Experimental Study on Shrinkage Behaviour and Prediction of Shrinkage Magnitudes of Residual Soils

Dhawan, Sarita; Mishra, Anil Kumar; Rao, Sudhakar M.

doi:10.1007/3-540-69873-6_27

Cited by 3 publications

(2 citation statements)

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“…Similar results with four distinct shrinkage zones for compacted samples were presented in Dhawan et al [277]. However, the shrinkage curves in Dhawan et al [277] were not parametrised by an equation, and the shrinkage zones were approached by the geometrisation of straight lines. For sample C8, only three shrinkage zones (proportional, residual, and zero) were detected.…”

Section: Shrinkage Behaviour Of Compacted Soilsupporting

confidence: 76%

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

Schwing¹

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Soil characterisation is of primary interest for several disciplines, including geotechnical and geo-environmental engineering, soil science, and agriculture. An upcoming and promising method for soil characterisation relies on the high-frequency electromagnetic measurement technique which provides the potential to explore and investigate soils. However, successful application of this technique requires a profound understanding of the multi-physical processes arising from interactions between soil as a porous medium and the propagation of electromagnetic waves. This thesis focuses on a coupled experimental investigation of the mechanical, hydraulic, and dielectric characterisation of fine-grained soil during densification.In the framework of this thesis, the following steps have been completed and novel findings have been made:1. Probe designs have been developed, modified and improved to measure the dielectric soil properties in a frequency range from 1 MHz to 3 GHz during shrinkage and compaction. A low-cost in-house-manufactured probe was introduced, which was specifically designed for standardised geotechnical soil shrinkage test. During preliminary investigations, the calibration procedure and performance of these sensors were experimentally and numerically tested. The results showed agreement in the targeted frequency window.2. Compaction and shrinkage tests on fine-grained soils were conducted in combination with dielectric and soil suction measurements. The shrinkage curve and soil water characteristic curve (SWCC) was established and successfully parameterised with physical based models. The complex permittivity was determined in a frequency range from 1 MHz to 3 GHz. The dielectric properties measured during the shrinkage test showed a sudden drop of complex permittivity which could be located in the residual shrinkage zone.3. A theoretical electromagnetic mixture approach was used to model the measured frequency dependent dielectric properties of soils during shrinkage and compaction based on the parameterised shrinkage curve and SWCC. The theoretical results were compared to the dielectric measurements on different fine-grained soils. The comparison ii showed that the real part of permittivity could be well predicted whereas the imaginary part suffered inaccuracies.4. A sensitivity analysis was performed with the theoretical electromagnetic mixture approach in consideration of the shrinkage behaviour and SWCC in order to investigate the influence of soil suction and dry density on the frequency dependent permittivity.The sensitivity analysis showed that the real part of the permittivity near 1 GHz was insensitive to changes in the soil suction and dry density. In the MHz range, the real part of the permittivity was more sensitive to changes in soil suction than it was to dry density. The imaginary part of the permittivity was generally observed to be more sensitive to soil suction over the entire frequency range.

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Section: Shrinkage Behaviour Of Compacted Soilsupporting

confidence: 76%

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

Schwing¹

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“…A decrease in void ratio values is noticed in the case of specimens collected after 21 days of stowing. This may be due to decrease in water content of the specimens by evaporation because of drying and represented as shrinkage (Dhawan et al 2007) or decrease in compressibility of the specimens. The gentle slope of the compression curves indicates no significant change in void ratio with the increment of consolidation pressure and decrease in compressibility due to denser packing of the pond ash particles.…”

Section: Void Ratiomentioning

confidence: 98%

One-Dimensional Consolidation of Sedimented Stowed Pond Ash

Mishra

Das

2011

Geotech Geol Eng

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Use of fly ash locked in the ash ponds in geotechnical applications such as stowing or backfilling of the mines is an attractive alternative to solve the disposal problem. Before it is used as a stowing or backfilling material, the response of the fly ash to imposed load must be determined in order to assess its load taking ability. The present study examines the effect of time and incremental load on the consolidation characteristics of the sedimented stowed pond ash using a fixed ring consolidometer. The important parameters, viz. rate of settlement, consolidation coefficients and void ratio, etc. of the hydraulically stowed pond ash collected after 7, 14, 21, 28 and 35 days of stowing under step incremental loads are determined. The study revealed that 60.42-84.87% settlement of the sedimented stowed pond ash takes place in the initial 1 min of the loading. In addition, it is observed that the coefficient of consolidation of the sedimented stowed pond ash, which varies in the range of 0.0195-0.1882 cm 2 /min, is comparatively low and decreases with the increment of applied load and time.This indicates that the structures lying above the stowed pond ash mass will undergo gradual settling and not suffer large deformation.

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One-Dimensional Consolidation of Sedimented Stowed Pond Ash and Pond Ash-Lime Mixture Deposits—A Comparative Study

Mishra

Das

2014

Particulate Science and Technology

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Experimental Study on Shrinkage Behaviour and Prediction of Shrinkage Magnitudes of Residual Soils

Cited by 3 publications

References 1 publication

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

One-Dimensional Consolidation of Sedimented Stowed Pond Ash

One-Dimensional Consolidation of Sedimented Stowed Pond Ash and Pond Ash-Lime Mixture Deposits—A Comparative Study

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