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Characterization of Dispersive Soils

Materials Sciences and Applications 2011年第6期2卷 629-633页

作者： T. S. Umesh S. v. Dinesh puvvadi.v. sivapullaiah 不详

Dispersive soils which occur in many parts of the world are easily erodible and segregate in water pose serious problems of stability of earth and earth retaining structures. The mechanism of dispersivity of soils is reasonably well understood. However there is simple method to identify the dispersivity of the soils and even more difficult to quantify the dispersivity. visual classification, Atterberg’s limits and particle size analysis do not provide sufficient basis to differentiate between dispersive clays and ordinary erosion resistant clays. Pinhole test and double hydrometer test are the only two tests that are in vogue to identify the dispersive soils. This paper explores the possibility of using other standard tests such as shrinkage limit and unconfined compressive strength tests to quantify the dispersivity of the soils. The rationale of using the methods and correlation between the dispersivity determined by various methods has been explained. It has been concluded that dispersivity ascertained from strength tests is more reliable.

关键词： Atterberg’s Limit Dispersive Soils Particle Size Distribution Unconfined Compression Strength

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Cyclic Swell-Shrink Behaviour of CNS-Cushioned Expansive Soils

Cyclic Swell-Shrink Behaviour of CNS-Cushioned Expansive Soi...

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第10届亚洲地区土壤力学与基础工程会议

作者： Rao,K.S.Subba sivapullaiah,P.v. Gurumurthy,J.v. Indian Institute of Science Bangalore India Indian Institute of Science Bangalore India Indian Institute of Science Bangalore India

＜正＞The cyclic swell-shrink behaviour of cushioned expansive black cotton soil has been *** different cohesive non-swelling （CNS） soils were used as cushion *** results indicate that cushioning the expansive soil ...

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Impact of Sulphate Counter Ion in the Migration of Sodium Ion through Soils

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Materials Sciences and Applications 2010年第2期1卷 46-52页

作者： P. v. sivapullaiah Maya Nayak P. Hari Prasad Reddy J. Sumalatha 不详

Laboratory advection-diffusion tests are performed on two regional soils-Brown Earth and Red Earth-in order to assess their capacity to control contaminant migration with synthetic contaminant solution of sodium sulphate with sodium concentration of 1000 mg/L. The test was designed to study the transport/attenuation behaviour of sodium in the presence of sulphate. Effective diffusion coefficient (De) that takes into consideration of attenuation processes is used. Cation exchange capacity is an important factor for the attenuation of cationic species. Monovalent sodium ion cannot usually replace other cations and the retention of sodium ion is very less. This is particularly true when chloride is anion is solution. However, sulphate is likely to play a role in the attenuation of sodium. Cation exchange capacity and type of exchangeable ions of soils are likely to play an important role. The effect of sulphate ions on the effective diffusion coefficient of sodium, in two different types of soils, of different cation exchange capacity has been studied. The effective diffusion coefficients of sodium ion for both the soils were calculated using Ogata Bank’s equation. It was shown that effective diffusion coefficient of sodium in the presence of sulphate is lower for Brown Earth than for Red Earth due to exchange of sodium with calcium ions from the exchangeable complex of clay. The soil with the higher cation exchange retained more sodium. Consequently, the breakthrough times and the number of pore volumes of sodium ion increase with the cation exchange capacity of soil.

关键词： Cation Exchange Capacity Clays Effective Diffusion Coefficient Hydraulic Conductivity Porous Media Sodium Sulphate

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