Prediction of swelling characteristics of remoulded and compacted expansive soils using free swell index

Rao, A. Jagannadha; Phanikumar, B. R.; Sharma, Raghav

doi:10.1144/1470-9236/03-052

Cited by 55 publications

(40 citation statements)

References 8 publications

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“…, Delage et al (1998),Tripathy et al (2002),Cui et al (2002) andRao et al (2004). This conclusion is not general and depends on the particular clay mineralogy.…”

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confidence: 89%

Swelling phenomena and effective stress in compacted expansive clays

Maš́ın

Khalili

2016

Can. Geotech. J.

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The central aim of the paper is to discuss the applicability of the effective stress principle as defined by Terzaghi (total stress minus pore water pressure) to predict the behaviour of expansive clay aggregates. Phenomena occurring between individual clay minerals are reviewed first at the molecular level obtained in the colloid science research. In particular, it is noted that, for inter-particle distances higher than approx. 1.5 nm, the pore water pressure in bulk equilibrium solution forms an additive component of the inter-particle disjoining pressure. It is concluded that for these distances the Terzaghi's effective stress principle should be adequate to describe the clay behaviour. To support the developments, an extensive experimental database of nine different sodium and calcium bentonites available in publishhed literature was analysed. With the aid of double structure constitutive modelling, procedures were developed to extract the information on the behaviour of clay aggregates from the experimental measurements. It was then shown that unconfined water retention curves, swelling pressure tests, swelling under constant load tests and mechanical unloading tests are all uniquely related in terms of the dependency of dry density (or void ratio) of clay aggregate vs. mean effective stress. By considering reversibility of aggregate behaviour and full saturation of aggregates, this implies that the effective stress principle is valid in predicting expansive clay aggregate volumetric deformation.

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“…, Delage et al (1998),Tripathy et al (2002),Cui et al (2002) andRao et al (2004). This conclusion is not general and depends on the particular clay mineralogy.…”

mentioning

confidence: 89%

Swelling phenomena and effective stress in compacted expansive clays

Maš́ın

Khalili

2016

Can. Geotech. J.

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“…This value is obtained from the e*log p curve where the pressure corresponds to the initial void ratio. Chen, in 1975, proposed that swelling pressure depends on three categories of characteristics: index properties (such as liquid limit, plasticity index, and free swell index (FSI)), clay content, and placement conditions (including initial dry unit weight and initial water content) (Rao et al, 2004). Chen also proposed that the dry unit weight and swelling pressure have a proportional relationship while the initial water content and swelling pressure have an inverse relationship.…”

Section: Literature Reviewmentioning

confidence: 99%

“…This project will re-examine the data collected by Rao et al (2004). The original model for the data was a function of FSI, initial water content, and initial dry unit weight.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The sample information for the statistical regression models created by this research was obtained from Rao et al's (2004) dataset (see Table 1). Rao et al (2004) prepared 10 remoulded black cotton soil specimens; these samples were collected from 10 districts in the state of Andhra Pradesh, India.…”

Section: Model Developmentmentioning

confidence: 99%

“…In contrast the soil shrinks, or decreases in volume, during dry spells when the water is evaporated from the soil. This seasonal cycle of increasing and decreasing volume causes damage to structures found on expansive soils (Rao et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Statistical regression models for predicting the swelling pressure of compacted expansive soils

James

Unnikrishnan

Sharma

2013

International Journal of Geotechnical Engineering

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This study used 10 different soil samples to calibrate and validate two new linear regression models (M1 and M2) that use initial placement conditions and index properties to predict swelling pressure. These models were created through numerous t-tests that eliminated statistically insignificant independent variables from the final models. The absolute error of each model was calculated between the predicted swelling pressure and the actual swelling pressure values. The absolute errors of these models were then compared with the absolute errors of the models discussed in the literature that use congruent independent variables for predicting the swelling pressure. When strictly comparing the model fit measure (adjusted R 2 ), M2 resulted in the best fit. However, when comparing the absolute prediction error of each model, M1 appeared the most accurate of the 14 models considered. In addition, M1 is the most user friendly of the new models because it is a linear model with easily estimable independent variables for an accurate, consistent estimation of swelling pressure.

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Effect of Unsaturated Expansive Soils on Canal Linings: A Case Study on the Tabriz Plain Canal, Iran

Sarand

Hajialilue-Bonab

2017

Irrigation and Drainage

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Because of the linear nature of water conveyance projects, they include various geological formations and are usually in contact with water. For these reasons, most constructed irrigation and drainage networks are subject to deformation and displacement due to problematic soils. One of these problematic beds is unsaturated expansive soil. Unreinforced trapezoidal canals are damaged when constructed on these types of soils. In the present study, this phenomenon has been studied using field observations and numerical modelling. In practice, a filter layer is used to reduce soil swelling effects on the canal lining in the Tabriz plain project. To investigate the performance of this layer, the amount of soil swelling and relative displacement of the canal section panels are measured by recording of surveying points. This phenomenon is also modelled numerically. Using the results obtained, the swelling of the bed soil is calculated at different parts of the canal section with the filter and without it and the locations of maximum movements are determined. In order to predict the interaction behaviour between unsaturated expansive soil and concrete lining under different moisture conditions, a special constitutive unsaturated soil behaviour model has been selected in the software. The results of analysis show the location of maximum deformation and stress concentration on the canal section. Using these results, the effect of joint locations to reduce the destructive interaction force can be obtained. In addition, comparison between the results of numerical modelling and field data illustrates acceptable accuracy of the numerical modelling. Copyright © 2017 John Wiley & Sons, Ltd.

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Prediction of swelling characteristics of remoulded and compacted expansive soils using free swell index

Cited by 55 publications

References 8 publications

Swelling phenomena and effective stress in compacted expansive clays

Swelling phenomena and effective stress in compacted expansive clays

Statistical regression models for predicting the swelling pressure of compacted expansive soils

Effect of Unsaturated Expansive Soils on Canal Linings: A Case Study on the Tabriz Plain Canal, Iran

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