Standard Test Method for One-Dimension Consolidation Properties of Soil Using Incremental Loading. GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Method for One-Dimensional Consolidation Properties of Soils. Buy ASTM D TEST METHODS FOR ONE-DIMENSIONAL CONSOLIDATION PROPERTIES OF SOILS USING INCREMENTAL.
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How one applies the results obtained using this standard is beyond its scope. The test results can be greatly affected by sample disturbance. It is the responsibility of the user of this standard to establish appropriate safety c2435 health practices and determine the applicability of regulatory limitations prior to use. These test methods specify procedures for two techniques Method A and Method Bhowever alternative techniques may be used when agreed to by the requesting agency and still be in conformance with these test methods.
This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system.
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How one applies the results obtained using this standard is beyond its scope. These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v. Two alternative procedures are provided as follows:.
Other loading schedules asmt be used to model particular field conditions or meet special requirements.
Alternative techniques to estimate the preconsolidation stress may asmt used when agreed to by the requesting agency and still be in conformance with these test methods.
Tests performed ashm other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Since c v varies with stress level and d24335 type loading or unloadingthe load increments with timed readings must be selected with specific reference to the individual project. The data from the consolidation test are used to estimate the magnitude and rate of both differential and total settlement of a structure or earthfill. 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 weight.
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 Time-deformation readings are required on a minimum of two load increments. For example, it may be desirable to inundate and aztm the specimen in accordance with the wetting or loading pattern expected in the field in order to best evaluate the response.
Evaluation techniques specified in this test method are generally applicable to soils naturally satm in water. The extent to which ast, saturation influences the test results may be a part of the test evaluation and may include application of theoretical models other than conventional consolidation theory.
The compressibility of soil particles and pore water is negligible compared to the compressibility of the soil skeleton. 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 It is scientifically undesirable to combine two separate systems within a single standard.
Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D Standard
Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation, c v. Two alternative procedures are provided as follows:.
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. Consolidation test x2435 are dependent upon the duration of each load increment. This test method provides only the d24435 curve of the specimen and the results combine both primary consolidation and secondary compression deformations.
The interpretation method specified by these test methods to estimate the preconsolidation stress provides a simple technique to verify that one set of time readings are taken after the preconsolidation stress and that the specimen is loaded to a sufficiently high stress level.
Alternatively, the requesting aetm may specify Test Method B wherein the time-deformation readings are taken on all load increments. Consolidation test results are dependent on the magnitude of the load increments.
Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments.
Combining values from the two systems may result in non-conformance with the standard. Time-deformation readings are required on a minimum of two load increments.
The values astmm in inch-pound units are approximate and given for guidance only. Two alternative procedures are provided as follows: However, the time rate of deformation is very sensitive to degree of saturation and caution must be exercised regarding estimates for duration of settlements when partially saturated conditions prevail.