Temperature Effect on Preconsolidation Pressure

Drnevich, PV; Tidfors, M; Sällfors, Göran

doi:10.1520/gtj10679j

Cited by 110 publications

(19 citation statements)

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“…Substituting (16) into (15), the hard rock damage constitutive equation considering thermal effects is obtained (after the damage threshold point):…”

Section: Rock Damage Deterioration Statistical Constitutivementioning

confidence: 99%

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A Statistical Constitutive Model considering Deterioration for Brittle Rocks under a Coupled Thermal-Mechanical Condition

Gao

Wei

et al. 2018

Geofluids

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Due to active actions of groundwater and geothermal, the stability of underground engineering is important during geological structure active area. The damage mechanical theory and statistical mesoscopic strength theory based on Weibull distribution are widely used to discuss constitutive behaviors of rocks. In these theories, a statistical method is used to capture mesoscopic properties of rocks in order to generate a realistic behavior at a macroscopic scale. Based on the above theories, this paper aims at establishing a constitutive relation of brittle rocks under thermal-mechanical coupling conditions. First, a statistical damage constitutive model was established by considering the thermal effects and crack initiation strength. Subsequently, the parameters of the model were determined and expressed according to the characteristics of stress-strain curve. Third, the model was verified by conventional triaxial experiments under thermal-mechanical actions, and the experimental data and theoretical results were compared and analyzed in the case study. Finally, the physical meaning of the parameters and their effects on the model performance were discussed.

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“…Substituting (16) into (15), the hard rock damage constitutive equation considering thermal effects is obtained (after the damage threshold point):…”

Section: Rock Damage Deterioration Statistical Constitutivementioning

confidence: 99%

“…During the preceding four decades, various rock constitutive models have been established from theoretical, experimental approaches (e.g., [11][12][13][14][15]). Based on the traditional continuum mechanics and damage theory, thermoplastic and thermoelastic brittle models were proposed [16,17].…”

Section: Introductionmentioning

confidence: 99%

A Statistical Constitutive Model considering Deterioration for Brittle Rocks under a Coupled Thermal-Mechanical Condition

Gao

Wei

et al. 2018

Geofluids

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“…To, temperature; Du, pore-water pressure change; s 0 3c , initial consolidation pressure. Tidfors and Sällfors (1989) performed conventional incremental oedometer and constant rate of strain (CRS) tests on five clays from Sweden, three of which were marine clays. Temperature was varied between 7 and 50 8C.…”

Section: Figmentioning

confidence: 99%

“…6. Change in preconsolidation pressure versus liquid limit (Tidfors and Sällfors 1989). s 0 c , preconsolidation pressure; (Ds 0 c /10 8C)/(s 0 c ), change in preconsolidation pressure for every 10 8C divided by the preconsolidation pressure.…”

Section: Figmentioning

confidence: 99%

Effect of cold temperatures on properties of unfrozen Troll clay

Perkins

Sjursen

2009

Can. Geotech. J.

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Oedometer and triaxial experiments have been performed on North Sea Troll clay previously warmed to room temperature and tested at both room temperature and 0 8C to assess the effect of cold temperature on undrained strength and consolidation properties. In general, both the undrained strength and preconsolidation pressure increase as the temperature decreases. Many subsea areas of development in extreme northern or southern latitudes experience seafloor temperatures continuously around 0 8C. These results suggest that conventional laboratory testing at room temperature of samples from these areas leads to an underestimation of strength and preconsolidation pressure. Therefore, additional testing is recommended to assess the effect of a warming and cooling cycle on strength and consolidation properties, as previous work suggests that some consolidation is induced by this temperature cycle and may be responsible for the ensuing strength gain.Résumé : Des essais oedométriques et triaxiaux ont été effectués sur de l'argile « North Sea Troll » préalablement chauffée à la température ambiante et à 0 8C pour évaluer l'impact de la température froide sur la résistance non drainée et les propriétés de consolidation. De façon générale, il a été observé que la résistance non drainée et la pression de préconsoli-dation augmente à mesure que la température diminue. Plusieurs zones de développement sous-marin dans les latitudes extrêmes au nord et au sud subissent des températures au fond de la mer autour de 0 8C continuellement. Ces résultats suggèrent que les essais conventionnels au laboratoire à la température ambiante effectués sur des échantillons de ces zones entraînent une sous-estimation de la résistance et de la pression de préconsolidation. Ainsi, des essais supplémentaires sont recommandés pour évaluer l'impact des cycles de réchauffement et de refroidissement sur la résistance et les proprié-tés de consolidation, puisque des travaux antérieurs ont montré qu'une partie de la consolidation est induite par ces cycles de température et peuvent être responsables du gain de résistance subséquent.

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“…Many existing models are based on correlations between temperature and preconsolidation pressure. Owing to the uncertain nature of soils, the pre-consolidation pressure measured from parallel isothermal compression tests may suffer from indistinct trends, and repetition may be required (Tidfors and Sällfors, 1989;Eriksson, 1992). Meanwhile, the thermal elastic behavior was not considered in many thermal visco-plastic models (Laloui et al, 2008;Zhu and Qi, 2018).…”

Section: Introductionmentioning

confidence: 99%

A New One-Dimensional Thermal Elastic-Viscoplastic Model for the Thermal Creep of Saturated Clayey Soils

Chen

Yin

2023

J. Geotech. Geoenviron. Eng.

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Temperature significantly affects the mechanical properties of geomaterials, particularly the creep behavior of soft clayey soils. Thus, an appropriate constitutive model to describe the time-dependent stress-strain behavior of clayey soils at various temperatures is necessary. This study performed temperature-controlled oedometer tests on two clayey soils: the Hong Kong marine deposit (HKMD) and kaolinite clay. The thermally-induced strain and creep strain rates under different temperature paths were investigated and discussed. A novel onedimensional (1D) thermal elastic visco-plastic (TEVP) model was developed based on Yin and Graham's 1D elastic visco-plastic (EVP) model. In the proposed model, the visco-plastic strain rate of soils can be described using three state variables: effective stress, strain, and temperature.The proposed model can be implemented in creep analysis conveniently with the equivalent time concept. The prediction results of the TEVP model were consistent with the experimental data for HKMD and kaolin.

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Temperature Effect on Preconsolidation Pressure

Cited by 110 publications

References 0 publications

A Statistical Constitutive Model considering Deterioration for Brittle Rocks under a Coupled Thermal-Mechanical Condition

A Statistical Constitutive Model considering Deterioration for Brittle Rocks under a Coupled Thermal-Mechanical Condition

Effect of cold temperatures on properties of unfrozen Troll clay

A New One-Dimensional Thermal Elastic-Viscoplastic Model for the Thermal Creep of Saturated Clayey Soils

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