Compaction Bands and Oedometric Testing in Cemented Soils

Arroyo, Marcos; Castellanza, Riccardo; Nova, Roberto

doi:10.3208/sandf.45.2_181

Cited by 36 publications

(26 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increasing number of experimental studies have reported compaction localization in carbonates (Arroyo, Castellanza, & Nova, ; Baxevanis et al, ; Cilona et al, , ) but to date, the link between these results and the field examples (Tondi et al, ; Rustichelli et al, ; Rotevatn et al, ) remains unclear. Our new AE location data on SML show without ambiguity that compaction localization occurred in this rock.…”

Section: Discussionmentioning

confidence: 99%

Inelastic Compaction in High‐Porosity Limestone Monitored Using Acoustic Emissions

et al. 2017

View full text Add to dashboard Cite

We performed a systematic investigation of mechanical compaction and strain localization in Saint‐Maximin limestone, a quartz‐rich, high‐porosity (37%) limestone from France. Our new data show that the presence of a significant proportion of secondary mineral (i.e., quartz) did not impact the mechanical strength of the limestone in both the brittle faulting and cataclastic flow regimes, but that the presence of water exerted a significant weakening effect. In contrast to previously published studies on deformation in limestones, inelastic compaction in Saint‐Maximin limestone was accompanied by abundant acoustic emission (AE) activity. The location of AE hypocenters during triaxial experiments revealed the presence of compaction localization. Two failure modes were identified in agreement with microstructural analysis and X‐ray computed tomography imaging: compactive shear bands developed at low confinement and complex diffuse compaction bands formed at higher confinement. Microstructural observations on deformed samples suggest that the recorded AE activity associated with inelastic compaction, unusual for a porous limestone, could have been due to microcracking at the quartz grain interfaces. Similar to published data on high‐porosity macroporous limestones, the crushing of calcite grains was the dominant micromechanism of inelastic compaction in Saint‐Maximin limestone. New P wave velocity data show that the effect of microcracking was dominant near the yield point and resulted in a decrease in P wave velocity, while porosity reduction resulted in a significant increase in P wave velocity beyond a few percent of plastic volumetric strain. These new data highlight the complex interplay between mineralogy, rock microstructure, and strain localization in porous rocks.

show abstract

Section: Discussionmentioning

confidence: 99%

Inelastic Compaction in High‐Porosity Limestone Monitored Using Acoustic Emissions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The DEM model in this study can be extended into 3-D conditions, as well as in other areas such as strain localization analysis of naturally microstructured sands and its compaction band analysis [69]. The results can be useful to further understand constitutive models for bonded material, e.g.…”

Section: Discussionmentioning

confidence: 99%

A simple and efficient approach to capturing bonding effect in naturally microstructured sands by discrete element method

Jiang

Leroueil

2006

Numerical Meth Engineering

101

View full text Add to dashboard Cite

SUMMARYA discrete element modelling of naturally microstructured sands is very important to geomechanics. This paper presents a simple discrete element model for naturally microstructured sands with the aim to efficiently capture the effect of cementation between particles (bonds). First, a simple bond contact model was proposed by introducing a rigid-plastic bond element into the conventional contact model for dry granular material. Second, efficient numerical techniques were investigated to implement this contact model into the distinct element method (DEM). Then, a two-dimensional DEM code was developed to simulate a series of isotropic compression tests on the materials of different densities and bonding strengths. The study shows that the DEM model is able to capture the main features of naturally microstructured sands, such as variations of yielding and bulk modulus against bonding strength or material density. In addition, it is shown that the gross yielding (the yielding defined in terms of strains) is largely related to bond breakage; Coop and Willson criteria are generally reasonable; and the strong bonding in the experimental data obtained by Rotta et al. comes from that their bonded materials start at different points on the same compression line.

show abstract

“…As is well known, the mechanical behaviour of very porous cemented granular materials, like calcarenites, at high stress levels, is dominated by a damage process during which a progressive breakage of bonds (Lerouel and Vaughan, 1990;Lagioia and Nova, 1995;Porbaha, 1998;Liu and Carter 2003;Horpibulsuk et al,2004a;Horpibulsuk et al 2004b;Arroyo et al, 2005;Horpibulsuk, 2005;Castellanza et al, 2009;Nova and Parma, 2011;Cucino et al 2012) takes place. To reproduce, at a macro-scale level, the mechanical behaviour of these materials, strain-softening elastic-plastic constitutive relationships (Gens and Nova, 1993;Lagioia and Nova;1995;Nova et al, 2003), in which the presence of bonds is accounted for by introducing suitable internal variables, are usually employed.…”

Section: The Constitutive Relationshipmentioning

confidence: 95%

“…In contrast, they have been arbitrarily chosen to ideally simulate the mechanical response of a calcarenite. Their values are listed in Table 2 where, as was demonstrated by Olsson (1999) and Arroyo et al(2005), the axial stiffness vanishes.,…”

Section: The Constitutive Relationshipmentioning

confidence: 96%

Numerical and theoretical analysis of compaction banding in highly porous cemented materials

Dattola

Prisco

Gerolymatou

2015

International Journal of Solids and Structures

View full text Add to dashboard Cite

In this paper, the mechanically induced compaction process in highly porous cemented materials is tackled and, in particular, the mechanical response of a cylindrical sample oedometrically loaded is numerically simulated. The results of the numerical campaign, performed by using a self-made finite element code, in which a non-local elasto-plastic strain softening constitutive relationship has been implemented, are discussed.The influence on the numerical results of both the characteristic length size and the initial defect spatial distribution has been analysed.If a local version of the constitutive model is employed, the localization takes place randomly: multiple compaction bands develop within the sample. The unique way of inducing a spatial propagation of the compaction band is to introduce a linear distribution of the initial defect. The numerical solution is mesh-dependent and for sufficiently large values of the number of elements, the numerical solution becomes unstable. This instability, commented and theoretically justified by employing a simple 1D rheological model, is interpreted as a consequence of the snap-back phenomenon, which is affected by both geometrical and mechanical parameters.In contrast when the non-local version of the constitutive model is employed, the compaction band numerically observed propagates progressively within the sample until the material is completely damaged. Solely in case the defect is randomly distributed within the sample and its size is sufficiently large, compaction band propagation is inhibited and numerical stability is lost.

show abstract

Compaction Bands and Oedometric Testing in Cemented Soils

Cited by 36 publications

References 29 publications

Inelastic Compaction in High‐Porosity Limestone Monitored Using Acoustic Emissions

Inelastic Compaction in High‐Porosity Limestone Monitored Using Acoustic Emissions

A simple and efficient approach to capturing bonding effect in naturally microstructured sands by discrete element method

Numerical and theoretical analysis of compaction banding in highly porous cemented materials

Contact Info

Product

Resources

About