What is Oedometer modulus?

What is Oedometer modulus?

Nevertheless, oedometer tests are useful for determining the constrained modulus, also known as oedometer modulus (D), which is simply the reciprocal of the coefficient of volume compressibility (mv) commonly used in consolidation.

What does an oedometer test measure?

An oedometer test is a kind of geotechnical investigation performed in geotechnical engineering that measures a soil’s consolidation properties. The applied vertical stress is varied and the change of the thickness of the sample is measured.

What is the consolidation test?

Consolidation test is used to determine the rate and magnitude of soil consolidation when the soil is restrained laterally and loaded axially. The Consolidation test is also referred to as Standard Oedometer test or One-dimensional compression test.

What is elastic modulus of rock?

The elastic modulus describes the linear elastic deformation response of rock under deformation. The static elastic modulus of an intact rock, Ei, is typically calculated as the slope of the stress–strain curve of a rock deforming under uniaxial compression (Ulusay and Hudson 2007).

What is Young’s modulus of concrete?

The elastic modulus of hardened cement paste is around 10 to 30 GPa and that of aggregate is between 45 to 85 GPa. Concrete generally have an elastic modulus varying between 30 to 50 GPa.

What soil properties are found using the oedometer test?

The following soil properties are derived from the Oedometer Test: The Pre-consolidation Pressure: The maximum effective stress that the soil specimen has sustained in its geological history. The Compression Index CC: CC is an index associated with the compressibility of the soil.

Why are direct shear box tests performed?

Direct shear test is simple and faster to operate. As thinner specimens are used in shear box, they facilitate drainage of pore water from a saturated sample in less time. This test is also useful to study friction between two materials one material in lower half of box and another material in the upper half of box.

Why is consolidation test important?

Consolidation Test is used to determine the rate and magnitude of settlement in soils. The settlement values obtained by this test are due to primary consolidation only which is 90% of the total consolidation. The results of consolidation test are very much helpful in the design of foundations.

What kind of test is the oedometer test?

The standard oedometer test, also referred to as consolidation test or one-dimensional compression test, is a classical laboratory test that allows characterizing the soil stress-strain behavior during one-dimensional compression or swelling.

How is the oedometer test used in soil consolidation?

The Oedometer Test aims at measuring the vertical displacement of a cylindrical, saturated soil sample subjected to a vertical load while it is radially constrained. In the subsequent test, the incremental loading consolidation test is described. Note that there is also a constant rate of strain (CRS) test, that nowadays is becoming more popular

What are the ISO standards for oedometer testing?

There are also two ISO standards on oedometer testing: ISO 17892-5:2017 on incremental loading oedometer tests; and BS EN ISO 17892-11:2019 covers various methods of soil permeability testing, including oedometer tests on saturated samples.

How are rigid confining rings used in the oedometer test?

Oedometer tests are designed to simulate the one-dimensional deformation and drainage conditions that soils experience in the field. To simulate these conditions, rigid confining rings are used to prevent lateral displacement of the soil sample.