Prediction of swelling pressures of expansive soils using soft computing methods

İkizler, Sabriye Banu; Vekli, Mustafa; Doğan, Emrah; Aytekin, Mustafa; Kocabaş, Fikret

doi:10.1007/s00521-012-1254-1

Cited by 28 publications

(10 citation statements)

References 24 publications

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“…Both laboratory and in situ techniques are available for the determination of the LSP. Several investigators have proposed experimental methods to determine the lateral LSP introducing modifications to the traditional odometer and hydraulic triaxial apparatus [11][12][13][14]. Largescale tests and in situ investigations were also undertaken to determine the LEP considering influence of the LSP and understand its influence on the infrastructures [15,16].…”

Section: Introductionmentioning

confidence: 99%

A Framework for Interpreting Lateral Swelling Pressure in Unsaturated Expansive Soils

Wei

Liu

et al. 2021

Advances in Civil Engineering

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Lateral swelling pressure (LSP) develops when expansive soil volume increment associated with water infiltration is restrained in a confined domain, for example, due to construction of civil infrastructure. In this paper, initially a flowchart is developed to highlight various key factors that influence the LSP mobilization according to lab and field studies collected from previous literature studies. Then extending unsaturated soil mechanics, a theoretical framework is proposed for illustrating the LSP mobilization in the field against retaining structures and pile foundations under different boundary conditions, respectively. An example problem for a basement wall and a pile foundation constructed in a typical expansive soil from Regina, Canada, is presented to illustrate the proposed theoretical framework. The framework and corresponding analysis presented in this paper can facilitate to provide rational designs of geotechnical infrastructures in expansive soils.

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Section: Introductionmentioning

confidence: 99%

A Framework for Interpreting Lateral Swelling Pressure in Unsaturated Expansive Soils

Wei

Liu

et al. 2021

Advances in Civil Engineering

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“…Expansive soil is a kind of high-plasticity clay with strong hydrophilic mineral components, such as montmorillonite and illite. It presents the swelling property when absorbing water and shrinking property when losing water [1,2]. Due to the unstable behavior of expansive soil, it is easy to cause a series of engineering disasters, inclusive of differential settlement of subgrade, incline and subsidence of buildings, and collapse of slope occurrence.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Microstructure and Physical‐Mechanical Properties of Expansive Soil Stabilized with Fly Ash, Sand, and Basalt Fiber

Cao

Yuan

2018

Advances in Materials Science and Engineering

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Expansive soil is a source of risk to the foundations or subgrade engineering. Stabilization of expansive soil is imperative for practical engineering. A series of laboratory experiments were performed to analyze the physical-mechanical properties and microstructures of stabilized soil. Three stabilizers used in this study are fly ash, sand, and basalt fiber. Different percentages of fly ash (0, 5, 10, 15, and 20%), sand (0, 8, 16, and 24%), and basalt fiber (0 and 0.4%) were added by weight into natural soil. Experimental results indicate that the optimum moisture content of stabilized soil increases with the increase of fly ash content for a given sand content, whereas the maximum dry density shows a decreasing trend. The variation trend of optimum moisture content and maximum dry density turns reverse with the increase of sand content for a given fly ash content. Plasticity index is decreased by both increasing fly ash content and sand content. It is found that the maximum unconfined compressive strength and optimum growth rate of strength are obtained by selected mixtures of 10% fly ash, 8% sand, and 0.4% basalt fiber contents. As the analysis of complementary effect suggests, most of the mixt treatments applied in this study have produced good results associated with the strength enhancement of expansive soil. In line with the results of SEM tests, the connection among clay particles has been enhanced through the generation of hydration products (C-S-H and AFt) of fly ash. The filling effect of sand has increased the integrality and compactness of stabilized soil. Moreover, the gripping effect between fibers and soil particles notably improves the strength of stabilized soil. The effect of sand on reinforced soil with 0.4% basalt fiber increases the interfacial force between fibers and soil particles.

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“…Expansive soil is a kind of high plasticity clay which has obvious swell-shrink characteristics. It also has the engineering properties of shrinking and cracking due to water loss and the swelling and softening due to the moisture content increase [1,2]. Expansive soil problem mainly comes from its water stability.…”

Section: Introductionmentioning

confidence: 99%

“…Popescu [6], Osipov et al [7], and Basma et al [8] studied expansive soil basic properties with full shrinkage method and found that the swelling ability of specimens increases with the number of wetting and drying cycles. Such cyclic swelling and shrinkage potentials of the ground will cause severe damage to the overlying structures such as the pavements and embankment [2,3]. So it is important to improve the hydrophilic, physical, and mechanical properties of expansive soil for slope stability of embankment and highway engineering and reducing the cost of investment [9].…”

Section: Introductionmentioning

confidence: 99%

Research on Wetting-Drying Cycles’ Effect on the Physical and Mechanical Properties of Expansive Soil Improved by OTAC-KCl

Wang

Zhang

Qiu

et al. 2015

Advances in Materials Science and Engineering

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Expansive soil experiences periodic swelling and shrinkage during the alternate wet and dry environments, which will result in severe damage to the slope stability. In this study, a promising modifier OTAC-KCl is introduced, which has a good diffusivity and is soluble in water or other solvents easily. Firstly, a reasonable combination of ameliorant 0.3% STAC and 3% KCl is chosen referring to the free swell test. Then, the best curing period, 14 days, is gotten from UCS tests. The effect of wetting and drying cycles on engineering properties of expansive soil improved by OTAC-KCl admixtures after 14-day curing is also studied accordingly. Both treated and untreated expansive soil samples are prepared for the cyclic wetting-drying tests which mainly include cyclic swelling potential and cyclic strength tests. Experimental results show that the swelling potential of expansive soil samples stabilized with OTAC-KCl is suppressed efficiently, and the untreated soil specimens will collapse when immersed in water while the treated specimens keep in good conditions. Moreover, expansive soil samples modified with 0.3% OTAC + 3% KCl show enough durability on the swelling ability, shear strength, and unconfined compressive strength, which means, that both the physical and the mechanical properties of stabilized expansive soil have been improved effectively.

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Prediction of swelling pressures of expansive soils using soft computing methods

Cited by 28 publications

References 24 publications

A Framework for Interpreting Lateral Swelling Pressure in Unsaturated Expansive Soils

A Framework for Interpreting Lateral Swelling Pressure in Unsaturated Expansive Soils

Experimental Research on Microstructure and Physical‐Mechanical Properties of Expansive Soil Stabilized with Fly Ash, Sand, and Basalt Fiber

Research on Wetting-Drying Cycles’ Effect on the Physical and Mechanical Properties of Expansive Soil Improved by OTAC-KCl

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