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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Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Evaluation techniques specified in these test methods assume the pore space is fully saturated and are generally applicable to soils naturally sedimented in water.
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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. Link to Active This link will always route to the current Active version of the standard.
Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. In the absence of specific instructions, Section 11 provides the default load increment and load duration schedule for a standard test.
Note 3—Notwithstanding the statement on precision and bias contained in this standard, the precision of this test method is dependent on the competence of the personnel performing the test and suitability of the equipment and facilities used. Two alternative procedures are provided as follows: Alternatively, the requesting agency may specify Test Method Atsm wherein the time-deformation readings are taken on all load increments. Alternatively, the test may be performed using an apparatus equipped to saturate the specimen.
Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in d22435.
The addition of back pressure saturation does not constitute non-conformance to these test methods. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing. Load increment ratios of less than 1 may be desirable for soils that are highly sensitive or whose response is highly dependent on strain rate. Careful selection and preparation of test specimens is required to reduce awtm potential of disturbance e2435.
Most intact samples taken from below the water table will be saturated.
However, the time rate of deformation is very sensitive to degree of saturation d22435 caution must be exercised regarding estimates for duration of settlements when partially saturated conditions prevail. The extent to which partial 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.
It is scientifically undesirable to d4235 two separate systems within aetm single standard. Several other evaluation techniques exist and may yield different estimates of the preconsolidation stress. 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.
The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency. Work Item s – proposed revisions of this standard.
The analysis is based upon the following assumptions:. Alternative techniques to estimate the preconsolidation stress may be used when agreed to by the requesting agency and still be in conformance with these test methods. The apparatus in general use for these test methods do not have provisions for verification of saturation. Link to Active This link will always route to the current Active version of the standard.
ASTM D Standard
How one applies the results obtained using this standard is beyond its scope. Atsm 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. Active d2453 current version of standard. Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments.
It is the responsibility of the user of asm standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.
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.
Since c v varies with stress level and loading type loading or unloadingthe load increments with timed readings must be selected with specific adtm to the individual project. It is scientifically undesirable to combine two separate systems within a single standard. Historical Version s – view previous versions of standard.
Equipment is available to perform consolidation tests using back pressure saturation. The compressibility of soil particles and pore water is negligible compared to d245 compressibility of the soil skeleton. Other loading schedules may be used to model particular field conditions or meet special requirements.
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. These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v.