Designation: D/DM – 11Standard Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Lo. GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Method for One-Dimensional Consolidation Properties of Soils. Standard Test Method for One-Dimension Consolidation Properties of Soil Using Incremental Loading.
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Time-deformation readings are required on a minimum of two load increments. This test method has been written using SI units; however, inch-pound conversions are given in the gravimetric system, where the pound lbf represents a unit of force asgm.
The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency. Inundation of the test specimen does not significantly change the degree of saturation of the test specimen but rather provides boundary water to eliminate negative pore pressure associated with sampling and prevents evaporation during the test. Since c v varies with stress level and loading type loading or unloadingthe load increments with timed readings must be selected with specific reference to the individual project.
The addition of back pressure saturation does not constitute non-conformance to these test methods. It is the responsibility of aatm user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D Standard
In the absence of specific instructions, Section 11 provides the default load increment and load duration schedule for a standard test. Traditionally, the axial stress is doubled for each increment resulting in a load increment ratio of 1. The apparatus in general use does not have provisions for formal verification of pore pressure dissipation. Accept and continue Learn more about the cookies we use and how to change your settings. Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
This test method provides the compression curve with explicit data to account for secondary compression, the coefficient of consolidation for saturated materials, and the rate of secondary compression. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
Careful selection and preparation of test specimens is required to reduce the potential of disturbance effects.
Asrm, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments. Work Item s – proposed revisions of this standard. The values stated in inch-pound units are approximate and given for guidance only. Users of this test method are cautioned that compliance with Practice D does not assure reliable testing.
It is scientifically undesirable to combine two separate systems within a single standard. Note 1—The determination of the rate and magnitude of consolidation of soil when it is subjected to controlled-strain loading is covered by Test Method D You may find similar items within these categories by selecting from the choices below:.
Consolidation test results are dependent upon the duration of each load increment. Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments. Search all products by. It is scientifically undesirable to combine two separate systems within a single standard.
For example, it may be desirable to inundate and load the specimen in accordance with the wetting or loading pattern expected in the field in order to best evaluate the response. Find Similar Items This product falls into the following categories. Active view current version of standard. Two alternative procedures are provided as follows:.
How one applies the results obtained using this standard is beyond its scope. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete.
This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. Consolidation test results are dependent on the magnitude of the load increments. For intact samples, this loading procedure has provided data from which estimates of the preconsolidation stress, using established interpretation techniques, compare favorably with field observations.
Note 1—The determination of the rate and magnitude of consolidation of soil when it is subjected to controlled-strain loading is covered by Test Method D Combining values from the two systems may result in non-conformance with the standard.
Two alternative procedures are provided as follows:. Several other evaluation techniques exist and may yield different estimates of the preconsolidation stress.