Method for Calculating the Edge Moisture Variation Distance

El-Garhy, Basuony; Wray, W. K.

doi:10.1061/(asce)1090-0241(2004)130:9(945)

Cited by 16 publications

(10 citation statements)

References 4 publications

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“…El-Garhy et al [20][21][22][23][24] have been developed a program called SUCH to calculate the 3D distorted mound shape underneath a flexible impermeable cover due to the movements in the expansive soil (shrinkage or heave). The SUCH model has been described and validated in a series of published papers.…”

Section: Computer Program Suchmentioning

confidence: 99%

“…The program SUCH using the finite difference method, FDM, to solve the suction diffusion equation in 3D to estimate the changes in soil suction within the expansive soil underneath a flexible impermeable cover with time and the associated movements (shrink or heave) due to the changes in the climatic condition. Other edge effects, such as vertical barrier, horizontal barrier, water collects in a pond, and large trees, can be considered by the program [22,24]. The water movement in the expansive soil mass was based on Mitchell's suction diffusion equation [25] and the soil movements (shrink or heave) calculation was based on Wray's model [26].…”

Section: Computer Program Suchmentioning

confidence: 99%

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Estimating the Climate-Controlled Soil Parameters and the Distorted Mound Shape for Analysis of Stiffened Rafts on Expansive Soils

Abu-Ali,

El-Garhy,

Boraey

et al. 2024

Advances in Civil Engineering

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A stiffened raft is considered one of the efficient foundation systems for lightweight structures resting on expansive soils. Most existing design methods of stiffened rafts require an analysis of the interaction between the raft and the distorted mound shape of the expansive soil. In most design methods, the distorted mound shape is represented in 2D by the edge distance and the maximum differential movement through a nonlinear equation. This study presents a rational method for estimating the climate-controlled soil parameters that are used for estimating the 3D distorted mound shape of the expansive soil from the routine geotechnical tests’ results. These parameters include the equilibrium soil suction, the amplitude of surface suction change, the diffusion coefficient of the soil, the suction compression index, and the active zone depth. The proposed method is explained through its application to calculate the climate-controlled parameters for expansive soils in different locations throughout Saudi Arabia. A parametric study is carried out using a suction diffusion and soil movements program called SUCH to investigate the effect of the climate-controlled soil parameters and raft dimensions on the shape of the distorted mound, maximum differential movement, and edge moisture variation distance. The results of the parametric study are used in a regression analysis to develop an equation for estimating the edge moisture variation distance, which is considered a major barrier to using existing design methods of stiffened rafts as a function of the climate-controlled soil parameters and the aspect ratio of the raft. The findings indicate that the aspect ratio of the raft and the climate-controlled soil parameters have a significant effect on the shape of the distorted mound, its maximum differential movement, and its edge moisture variation distance. Additionally, the proposed equation of the edge moisture variation distance predicts comparable values to that estimated by the program SUCH.

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Section: Computer Program Suchmentioning

confidence: 99%

Section: Computer Program Suchmentioning

confidence: 99%

Estimating the Climate-Controlled Soil Parameters and the Distorted Mound Shape for Analysis of Stiffened Rafts on Expansive Soils

Abu-Ali,

El-Garhy,

Boraey

et al. 2024

Advances in Civil Engineering

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“…The paper of Totoev and Kleeman 41 suggested a model for fluid infiltration to estimate soil suction distribution. A number of studies proposed three‐dimensional decoupled soil–structure interaction (SSI) models to calculate for the volume changes caused by changes in soil matric suction 42–45 . Few design methods were proposed for raft footings based on finite element numerical simulations 22,46 .…”

Section: Introductionmentioning

confidence: 99%

“…A number of studies proposed threedimensional decoupled soil-structure interaction (SSI) models to calculate for the volume changes caused by changes in soil matric suction. [42][43][44][45] Few design methods were proposed for raft footings based on finite element numerical simulations. 22,46 Coupled hydro-mechanical models were developed as well, where historic weather and vegetation data are required as inputs for the calculation of soil mound movements and substructure deflections.…”

Section: Introductionmentioning

confidence: 99%

Design of prefabricated footing connection using a coupled hydro‐mechanical finite element model

Teodosio

Baduge

Mendis

2021

Structural Concrete

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The use of prefabricated systems can alleviate the inadequate housing and skilled workers in most developed countries by expediting required construction time, reducing material wastage, decreasing the effect of weather impacts, minimizing unexpected costs, skilled labor dependence, and construction hazards. The full potential of prefabricated construction is yet to be realized in part due to most advancements being focused on its superstructure. The development of prefabricated substructures for lightweight buildings needs to consider the susceptibility to damage induced by the shrink‐swell movement of expansive soils causing significant global financial losses. Prefabricated substructures should have robust connections in discontinued regions to transfer forces and moments. Due to these issues, the aim of this study is to develop a connection for prefabricated raft substructures of single‐detached dwellings on expansive soils using a combined soil‐structure contact analysis and strut‐and‐tie model approach. The developed substructure system was validated using experiments and further investigated through numerical simulations. The developed prefabricated connection was observed to have satisfactory performance, potentially overcoming most construction limitations of conventional monolithic cast‐in‐place raft substructures, such as faster, safer, and more sustainable construction, while providing comparable strength and serviceability.

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“…Li [17] adopted a coupled thermo-mechanical analogy and introduced this approach as an acceptable and relatively accurate methodology for simulating the moisture diffusion and soil shrink-swell movement in reactive soils. El-Garhy and Wray [18] and Wray et al [19] used an uncoupled approach to model the suction distribution and the corresponding volume change and surface movement of expansive soils using the finite difference technique. Fredlund et al [20] carried out a finite element analysis in an iterative, uncoupled procedure (that is difficult to utilise for routine design) to evaluate the separation distance under the footing edge in the case of the edge drop scenario.…”

Section: Introductionmentioning

confidence: 99%

Simulating the behaviour of reactive soils and slab foundations using hydro-mechanical finite element modelling incorporating soil suction and moisture changes

Shams

Shahin

Ismail

2018

Computers and Geotechnics

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The main objective of this paper is to enhance the current design practice of stiffened slab foundations on reactive soils through an advanced numerical modelling study. The paper presents sophisticated three-dimensional (3D) hydro-mechanical finite element (FE) numerical models using coupled flow-deformation and stress analyses capable of simulating the complex behaviour of reactive soils and slab foundations. The decisive parameters of the developed FE models are described in detail and the modelling efficacy is verified through three case studies. The ability of the FE models to simulate the moisture diffusion and suction variations in relation to climate changes is validated through two case studies involving field observations. A third case study involving a hypothetical stiffened slab foundation on reactive soil is used for comparison with one of the traditional design methods. The developed FE models are found to perform well and overcome some of the most significant limitations of available traditional methods, leading to more reliable design outputs.

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Method for Calculating the Edge Moisture Variation Distance

Cited by 16 publications

References 4 publications

Estimating the Climate-Controlled Soil Parameters and the Distorted Mound Shape for Analysis of Stiffened Rafts on Expansive Soils

Estimating the Climate-Controlled Soil Parameters and the Distorted Mound Shape for Analysis of Stiffened Rafts on Expansive Soils

Design of prefabricated footing connection using a coupled hydro‐mechanical finite element model

Simulating the behaviour of reactive soils and slab foundations using hydro-mechanical finite element modelling incorporating soil suction and moisture changes

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