Hydromechanical Constitutive Model for Unsaturated Soils with Different Overconsolidation Ratios

Li, Wugang; Yang, Qing

doi:10.1061/(asce)gm.1943-5622.0001046

Cited by 22 publications

(6 citation statements)

References 32 publications

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“…The mechanics approach is based primarily on the work of Terzaghi (Terzaghi 1943) and Biot's theory (Biot 1941, Biot 1962). Many models have been developed using this approach, including unsaturated hydro-mechanical models (Sanavia et al 2002, Li andYang 2018), large-strain hydro-mechanical models (Meroi et al 1995), multiphase flow models (Edip et al 2018), and coupled thermo-hydro-mechanical-chemical models (Li et al 2006, Seetharam et al 2007. This approach has found to be useful when developing new models for specific applications (e.g., introducing formulations of other fields to the constitutive model) and has supported many practical areas of geomechanics and engineering.…”

Section: Introductionmentioning

confidence: 99%

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

Wang

Howlett

et al. 2022

Int. J. Geomech.

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Constitutive coupled modeling has developed rapidly in recent decades, with numerous new models published. However, few models consider dynamic porosity, and experimental validation of such a model remains a challenge due to multiple variables. In this study, a new constitutive model for unsaturated soil with dynamic porosity was developed and validated using test data from two experimental studies that yielded good results (relative average error AVRE = 0.8631-1.3046, R 2 = 0.9028-0.9981). The sensitivity of the model to the four primary parameters was analyzed to investigate the influence of model properties on the hydraulic and mechanical behavior. Results show that the calculation of volumetric strain is most sensitive to Young's modulus (E), while the calculation of specific water volume is most sensitive to permeability (k). Also, the sensitivity of the parameters changes with their value. Modeled results show that the porosity change significantly affects both hydraulic and mechanical behavior, even when soil undergoes relatively low deformation. Relative calculation error decreases notably after porosity change is considered (44.9% and 35.2% improvement in two different calculations). This study also finds that dynamic porosity affects the deformation energy of solids.

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Section: Introductionmentioning

confidence: 99%

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

Wang

Howlett

et al. 2022

Int. J. Geomech.

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“…Recently, many studies have been carried out to analyze the effect of wet/dry cycles on the deformation behavior and constitutive stress-strain of soil [15][16][17][18][19]. Furthermore, a number of researchers, such as Li et al 2019 [20], Li and Yang, 2018 [21], Guo et al 2021 [22], and Li et al 2020 [23], have studied the elastoplastic model of unsaturated soils, incorporating different influencing factors. However, the literature about the constitutive model of saturated soils considering the effect of the F-T cycle is relatively sparse.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic Model Framework for Saturated Soils Subjected to a Freeze–Thaw Cycle Based on Generalized Plasticity Theory

Cong

Ling

et al. 2021

Materials

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The failures of soil slopes during the construction of high-speed railway caused by the soil after the freeze–thaw (F–T) cycle and the subsequent threat to construction safety are critical issues. An appropriate constitutive model for soils accurately describing the deformation characteristics of soil slopes after the F–T cycle is very important. Few constitutive models of soils incorporate the F–T cycle, and the associated flow rule has always been employed in previous models, which results in an overestimation of the deformation of soil exposed to the F–T cycle. Generalized plasticity theory is widely used to predict the performance of geotechnical materials and is especially well adapted to deal with this type of generalized cyclic loading (such as a freeze–thaw cycle), and it overcomes the shortcomings of the associated flow rule that causes larger shear deformation. To this end, an elastoplastic model framework based on generalized plasticity theory with double yield surfaces for saturated soils subjected to F–T cycles was developed. Two types of plastic deformation mechanisms, i.e., plastic volumetric compression and plastic shear, were considered in this elastoplastic model. It was found that this model can accurately predict the mechanical behavior and deformation characteristics of saturated soils after F–T cycles.

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“…Gao et al [6] and Deng et al [1] conducted numerical simulations and physical model tests on a 2 MW wind turbine subjected to random wind loads. Currently, there are also many unsaturated constitutive models that can reasonably predict the mechanical behavior of unsaturated soils under monotonic loading, such as those proposed by Russell and Khalili [11] and Li and Yang [12]. e results demonstrated that the dynamic amplification factor strongly depends on the wind speed and spatial position and that the responses of the shallow foundation of a wind turbine are significantly affected by dynamic wind loads.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength Deterioration of Compacted Residual Soils under a Wind Turbine due to Drying‐Wetting Cycles and Vibrations

Zhou

Deng

Fan

et al. 2021

Advances in Civil Engineering

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The soil beneath a wind turbine withstands not only environmental impacts but also continuous vibrations transmitted from the superstructure. This paper presents an experimental study of the deterioration characteristics of shear strengths of residual soils affected by drying-wetting cycles and continuous vibrations. A series of triaxial tests were performed on compacted residual soil specimens after various drying-wetting cycles and vibrations. The influences of drying-wetting cycles and vibrations on the shear strengths of residual soils with different compaction degrees were analyzed. The results demonstrate that the shear strength and cohesion of compacted residual soils decreased as the number of drying-wetting cycles increased, and they tended to be stable after three drying-wetting cycles. The angle of internal friction decreased linearly with the reduction of compaction degree but was generally not affected by drying-wetting cycles. The shear strength of compacted residual soils also decreased because of continuous vibrations. After 10000 vibrations, the strength was stabilized gradually. Both the cohesion and angle of internal friction showed dynamic attenuation phenomenon. Finally, a modified Mohr–Coulomb strength equation considering the effects of drying-wetting cycles and vibrations was established. This equation could be used to predict the shear strength of compacted residual soils and further estimate the embedded depth of wind turbine foundations.

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Hydromechanical Constitutive Model for Unsaturated Soils with Different Overconsolidation Ratios

Cited by 22 publications

References 32 publications

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

Elastoplastic Model Framework for Saturated Soils Subjected to a Freeze–Thaw Cycle Based on Generalized Plasticity Theory

Shear Strength Deterioration of Compacted Residual Soils under a Wind Turbine due to Drying‐Wetting Cycles and Vibrations

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