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Journal ArticleDOI: 10.1080/17486025.2014.985336

Swelling behaviour of GPA-reinforced expansive clay beds subjected to swell-shrink cycles

15 Jan 2015-Geomechanics and Geoengineering (Taylor & Francis)-Vol. 10, Iss: 4, pp 261-270
Abstract: Granular pile-anchor (GPA) technique has been found to be an innovative foundation technique for expansive clays posing the dual problem of swelling and shrinkage. Swelling occurs during absorption of water and shrinkage during evaporation of water. Generally, in field expansive clay beds, swelling takes place during rainy seasons and shrinkage during summers. GPA is a recent innovative foundation technique devised to ameliorate the dual swell-shrink problem of structures founded on expansive clay beds. The other innovative techniques are drilled piers, belled piers and under-reamed piles. Laboratory scale model studies and field scale experiments on GPAs yielded useful results and revealed that swelling of expansive clay beds was effectively controlled by GPA technique. Studies on swell-shrink behaviour of GPA-reinforced clay beds have not been performed so far. This paper presents results obtained from laboratory scale model studies on GPA-reinforced expansive clay beds subjected to alternate cycles of ... more

Topics: Expansive clay (69%), Shrinkage (51%)

Journal ArticleDOI: 10.1097/00010694-197803000-00015
01 Mar 1978-Soil Science
Topics: Expansive clay (61%)

149 Citations

Journal ArticleDOI: 10.1016/J.JNGSE.2015.10.004
Qiao Lyu1, Pathegama Gamage Ranjith2, Xinping Long1, Yong Kang1  +1 moreInstitutions (2)
Abstract: Due to the improvement of drilling and recovery techniques, shale gas exploration has developed rapidly over the past ten years, and problems that have arisen have attracted increasing attention. Swelling of shale with the adsorption of water is one of the leading problems for shale gas exploration, as it causes wellbore instability and shale formation collapse. The main objective of this study is to investigate the relationship of factors that influence shale swelling. On the basis of previous studies, three factors – initial water content, clay fraction and confined pressure – were selected for analysis. In order to further understand the speed of shale swelling, investigations of specimens with different initial water/moisture contents swelling in water/humid conditions are summarized. The results show that water adsorption creates higher swelling volume than moisture adsorption and the maximum swelling speed occurs at an initial water content of about 14%. To measure swelling potential, a multiple linear regression model is developed to obtain an equation to predict shale's swelling potential. According to the regression results, shale swelling is negatively linearly related to initial water content and logarithmic confined pressure, and is correlated linearly with clay fraction. more

Topics: Oil shale (59%), Swelling (54%), Water content (50%)

97 Citations

Journal ArticleDOI: 10.1080/19386362.2017.1398370
Abstract: Several foundation techniques, such as belled piers, under-reamed piles, helical piles are adopted in expansive soils to avoid the problem posed by its swelling nature. In recent years, the granula... more

Topics: Foundation (engineering) (56%), Expansive clay (54%), Pile (53%)

13 Citations

Journal ArticleDOI: 10.1080/19386362.2016.1254991
Abstract: Granular pile anchor (GPA) system is a simple and cost-effective foundation technique for resisting the uplift of foundation caused by swelling of expansive clay. This paper presents the heave resu... more

Topics: Expansive clay (64%), Foundation (engineering) (53%), Pile (52%)

9 Citations


Open accessBook
20 May 2004-
Abstract: DESCRIPTION Unsaturated Soil Mechanics is the first book to provide a comprehensive introduction to the fundamental principles of unsaturated soil mechanics. * Offers extensive sample problems with an accompanying solutions manual. * Brings together the rapid advances in research in unsaturated soil mechanics in one focused volume. * Covers advances in effective stress and suction and hydraulic conductivity measurement. more

Topics: Soil mechanics (67%)

936 Citations

Journal ArticleDOI: 10.1680/GEOT.2003.53.1.41
01 Feb 2003-Geotechnique
Abstract: Consideration of the different roles of pore air pressure, pore water pressure within bulk water and pore water pressure within meniscus water suggests that the degree of saturation will have a significant influence on the stress–strain behaviour of an unsaturated soil, in addition to any influence of suction. This suggestion is supported by experimental evidence. In the light of this, a new elasto-plastic framework for unsaturated soils is proposed, involving coupling of hydraulic hysteresis and mechanical behaviour. Within the proposed framework, plastic changes of degree of saturation influence the stress–strain behaviour, and plastic volumetric strains influence the water retention behaviour. A specific constitutive model for isotropic stress states is proposed, and model predictions are compared with experimental results, in order to demonstrate some of the capabilities of the new framework. Forms of behaviour that can be represented include proper transitions between saturated and unsaturated types ... more

Topics: Pore water pressure (59%), Degree of saturation (53%), Stress–strain curve (53%) more

649 Citations

Open accessBook
01 Jul 1992-
Abstract: Expansive soils: problems and practice in foundation and pavement engineering , Expansive soils: problems and practice in foundation and pavement engineering , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی more

Topics: Foundation (engineering) (62%), Pavement engineering (61%), Expansive clay (56%) more

645 Citations

Journal ArticleDOI: 10.1061/(ASCE)0733-9410(1988)114:2(150)
Abstract: Expansive reactions between lime and sulfate-bearing clay soils have attracted little attention until relatively recently. Lime treatment of Stewart Avenue in Las Vegas, Nevada, had induced heave in excess of 12 in. Heaved areas are found to contain abundant thaumasite, a complex calcium-silicate-hydroxide-sulfate-carbonate-hyd rate mineral. Thaumasite forms a solid solution series with ettringite, a calcium-aluminum-hydroxide-sulfate-hy drate mineral. In the presence of aluminum, ettringite forms first and is replaced by thaumasite only at temperatures below 15°C. The mechanism of heave is a complex function of available water, the percentage of soil clay, and ion mobility. Only the long-term possolanic chemistry of normal lime-soil reactions is disrupted. Cation exchange, agglomeration, and carbonation are unaffected. With the present state of knowledge, lime-induced heave is difficult to predict for all but most obvious conditions. more

Topics: Ettringite (57%), Thaumasite (57%), Lime (56%) more

335 Citations

Journal ArticleDOI: 10.1061/(ASCE)1090-0241(2004)130:7(764)
B. R. Phani Kumar1, Radhey S. Sharma2Institutions (2)
Abstract: This note presents a study of the efficacy of fly ash as an additive in improving the engineering characteristics of expansive soils. An experimental program has evaluated the effect of the fly ash content on the free swell index, swell potential, swelling pressure, plasticity, compaction, strength, and hydraulic conductivity characteristics of expansive soil. The plasticity, hydraulic conductivity and swelling properties of the blends decreased and the dry unit weight and strength increased with an increase in fly ash content. The resistance to penetration of the blends increased significantly with an increase in fly ash content for a given water content. Excellent correlation was obtained between the measured and predicted undrained shear strengths. more

Topics: Fly ash (63%), Expansive clay (55%), Soil mechanics (52%)

307 Citations

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