An Advanced Critical State Constitutive Model for Overconsolidated Structured Soils

Liu, Wenhua; Hong-yong, Zhang; Li, Wugang; Kong, Gangqiang; Lin, Xin-yi

doi:10.1061/(asce)gm.1943-5622.0002349

Cited by 6 publications

(8 citation statements)

References 35 publications

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“…The reason for this is that the preconsolidation pressure experienced by overconsolidated soil results in a more stable soil structure, allowing the soil skeleton to withstand greater deviator stress, leading to higher strength in the samples. 44 Previous researchers also discovered that the shear strength of the hydrate-bearing and hydrate-free sediments in SCS increases with the increase of OCR, 42,45 with the results compared shown in Figure 10. The main reasons for the differences in strength values between hydrate-free sediments and OSLs of SCS in this study are as follows: Given the unique geographical characteristics of the SCS region, the stress history of the OSLs is complex and regionspecific.…”

Section: Influence Of Effective Stressmentioning

confidence: 79%

“…As the OCR increases, the failure strength of the samples gradually increases, demonstrating a positive correlation between the two. The reason for this is that the preconsolidation pressure experienced by overconsolidated soil results in a more stable soil structure, allowing the soil skeleton to withstand greater deviator stress, leading to higher strength in the samples …”

Section: Resultsmentioning

confidence: 99%

“…In general, there is a positive correlation between the values of E 50 and the values of the OCR, with E 50 increasing as the value of the OCR increases. The primary reason for this phenomenon is that the increase in OCR leads to a denser arrangement of soil particles, which effectively enhances the soil’s resistance to deformation and, consequently, increases the stiffness of the soil layer …”

Section: Resultsmentioning

confidence: 99%

“…The primary reason for this phenomenon is that the increase in OCR leads to a denser arrangement of soil particles, which effectively enhances the soil's resistance to deformation and, consequently, increases the stiffness of the soil layer. 44 3.3. Influence of Porosity.…”

Section: Influence Of Effective Stressmentioning

confidence: 99%

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Undrained Mechanical Properties of Overlying Soils of Gas Hydrate Reservoirs in the South China Sea

Liu,

Wang

et al. 2024

Energy Fuels

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Gas hydrate resources are abundant in the South China Sea (SCS), primarily occurring in clayey-silty reservoirs. However, the process of natural gas hydrate (NGH) extraction can lead to the destruction of cementation structures, the reduction of the bearing capacity, and the deformation of both the hydrate reservoir and its overlying soil layers (OSLs), ultimately causing engineering geological hazards such as seabed landslides. Therefore, before achieving commercial exploitation of NGHs, a comprehensive grasp of the mechanical characteristics of NGH reservoirs and their OSLs is imperative. However, most of the research on the safety of hydrate exploitation focuses on the mechanical properties of the hydrate reservoirs while overlooking the stability of OSLs, especially the undrained mechanical properties of OSLs. Based on this, this study investigates the undrained mechanical characteristics of the OSLs of NGH reservoirs in SCS under the influence of multiple parameters. The findings suggest that the strength and modulus of the OSLs of NGH reservoirs in the SCS are positively correlated with effective confining pressure, shear rate, and overconsolidation ratio but negatively correlated with porosity. Moreover, an increase in the effective stress and porosity enhances the strain-hardening and shearcontraction characteristics of the OSLs. Therefore, during hydrate extraction, locations within the OSLs characterized by a shallower burial depth, lower OCR, and higher porosity are more susceptible to failure, and it is advisable to select the NGH reservoir with a deeper burial depth, smaller porosity, and higher OCR. The conclusions of this study will contribute to the establishment of the constitutive relationship of the OSLs of NGH reservoirs in the SCS and provide a theoretical basis for reservoir stability during hydrate extraction processes.

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Section: Influence Of Effective Stressmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of Effective Stressmentioning

confidence: 99%

See 2 more Smart Citations

Undrained Mechanical Properties of Overlying Soils of Gas Hydrate Reservoirs in the South China Sea

Liu,

Wang

et al. 2024

Energy Fuels

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“…Natural soils typically exhibit structural characteristics. The presence of soil structure leads to significant differences in the mechanical properties of natural structured soils and remolded soils [1,4,5,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of artificially structured soil and Binary-medium-based constitutive model under undrained conditions

Li,

Liu,

2024

PLoS ONE

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To investigate the mechanical properties and constitutive models of structured soil under undrained conditions, triaxial compression tests on initially anisotropic structured soil, isotropic structured soil, and remolded soil were conducted under consolidation undrained conditions at confining pressures of 25, 50, 100, and 200 kPa, respectively. The results demonstrate that the samples of structured soils with strong structural characteristics have an obvious yield strength when the consolidation stress is low. At this time, the pore water pressure in structured soils increases at the beginning of loading. As the axial strain increasing, it turns to reduce. When failure, the samples have obvious shear band. With the consolidation stress increases, the mechanical properties and deformation mechanism of structured soils are near to the remolded soil. Combining the Binary-medium theory with the analysis and discussion of the mechanical properties and deformation mechanisms of structured soil, the rationality of the corresponding Binary-medium model was verified, which shows that the constitutive model can reflect the characteristics of dilatancy and strain softening, volumetric contraction and strain hardening under the conditions of low and high confining pressure respectively. At the same time, the constitutive model can also reflect the differences in the stress-strain characteristics of the two structural soils caused by the structural differences. In general, the results agree with the experiment relative well.

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The influences of natural structure damage and stress path on mechanical behaviors of soft clay

Liang

Sun

Huang

et al. 2023

Bull Eng Geol Environ

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An Advanced Critical State Constitutive Model for Overconsolidated Structured Soils

Cited by 6 publications

References 35 publications

Undrained Mechanical Properties of Overlying Soils of Gas Hydrate Reservoirs in the South China Sea

Undrained Mechanical Properties of Overlying Soils of Gas Hydrate Reservoirs in the South China Sea

Mechanical properties of artificially structured soil and Binary-medium-based constitutive model under undrained conditions

The influences of natural structure damage and stress path on mechanical behaviors of soft clay

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