Oedometer Behavior of an Artificial Cemented Highly Collapsible Soil

Medero, Gabriela M.; Schnaid, Fernando; Gehling, Wai Ying Yuk

doi:10.1061/(asce)1090-0241(2009)135:6(840)

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…Significant differences in the soil specific volume are observed during wetting and drying of soils [13][14][15][16][17][18]. Cycles of drying and wetting generate progressive shrinkage in clays and result in a change in fabric during drying, which weakens bonding and, as a consequence, degrades the soil structure [19].…”

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

“…Cycles of drying and wetting generate progressive shrinkage in clays and result in a change in fabric during drying, which weakens bonding and, as a consequence, degrades the soil structure [19]. Moreover, cycles of wetting and drying can exhibit hydraulic hysteresis [13,16], implying that two samples of the same soil subjected to the same value of suction (s, the difference between pore air pressure and pore water pressure) can be at significantly different values of degree of saturation (Sr) if one is on a drying path and the other is on a wetting path. Figure 7 presents a soil water retention curve (SWRC) of a soil illustrating hydraulic hysteresis [16].…”

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

“…Figure 7 presents a soil water retention curve (SWRC) of a soil illustrating hydraulic hysteresis [16]. Another important feature observed during cycles of wetting/drying is the occurrence of irreversible volume changes in the soil (e.g., collapse phenomenon) [13,14]. …”

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

“…Keeping in mind that just half of the wall/sample was submerged in water, the first flooding event caused an increase of the vertical height equivalent to 3% of the exposed height under water. The authors believe that this behavior happened because the wall/sample was not loaded (no vertical load was applied to the top of the sample), since it is show in the literature for non-existent or low vertical stresses that the earth/soil can present expansible behavior when wetted [13,17,18,21]. If a load would be introduced to the top of the wall, the authors believe that the wall/sample could present collapsible behavior (sudden reduction of volume by rearrangement of the particles) [14,15,21].…”

Section: Sr S = U a -U Wmentioning

confidence: 99%

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Flooding Effect on Earth Walls

et al. 2010

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Earth building is a sustainable, environmentally friendly and economical method of construction that has been used worldwide for many centuries. For the past three decades, earth has seen a revival as a building material for a modern construction method due to its benefits in terms of low carbon content, low cost and energy involved during construction, as well as the fact that it is a sustainable technology of building. Climate change is influencing precipitation levels and patterns around the world, and as a consequence, flood risk is increasing rapidly. When flooding occurs, earth buildings are exposed to water by submersion, causing an increase in the degree of saturation of the earth structures and therefore a decrease of the suction between particles. This study investigated the effect of cycles of flooding (consecutive events of flooding followed by dry periods) on earth walls. A series of characterization tests were carried out to obtain the physical and mechanical properties of the studied earth material. In a second stage, Flooding Simulation Tests (FST) were performed to explore the earth walls' response to repeated flooding events. The results obtained for the tested earth wall/samples with reinforced material (straw) reveal hydraulic hysteresis when wall/samples are subject to cycles of wetting and drying.

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Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

Section: Sr S = U a -U Wmentioning

confidence: 99%

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Flooding Effect on Earth Walls

et al. 2010

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“…The most common practice to measure the collapse potential is by conducting laboratory tests using either the oedometer test or the triaxial test. Medero et al suggested a sample preparation technique to produce a metastable collapsible soil, which was then used to investigate soil collapsibility. Medero et al observed that, for the same initial conditions, samples tested using the single oedometer test resulted in higher collapse potential than samples tested using the double oedometer test.…”

Section: Introductionmentioning

confidence: 99%

Modelling the behavior of inundated collapsible soils

Ashour

Abbas

Altahrany

et al. 2020

Engineering Reports

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The properties of collapsible soil exhibit a lot of sensitivity toward the increase of water content, especially when the soil is close to the dry state. The inundation of collapsible soils induces a considerable drop in the void ratio (e) (ie, collapse potential, Cp, increase), which in return affects the dry unit weight ( d ), friction angle ( ), and shear strength of the soil. The presented study employs large numbers of sandy and silty specimens of collapsible soils with different initial conditions (gathered from the literature) to develop a correlation that evaluates Cp of the soil (ie, settlement) due to inundation. The developed relationship accounts for the soil's initial properties such as the void ratio (e 0 ), degree of saturation (Sr), and pressure applied to the inundated specimens. The presented model reflects the significant influence of Sr on Cp of inundated soil which considerably decreases by the increase of Sr. The determined properties of inundated collapsed soil, such as e and , are employed to construct the post-inundation stress-strain curve (ie, mobilized shear strength) of the soil based on the concepts of the conventional triaxial test. Comparisons between predicted and measured stress-strain curves of inundated collapsible soils are presented for validation. K E Y W O R D Scollapse potential, collapsible soil, constitutive model, stress-strain curve INTRODUCTIONCollapsible soils or metastable soils are unsaturated soils that undergo a significant volume reduction upon saturation with or without additional load. Generally, collapsible soils maintain an open "honeycombed" structure that could have negative pore water pressure and cementing agents that result in considerable shear strength. As a result of wetting, effective stresses are reduced due to the dissipation of the negative pore water pressure. Furthermore, the water dissolves or softens the bonds between the particles, causing a reduction in shear strength, nonetheless a denser particle packing.Collapsible soils may exist in natural deposits as well as in man-made fills and have been under investigation for many years in a broad literature. El Howayek et al 1 investigated the susceptibility of man-made fills to undergo collapse by conducting experimental investigations on two loess soil types that were compacted to a wide range of values of relative compaction (RC). El Howayek et al 1 observed that even specimens compacted to approximately 90% RC on the dry side of the optimum moisture content experienced large wetting-induced strains. In general, El Howayek et al 1 concluded that the collapse potential increases with decreasing compaction water content, RC, and degree of saturation.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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