plate (diameter of 300-mm) resting on sand-cement reinforced layers with distinct areas (diameters/widths of 450, 600, and 900-mm) and constant thickness of 300-mm. The results have shown two distinct failure modes that rely on the cemented layer's diameter/width: (a) the steel plate and the artificially cemented layer punch together into the weakly bonded residual soil, without the failure of the cemented layer, and (b) the artificially cemented layer fails. The combination of two traditional methods for predicting bearing capacity in soils was successfully applied considering the shape (and geometry) of the improved layer and the existence (or not) of interaction of the lateral of the cemented layers and the residual soil. Finally, this study highlights the importance of considering the shapes and sizes of soil-cement layers in the bearing capacity estimation (combining analytical solutions) of spread footings resting on treated layers above weakly bonded residual soils.

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“…The treatment of soils with cement finds wide application in geotechnical engineering in the last decades. Behavior of cemented soil has been researched in many aspects [1,2,3,4], while, most of the research focus on the behavior of cemented soft soil. Behavior of cemented hard soil has seldom been studied.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Cemented Reticulate Red Clay

Zhuo

2012

AMR

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Mechanical properties of cemented reticulate red clay were studied in present research. Test results show that: (1) shear strength of cemented reticulate red clay increase exponentially as the increasing of cement content; (2) shear strength of cemented reticulate red clay decrease polynomially as the increasing of water content; (3) mechanical properties of cemented reticulate red clay affected significantly by curing time and curing confined pressure. In order to study viscous properties of cemented reticulate red clay, cemented reticulate red clay specimens were compressed in triaxial chamber at different shear rate. Results of the compression tests show that it is obvious that the axial strain-deviator stress relationship of cemented reticulate red clay affects by the strain rate.

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An experimental investigation of the behaviour of artificially cemented soil cured under stress

Cited by 51 publications

References 18 publications

On the role of bond breakage due to unloading in the behaviour of weak sandstones

On the role of bond breakage due to unloading in the behaviour of weak sandstones

Spread footings bearing on circular and square cement-stabilized sand layers above weakly bonded residual soil

Behavior of Cemented Reticulate Red Clay

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