Modelling of expansive clay interaction with skeleton structures considering the effect of replacement permeability

Abdelmoneim, D; El-Taher, M; Akl, Sherif Adel; Elmamlouk, Hussein H.

doi:10.1016/j.asej.2020.10.011

Cited by 4 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among them, in terms of writing coupled seepage-soil deformation model, Wu and Vanapalli [4] developed five user material subroutines (USDFLD, UMAT, UMATHT, UEXPAN, FRIC) in ABAQUS, which were used for accessing and transmitting the stress and strain, and for calculating the stress-deflection, hydraulic behavior, expansive strains and pile-soil interface behavior, respectively. In terms of defining the wetswelling characteristics, IOP Publishing doi:10.1088/1755-1315/1330/1/012055 2 Shams and other scholars [5,6] considered the total strain of the soil as a superposition of the bulk variation due to moisture change and effective stress change, and defined soil as an elastic porous medium with wet swelling characteristic in order to study the structural deformation in expansive soils.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling bearing capacity in wetting unsaturated expansive soils

Yu,

Peng,

Qian

2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

To address the load-bearing deterioration of expansive soils uplift pile foundation after moisture absorption, a coupled seepage-soil deformation model for unsaturated expansive soils is implemented into ABAQUS. This modeling work consists primarily of two aspects: (1) The total strain of expansive soils has been decoupled into two parts, i.e., one caused by external loads and calculated by using Mohr-Coulomb plasticity model, and the other induced by wetting swelling and modeled by defining the moisture-swelling relation curve of expansive soils; (2) User-defined field subroutine (USDFLD) is developed by defining suction-dependent soil’s parameters (elastic modulus, cohesion and internal friction angle), and employed to simulate softening behaviors of expansive soils after moisture absorption. he above model is subsequently used to perform 3D finite element modeling and hydraulic-stress coupling analysis on the bearing capacity of pile in expansive soils before and after rainfall. Eventually, the proposed numerical method is validated by simulating a group of full-scale tests.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical modeling bearing capacity in wetting unsaturated expansive soils

Yu,

Peng,

Qian

2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Replacing a specific thickness of expansive soil, the moisture of which changes over time, with non-expansive soil reduces its swelling, so replacing the expansive soil under light structures is an effective and economical method [2]. It is also found that covering the expansive soil with a layer of specific thickness of non-expansive clayey soil greatly reduces its swelling, and reduces differential heave due to its low permeability [3].…”

Section: Introductionmentioning

confidence: 99%

“…The instructions state that the removal of the expansive soil should take place to a depth beyond which the soil moisture is constant. However, Abdelmoneim et al [3] noted that caution should be exercised or observed when replacing specific thicknesses of expansive soils with non-expensive soils because of their high or low permeability. In addition, due to their contribution to reducing heave to a great extent without problems, the most suitable soils to be applied for replacement are nonexpansive soils with low permeability.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of replacement method to improve unsaturated expansive soil

Alnmr

Ray

2023

Pollack

View full text Add to dashboard Cite

In this paper, a parametric study is done with various removal and replacement materials to study the effectiveness of the removal and replacement method on the wetting depth in the expansive soil and the amount of differential heave caused by climate conditions and common irrigation scenarios for the southern region of Syria. Soil suction changes and associated soil deformations are analyzed using finite element codes, VADOSE/W and SIGMA/W. The paper concludes that the optimum thickness for replacement with high permeability soil should be at least 1 m. In addition, it concludes that replacing soil with a permeability coefficient lower than the permeability coefficient of the site soil contributes to a 56% and 79% reduction in total and differential heave, respectively.

show abstract