Compressibility And Consolidation Of Soil Pdf

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Metrics details. The compression index and recompression index are one of the important compressibility parameters to determine the settlement calculation for fine-grained soil layers. These parameters can be determined by carrying out laboratory oedometer test on undisturbed samples; however, the test is quite time-consuming and expensive.

Compressibility And Consolidation Civil Engineering (CE) Notes | EduRev

Formation of varved clays is characterized by specific compressibility and consolidation features, which are difficult to assess. The construction of an expressway through the area of varved, glacilimnic sediments Vistula glacial period required careful analysis of the soil reaction to the increasing load caused by growing embankment. The settlement analyses conducted in relation to the schedule of load increase during construction allowed to verify the deformability assessment of the compressible clays. In order to quantify the compressibility and consolidation parameters of clays, an iterative calculation model was created. The observed delayed reaction of the soil to applied load allowed to assess the nature of consolidation. Comparison of the parameters obtained from the model with the results of laboratory and field tests allowed to evaluate drainage characteristics during consolidation of varved clays as well as to introduce correlation coefficients for interpreting compressibility parameters on the basis of CPT tests. The accurate deformability prognosis of soft soils under various objects such as highways and railways, dikes, housing building etc.

Soil consolidation refers to the mechanical process by which soil changes volume gradually in response to a change in pressure. This happens because soil is a two-phase material, comprising soil grains and pore fluid, usually groundwater. When soil saturated with water is subjected to an increase in pressure, the high volumetric stiffness of water compared to the soil matrix means that the water initially absorbs all the change in pressure without changing volume, creating excess pore water pressure. As water diffuses away from regions of high pressure due to seepage , the soil matrix gradually takes up the pressure change and shrinks in volume. The theoretical framework of consolidation is therefore closely related to the diffusion equation , the concept of effective stress , and hydraulic conductivity. In the narrow sense, "consolidation" refers strictly to this delayed volumetric response to pressure change due to gradual movement of water.

What are the Compressibility and Consolidation of Soil?

Chapter 5 Compressibility And Consolidation. Remember: Consolidation settlement is a function of effective stress and not the function of total stress. For cohesionless soil. Login New User. Sign Up. Forgot Password?

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Soil Mechanics – Third Year Civil Eng. Mechanism of Consolidation Process. For Clays: low permeability ~ valve is partially open, water gets out.


Soil consolidation

The compression index and recompression index are one of the important compressibility parameters to determine the settlement calculation for fine-grained soil layers. These parameters can be determined by carrying out laboratory oedometer test on undisturbed samples; however, the test is quite time-consuming and expensive. Therefore, many empirical formulas based on regression analysis have been presented to estimate the compressibility parameters using soil index properties. In this paper, an artificial neural network ANN model is suggested for prediction of compressibility parameters from basic soil properties.

Soil is a multi-phase medium made up of mineral grains which enclose voids that may be filled with gas, liquid or a combination of both. When stress is applied to a soil sample its volume decreases. Such a change in volume may be due to: a a compression of the solid soil particles, b a compression of water and air within the voids, or c an escape of water and air from the voids. The solid particles and the pore water are relatively incompressible and therefore under the loads usually encountered in geotechnical engineering, they will not undergo appreciable volume changes.

Soil Mechanics pp Cite as. Unable to display preview. Download preview PDF. Skip to main content.

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5 Response
  1. Bruce B.

    - Compressibility: Volume changes in a soil when subjected to pressure –giving. AMOUNT of settlement. - Consolidation: Rate of volume change with time –giving​.

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