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T Thyagaraj
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T Thyagaraj
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T Thyagaraj
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Thyagaraj, T.
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4 results
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- PublicationEffect of Pore Fluid on Cyclic Behaviour of Reconstituted Marine Clay(01-01-2018)
;Senapati, Swagatika; The effect of pore fluid chemistry on the cyclic behaviour of fine grained soil is studied by performing strain controlled undrained cyclic triaxial tests on reconstituted marine clay with 0.4 M sodium chloride solution and distilled water. Specimens using different pore fluids were prepared by slurry consolidation method at vertical stress of 50 kPa. The influence of physico-chemical factors on the cyclic behaviour of reconstituted marine clay was brought out by studying the effect of number of cycles on the cyclic shear modulus degradation of clay. The effective confining pressure was taken as 150 kPa, loading frequency as 1 Hz, number of loading cycles as 100, and the strain range is kept in between 0.3% to 1%. The experimental results show that, with 0.4 M sodium chloride solution as the pore fluid, the shear modulus increases at lower strain range. The variation of damping ratio with the cyclic shear strain was also brought out in this study. - PublicationSwell-shrink and hydraulic behaviour of compacted red soil-bentonite mixture(20-04-2021)
;Devapriya, A. S.Clay liners are provided in waste landfills to prevent the leachate from percolating into underlying soil and ground water and polluting it. Hence, soils used as landfill liners must possess low hydraulic conductivity (< 10-7 cm/s). In the initial as-compacted state, liners satisfy this design criterion. However, in the field, liners are subjected to alternate wet-dry cycles and the initial microstructure of liners change, thereby affecting their hydraulic properties. The present study was conducted on a locally available red soil mixed with bentonite so that it satisfies the requirement of hydraulic conductivity in the as-compacted state. To achieve this objective, identical specimens compacted at optimum moisture content to its maximum dry density were inundated with distilled water under a surcharge load of 12.5 kPa. Upon attainment of maximum swelling, hydraulic conductivity tests were conducted at swollen state under a hydraulic gradient of 20. The soil specimens were then dried at a temperature of 45 2 C. The weight, height and diameter of specimens were measured continuously during drying to study the shrinkage behaviour of the soil. The dried specimens were subjected to subsequent wet-dry cycles until the specimens reached an equilibrium state and the hydraulic conductivity was determined after each wetting cycle. SEM images were also captured to analyse the changes in the soil structure in the as-compacted state and at the end of different wetting cycles. - PublicationStabilization of Expansive Soil Using Lime Pile and Lime Precipitation Techniques-A Comparative Study(01-01-2020)
;Kumar, K. S.R.This paper presents a comparative study of stabilization of expansive soil using lime pile and lime precipitation technique. Lime precipitation was carried out by sequential permeation of calcium chloride (CaCl2) and sodium hydroxide (NaOH) solutions through a central hole in the compacted expansive clay. Similarly, lime pile was installed in a central hole of compacted expansive soil. After 30 days of curing, the undisturbed soil specimens were collected from different radial distances for evaluation of physico-chemical, index, and engineering properties. Microstructural changes were captured using scanning electron microscopic (SEM) images and electron dispersive X-ray spectroscopy analysis (EDAX) for both treated and untreated soils. The index and engineering properties of treated soils indicate that the lime precipitation treatment was effective up to a radial distance of 2.5 d from the central hole of diameter, d, while the lime pile treatment was limited to a radial distance of less than 0.8 d. - PublicationEffect of Sand Content on Cyclic Swell-Shrink Behavior of Compacted Expansive Soil(01-01-2020)
;Ramesh, SabariAlternate wetting and drying of soils arise as a result of seasonal moisture fluctuations which in turn lead to the volume change in soils. An increase in volume caused by an intake of water is termed as swelling, and a reduction in volume occurring due to loss of water is defined as shrinkage. Shrinkage poses a much more serious problem than the swelling and depends on many factors including the sand content. This paper mainly focuses on understanding the role of sand fraction on the swell-shrink pattern of expansive soil. To achieve this objective, the laboratory swell-shrink tests were conducted on both expansive soil (C100) and expansive soil mixed with 50% sand (C50-S50). Digital camera image analyses were performed for identification of cracks during drying cycles. The experimental results show that the vertical, lateral, and volumetric deformations decreased for C50-S50 specimen during each wet-dry (W-D) cycle with reference to the C100 specimen. This is attributed to the reduction in the amount of clay, swelling of clay particles in the inter-void spaces between clay and sand, and encapsulation offered by the sand particles. For C50-S50 specimen, mostly surface cracks were observed and the volume of cracks formed were much lesser compared to C100 specimen.