Fundamentally, an oedometer consists of three components: a) a "consolidation cell", to hold the sample; b) a mechanism for applying a known pressure on the sample; c) an instrument to measure changes in the thickness of the sample.[12]​.

The test kit is sometimes called an “oedometer test set.” A typical inventory of an oedometric laboratory includes:[13]​.

The consolidation cell is the part of the oedometer that holds the sample during the test. In the center of the cell is a ring where the sample is placed. Typically, the ring resembles a cookie cutter, with a sharp edge on one side, so that it can cut a sample piece from a block of natural terrain. Two pieces of porous stone tightly fitted to the ring provide water to the sample and mechanically confine it. These components are housed in a cylinder, which contains slots to ensure good alignment of the components and provide water supply and removal to the exterior drain. Using a rigid mass on the sample, compressional loads are applied to the sample.[12]​[14]​.

The oedometer loading mechanism applies a known load. Since the diameter is fixed, a compressional stress is applied to the sample. Most oedometers achieve this with a lever arm and a set of free weights, which provide a known gravitational load, and the lever arm multiplies and transmits the load to the sample.[15]​.

Contenido

Hay muchas pruebas edométricas para determinar las propiedades de consolidación. El tipo más común es el de carga incremental (IL, sigla en inglés).[16]​.

Sample preparation

Tests are carried out on specimens of unaltered samples. A rigid confining ring with a sharp edge cuts a sample directly from a block of terrain. The excess portion is carefully removed, leaving a sample with a diameter-to-height ratio of 3 or greater. Porous stones are placed on top and below the base of the specimen, for drainage. A rigid mass is placed on the top porous stone. For saturated samples it is important to immerse the entire ring in water to prevent the sample from drying out.[16]​.

Incremental load

This assembly is placed on a load-bearing frame. Weights are placed on the frame, to impose a load on the sample. Compression is measured with respect to time using a dial indicator (manometer). The deflection value based on time data can be determined when the sample has reached the end of primary consolidation. Another load is immediately applied, and this process is repeated. After a significant total load has been applied, the load on the sample is gradually decreased. A load increment of 1/2 provides a sufficient amount of data to describe the effective void-stress relationship of a soil.[16]​.

Fundamentally, an oedometer consists of three components: a) a "consolidation cell", to hold the sample; b) a mechanism for applying a known pressure on the sample; c) an instrument to measure changes in the thickness of the sample.[12]​.

The test kit is sometimes called an “oedometer test set.” A typical inventory of an oedometric laboratory includes:[13]​.

The consolidation cell is the part of the oedometer that holds the sample during the test. In the center of the cell is a ring where the sample is placed. Typically, the ring resembles a cookie cutter, with a sharp edge on one side, so that it can cut a sample piece from a block of natural terrain. Two pieces of porous stone tightly fitted to the ring provide water to the sample and mechanically confine it. These components are housed in a cylinder, which contains slots to ensure good alignment of the components and provide water supply and removal to the exterior drain. Using a rigid mass on the sample, compressional loads are applied to the sample.[12]​[14]​.

The oedometer loading mechanism applies a known load. Since the diameter is fixed, a compressional stress is applied to the sample. Most oedometers achieve this with a lever arm and a set of free weights, which provide a known gravitational load, and the lever arm multiplies and transmits the load to the sample.[15]​.

Contenido

Hay muchas pruebas edométricas para determinar las propiedades de consolidación. El tipo más común es el de carga incremental (IL, sigla en inglés).[16]​.

Sample preparation

Tests are carried out on specimens of unaltered samples. A rigid confining ring with a sharp edge cuts a sample directly from a block of terrain. The excess portion is carefully removed, leaving a sample with a diameter-to-height ratio of 3 or greater. Porous stones are placed on top and below the base of the specimen, for drainage. A rigid mass is placed on the top porous stone. For saturated samples it is important to immerse the entire ring in water to prevent the sample from drying out.[16]​.

Incremental load

This assembly is placed on a load-bearing frame. Weights are placed on the frame, to impose a load on the sample. Compression is measured with respect to time using a dial indicator (manometer). The deflection value based on time data can be determined when the sample has reached the end of primary consolidation. Another load is immediately applied, and this process is repeated. After a significant total load has been applied, the load on the sample is gradually decreased. A load increment of 1/2 provides a sufficient amount of data to describe the effective void-stress relationship of a soil.[16]​.