Undrained Shear Behavior of Cement Admixed Clay at High Water Content

Horpibulsuk, Suksun; Miura, N; Bergado, Dennes T.

doi:10.1061/(asce)1090-0241(2004)130:10(1096)

Cited by 191 publications

(61 citation statements)

References 19 publications

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“…This is attributed to strain softening caused by the crushing of soil-cementation structure. It has been observed that unlike reconstituted soils soft clay with strong cementation exhibits strong softening behavior in undrained situation in both normally consolidated and over consolidated states (Horpibulsuk et al, 2004b;Suebsuk et al, 2011). With time, the excess pore pressure decreases toward the cracked soil-cement column, which acts as the drain.…”

Section: Discussionmentioning

confidence: 99%

“…The strain softening of the soil-cement column is caused by the crushing of soil-cementation structure (Miura et al, 2001;Horpibulsuk et al, 2004b;Horpibulsuk et al, 2005;Horpibulsuk et al, 2010;andSuebsuk et al 2010 and2011). The failure vertical stress on the column measured from the EPC was 1400 kPa, which is slightly higher than the unconfined compressive strength.…”

Section: Consolidation Behavior Of the Model Composite Groundmentioning

confidence: 99%

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Consolidation behavior of soil–cement column improved ground

Horpibulsuk

Chinkulkijniwat

Cholphatsorn

et al. 2012

Computers and Geotechnics

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Columnar inclusion is one of the effective and widely used methods for improving engineering properties of soft clay ground. This article investigates the consolidation behavior of composite soft clay ground using physical model tests under an axial-symmetry condition and finite element simulations by PLAXIS 2D program. It is found out that the final settlement and the rate of consolidation of the composite ground depend on the stress state (of what ?). For an applied stress much lower than the failure stress, the final settlement of the ground is insignificant and the consolidation is fast. When the soil-cement column fails, the stress on column suddenly decreases (due to strain-softening) meanwhile the stress on soil increases to maintain the force equilibrium. Consequently, the excess pore pressure in the surrounding clay increases immediately. The cracked soil-cement column acts as a drain, accelerating the dissipation of the excess pore pressure. The consolidation of the composite ground is mainly in vertical direction and controlled by the area ratio, the ratio of diameter of soil-cement column to the diameter of composite ground, a . The stress on column is low for the composite ground with high value of a , resulting in less settlement and fast consolidation. ) obtained from the physical model test on the composite ground can be used to approximate the rate of consolidation. This approximation is validated via the finite element simulation. The proposed method is highly useful for geotechnical engineers because of its simplicity and reliable prediction.

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Section: Discussionmentioning

confidence: 99%

Section: Consolidation Behavior Of the Model Composite Groundmentioning

confidence: 99%

Consolidation behavior of soil–cement column improved ground

Horpibulsuk

Chinkulkijniwat

Cholphatsorn

et al. 2012

Computers and Geotechnics

Self Cite

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“…Suebsuk et al (2010) proposed a constitutive model based on the structured Cam clay (SCC) model to simulate the mechanical behaviors of cemented clay. Horpibulsuk et al (2004) pointed out that the cohesive effect of cemented clay can strongly hinder the process of shear strain. With respect to frozen saline soil, the cementation effect is weakened due to the melting of ice under relatively high pressure, the so-called "pressure melting" (Fish 1991;Ma et al 1999).…”

Section: Modification For Generalized Effective Hydrostatic Pressurementioning

confidence: 99%

A strength criterion for frozen sodium sulfate saline soil

2016

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Salt content has been proven to be an important influencing factor on the mechanical properties of frozen saline soils, whose strength criterion is different from that of unfrozen saline soils or frozen soils without salts. In this paper, a series of conventional triaxial tests are carried out for frozen saline soils with sodium sulfate at a temperature of -6°C. A strength criterion of the frozen saline soils, including the influence of salt content, is established by using the generalized nonlinear strength theory. Based on conventional triaxial test results, a modified hydrostatic pressure expression is proposed according to the critical strength function of the modified Cam clay model in the meridian plane. The influence of salt content on the shear strength of the frozen saline soils is investigated according to their freezing temperature curves as well as the formation of salt and ice crystals. The relationship between salt content and friction angle is analyzed. The proposed strength criterion of frozen saline soil is proved to be reliable by extrusion elongation triaxial tests. This criterion can reasonably reflect the major nonlinear strength characteristics of frozen saline soils, including the influences of change in salt content, pressure melting, and ice crushing.Key words: sodium sulfate, frozen saline soil, strength criterion, freezing temperature, deviatoric plane.Résumé : La teneur en sel est avérée être un facteur d'influence importante sur les propriétés mécaniques des sols salins congelés, dont son critère de résistance est différent de celle des sols salins dégelés ou des sols gelés sans sels. Dans cet article, une série d'essais triaxiaux classiques sont effectués pour les sols salins congelés avec du sulfate de sodium à la température de -6°C. Un critère de résistance de sols salins congelés, y compris l'influence de la teneur en sel, est établi en utilisant la théorie généralisée de la résistance non linéaire. Sur la base de résultats d'essais triaxiaux classiques, une expression de pression modifiée hydrostatique est proposée, conformément à la fonction de la résistance critique du modèle Cam clay modifié dans le plan méridien. L'influence de la teneur en sel sur la résistance au cisaillement des sols salins congelés est étudiée en fonction de leurs courbes de température de congélation, et aussi la formation de cristaux de glace et de sel. La relation entre la teneur en sel et l'angle de frottement est analysée. Le critère de la résistance proposé de sol salin congelé est prouvé fiable par des essais triaxiaux d'allongement par extrusion. Ce critère peut raisonnablement refléter les principales caractéristiques de résistance non linéaire des sols salins congelés, y compris les influences de l'évolution de la teneur en sel, de la fusion et du broyage de glace sous pression. [Traduit par la Rédaction] Mots-clés : sulfate de sodium, sols salins congelés, critère de résistance, température de congélation, plan déviatorique.

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“…The main strength source of SDM is from cementation bonds (Horpibulsuk et al, 2004). To evaluate the performance of PM as a curing agent for the solidification of DMs, soil samples were mixed with different percentages (by weight of the soil) of PM (i.e.…”

Section: Specimen Preparation and Testing Proceduresmentioning

confidence: 99%

“…Solidification of soft clayey soils including marine clayey DMs by using cement, to create improved materials with better geotechnical properties, has proved to be effective and sustainable (e.g. Bergado et al, 1996;Uddin et al, 1997;Tremblay et al, 2001;Horpibulsuk et al, 2003Horpibulsuk et al, , 2004Lorenzo and Bergado, 2004;Kasama et al, 2006;Åhnbergh, 2007). Nevertheless, it has been emphasized by a number of studies (e.g., Nagaraj and Miura, 2001;Sasanian 2011) that the available data obtained from certain types of clay cannot be confidently and readily applied to other types of soils, such as dredged marine silty soils.…”

Section: Introductionmentioning

confidence: 99%