Experimental characterization and numerical modeling of the self-weight consolidation of a dredged mud

Bargain, François; Corda, Gilles

doi:10.1016/j.gete.2021.100274

Cited by 4 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in the case of the dynamic mesh, the drainage boundary is always consistent with the top surface of the mesh, which corresponds to the real‐time height of the specimen. This aligns with the results reflected in the references 73 and 74.…”

Section: One‐dimensional Consolidation Testsupporting

confidence: 92%

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

He,

Li,

Chen

2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

The greatest challenge when performing large deformation simulations using the CFD‐DEM coupling method lies in the dynamical update of the fluid meshes. To address this problem, a novel CFD‐DEM coupling method integrated with the dynamic unstructured grid is proposed in this work. The mesh initialization and reconstruction are performed by the Constrained Delaunay triangulation (CDT) implemented by the tetgen algorithm. Moreover, the equation of state (EOS) is introduced to consider the impact of fluid compressibility. The reliability of this coupling method is preliminarily verified by the particle sedimentation test. Additionally, undrained triaxial shear and one‐dimensional consolidation tests are conducted to examine the applicability of the proposed method in simulating geotechnical cases. From our analysis, it is found that the shear responses in the undrained triaxial shear test obtained from the proposed method with dynamic mesh are in direct accordance with those led by the constant volume (CV) method. However, difficulties arise in accurately describing the moving boundary by the fixed mesh, leading to unreliable results. Moreover, in the one‐dimensional consolidation test, both the dynamic and fixed grids can capture the Mandel—Cryer effect, which is more pronounced under the dynamic grid, mainly due to the dual impact of the loading device and particle skeleton on the fluid. A greater compressibility specified under the dynamic grid led to a weakening of this effect, whereas its duration is increased. Our work provides valuable insights for effectively dealing with dynamic fluid boundaries.

show abstract

Section: One‐dimensional Consolidation Testsupporting

confidence: 92%

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

He,

Li,

Chen

2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…Recently, some studies have gradually shifted their focus to consolidation with large deformations and have mainly analyzed it in conjunction with Gibson's theory [17,18]. The theory takes into IOP Publishing doi:10.1088/1755-1315/1330/1/012018 2 account the nonlinear properties of the soil material and generalizes Terzaghi's theory for large strain conditions.…”

Section: Introductionmentioning

confidence: 99%

A novel CFD-DEM coupling method with moving boundary for simulating one-dimensional consolidation test

He,

Li,

Chen

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

The conventional CFD-DEM coupling method fails to dynamically modify the position of the drainage boundary during the simulation of one-dimensional consolidation tests (1d CT), resulting in inaccuracies in the numerical results. In this study, a novel CFD-DEM coupling method with moving boundaries is proposed to simulate 1d CT where the fluid boundary adaption and internal mesh reconstruction are implemented with reference to the real-time morphology of the consolidation specimen. Additionally, the convective terms in Navier-Stokes equations are modified to account for the moving drainage boundary and the equation of state (EOS) is introduced to consider fluid compressibility. A series of 1d CTs based on the traditional fixed boundary and the moving boundary are subsequently conducted for comparison. Moreover, the influence of fluid compressibility and mesh coarseness on the consolidation characteristics is briefly discussed. The proposed method is verified to serve well in revealing the underlying microscopic mechanism of the Mandel-Cryer effect and complementing the traditional consolidation theories.

show abstract

“…However, the adjustment of the empirical coefficient m s has been questioned in terms of its scientific rationality. For large-scale dredged-fill foundations, Zhang et al [18] claimed that if the water content of the sediment soil is less than the critical water content w c , at which consolidation settlement occurs, then the settlement can be calculated by the one-dimensional consolidation theory [19][20][21]. Otherwise, the batch sedimentation process will prevail in the soil, and the settlement should be calculated based on the sedimentation regularity.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the low-pressure consolidation characteristics of sediment soil have been extensively studied. For example, Loginov et al [22] discussed the low-pressure compression-permeability characteristics of a bentonite sediment based on a centrifuge model test [20,21,23]; Chen et al [24] claimed that the one-dimensional large strain consolidation of saturated soft materials that are deposited at very low density usually exhibits a time-variant compressibility relation and presents two modifications on two conventional equations for compressibility and permeability, but they did not propose a clear method for calculating the settlement considering low-pressure consolidation characteristics; Qin et al [25] proposed an analytical solution to estimate the settlement by considering the sedimentation and consolidation, but the analytical solution is only applicable to indoor model experimental studies because of the need to obtain the state specifications during the settling process. Apparently, the influence of batch sedimentation and low-pressure consolidation has not been fully considered in the existing settlement calculation methods of VPM-treated dredged-fill foundations.…”

Section: Introductionmentioning

confidence: 99%

Batch Settling and Low-Pressure Consolidation Behaviors of Dredged Mud Slurry: Steady-State Evaluation and Mechanism Study

Bao,

Guo,

Dong

et al. 2023

Water

View full text Add to dashboard Cite

Since the exploration of the characteristics of dredged mud slurry during batch settlement and low-pressure consolidation (less than 100 kPa) is still insufficient, the determination of the optimal time to start the vacuum preloading method (VPM) on dredged-fill foundations is still empirically oriented (due to a lack of enough scientific basis). To further explore the characteristics of dredged mud slurry during batch settlement and low-pressure consolidation, samples from typical dredged-fill land projects were obtained and used to conduct batch sedimentation model experiments and low-pressure (less than 100 kPa) consolidation tests. The results of experiments and analyses showed the following: (1) the clay (d < 0.005 mm) content is a main factor affecting the batch settlement and consolidation characteristics of dredged mud slurry, which is not conducive to the consolidation effect of dredged-fill foundations. (2) For dredged mud slurry whose clay content is within 40% to 60%, the cumulative change rate of the average porosity ratio of 60% to 75% is suitable for evaluating the steady state of its batch sedimentation process, i.e., the optimal starting time of VPM. Finally, based on the experimental analyses, a settlement prediction method that considers both the batch sedimentation and the low-pressure consolidation processes was developed and validated.

show abstract

Experimental characterization and numerical modeling of the self-weight consolidation of a dredged mud

Cited by 4 publications

References 29 publications

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

A novel CFD-DEM coupling method with moving boundary for simulating one-dimensional consolidation test

Batch Settling and Low-Pressure Consolidation Behaviors of Dredged Mud Slurry: Steady-State Evaluation and Mechanism Study

Contact Info

Product

Resources

About