Impact of Plastic Compression on the Small Strain Shear Modulus of Unsaturated Silts

Khosravi, Arezoo; Rahimi, Mehrzad; Gheibi, Amin; Shahrabi, Mohammad Mahdi

doi:10.1061/(asce)gm.1943-5622.0001031

Cited by 26 publications

(7 citation statements)

References 32 publications

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“…An interesting observation is that in the range of axial stresses applied, the slopes of the VCLs for unsaturated specimens were either parallel to that of the saturated soil specimen or slightly diverged. This was consistent with the compression curves for compacted Bonny silt specimens tested by Coccia & McCartney (2016) and Khosravi et al (2018). This observation is not consistent with the hypothetical compression curves in Figure 1…”

Section: Resultssupporting

confidence: 51%

“…However, most previous studies on the compression response of unsaturated soils focused on the hydro-mechanical behavior of compacted soils (e.g., Wheeler & Sivakumar 1995;Sharma 1998;Maâtouk et al 1995;Rampino et al 1999;Al-Mukhtar et al 1999;Lloret et al 2003;Cuisinier & Masrouri 2005;Jotisankasa et al 2007;Thu et al 2007;Uchaipichat & Khalili 2009;Coccia & McCartney 2016;Khosravi et al 2016Khosravi et al , 2018Mun & McCartney 2017). It is well accepted from the results of these studies that an increase in suction will lead to an increase in apparent yield stress, a feature that has been incorporated into most constitutive models for unsaturated soils (e.g., Alonso et al 1990;Wheeler & Sivakumar 1995;Cui et al 1995;Bolzon et al 1996;Gallipoli et al 2003;Sheng et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…It is well accepted from the results of these studies that an increase in suction will lead to an increase in apparent yield stress, a feature that has been incorporated into most constitutive models for unsaturated soils (e.g., Alonso et al 1990;Wheeler & Sivakumar 1995;Cui et al 1995;Bolzon et al 1996;Gallipoli et al 2003;Sheng et al 2008). However, the soil structure induced by compaction may also affect the yield stress, especially for the case that specimens are compressed after being compacted to different gravimetric water contents (e.g., Mun & McCartney 2017) instead of the case when different suctions are imposed after compaction (e.g., Uchaipichat & Khalili 2009;Coccia & McCartney 2016;Khosravi et al 2016Khosravi et al , 2018 or when specimens are wetted or dried after compaction and the suction is monitored (Jotisankasa et al 2007). Soil specimens compacted at gravimetric water contents on the dry side of optimum will have a flocculated structure due to the formation of aggregates of fine particles, while soil specimens compacted at gravimetric water contents wet of optimum will have a dispersed structure where particles are aligned (e.g., Mitchell et al 1965;Ahmed et al 1974, Delage et al 1996.…”

Section: Introductionmentioning

confidence: 99%

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Compression Response of Sedimented Unsaturated Soils

Behbehani

McCartney

2022

J. Geotech. Geoenviron. Eng.

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This paper presents an experimental study on the hydro-mechanical behavior of unsaturated sedimented soil to understand the impacts of suction on the apparent yield stress and gain insight into the differences in behavior from compacted soils. A large-strain oedometer was developed for use in a triaxial cell that permits initial sedimentation of soils from a slurry under backpressure, suction control using the axis translation technique, and mechanical loading to characterize the compression curve. A flow pump was used to control the pore water pressure at the base of the soil specimen and to track water flow during suction application and mechanical loading. After initial consolidation of saturated soil specimens from a slurry, the specimens were unloaded, different suction values were applied, then the axial stress was increased to 11 MPa at a constant strain rate. An increase in apparent yield stress with suction was observed, and the compression curves for higher suctions diverged without reaching pressurized saturation in the applied stress range. When compared with compression curves for the same soil compacted dry of optimum presented in previous studies, the sedimented soil had a greater yield stress at saturated conditions but a similar increase in yield stress with suction. Sedimented soils also experienced smaller changes in void ratio with applied net stress and a higher air entry suction value compared to compacted soils, reflecting a more compact soil structure. Suction was found to have a greater impact on yield stress than suction stress for both sedimented and compacted soils.

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Section: Resultssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compression Response of Sedimented Unsaturated Soils

Behbehani

McCartney

2022

J. Geotech. Geoenviron. Eng.

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“…Before freezing (i.e., cooling process), although all specimens had identical global water saturation of S = 30%, the evaporation-driven specimens showed the highest P - and S -wave velocities and the horizontally-layered specimens had the lowest velocities ( Figure 8 a,b). The associated phenomena showed that the capillary force between particles built in the unsaturated condition contributed to increased effective stress; however, the capillarity varied with water distribution patterns [ 18 , 19 , 20 , 21 , 22 ]. The test specimens were prepared in the same manner except for the water distribution patterns.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Small Strain Soil Stiffness during Freeze-Thaw Cycle: Transition from Capillarity to Cementation Examined Using Magnetic and Piezo Crystal Sensors

Park

Lee

Won

et al. 2021

Sensors

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Freeze-thaw cycles caused by seasonal temperature fluctuations significantly affect the geotechnical engineering properties. This study investigated the crucial role of water distribution patterns in the characterization of elastic wave properties for the fine F-110 sand during a freeze-thaw cycle. Sand specimens with four different water distribution patterns were prepared, namely homogeneously-mixed, evaporation-driven, vertically-, and horizontally-layered specimens. The P- and S-wave signatures of the specimens were monitored using piezo crystal sensors. Results indicated the criticality of water distribution patterns in the determination of small-strain soil properties even though the specimens had identical global water saturation. The nuclear magnetic resonance-based water volume depth profiles indicated that the evaporation-driven specimens had more heterogeneous pore-invasive ice-bonding layers at a high water saturation region; by contrast, the drying process facilitated uniform meniscuses around the particle contacts near the air percolation threshold. Elastic wave measurements for laboratory-prepared specimens might over/underestimate the small-strain soil stiffness of sediments in nature, wherein the drying processes prevailed to control the water saturation. This study highlighted a clear transition from capillary-controlled to cementation-controlled elastic wave properties during temperature oscillations.

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“…It was considered that suction increases in the cases studied with a higher level of depletion by the dewatering effect of the polyester material type. Khosravi et al [8] indicated that a hardening response in the test sample as the suction increase will, in turn, increase the shear modulus Gmax as the sample dries. Suction (pF) is the logarithm of the height of the water column (cm) to give the necessary suction.…”

Section: Effect Of Dewatering By Geosynthetic Materialsmentioning

confidence: 99%

Soft Clay Improvement Technique by Dewatering and Mixing Sandy Soil

Oye¹

2019

GEOMATE

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Treatment of soft clay is one of the problems in geotechnical engineering. A soil dredged from a pond is very soft because of high water content and possessing organic content. The soft soil is expected to be utilized as a geo-material. The purpose of this study is to investigate a cheaper, easier and environmentally friendly method in comparison with the conventional soil improvement methods for improving soft clay with low bearing capacity, low shear strength and excessive settlement. The proposed dewatering method was adopted to the soft clay collected from a pond in Kumamoto Prefecture, Japan. The functionality of this proposed method is thus, by inserting a geosynthetic material in the soft clay for dewatering and evaporation of excess water without energy. This is an effective, economical and low environmental impact method for dewatering because it does not require other resources such as chemicals using hardening agent or mechanical devices for dehydration with high pressure. In the experiment, it was found that Kumamoto clay with an initial water content of 1.5 times the liquid limit can be reduced to less than the liquid limit within a week by the proposed method. In addition to dewatering, sandy soil was mixed with the clay and cone penetration test was carried out. The effective mixing content of sandy soil for obtaining the target cone index was also evaluated.

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Impact of Plastic Compression on the Small Strain Shear Modulus of Unsaturated Silts

Cited by 26 publications

References 32 publications

Compression Response of Sedimented Unsaturated Soils

Compression Response of Sedimented Unsaturated Soils

Evolution of Small Strain Soil Stiffness during Freeze-Thaw Cycle: Transition from Capillarity to Cementation Examined Using Magnetic and Piezo Crystal Sensors

Soft Clay Improvement Technique by Dewatering and Mixing Sandy Soil

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