ASTM D3080/D3080M-23 PDF
Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 1 ноября 2023 г.
- Издание:
- D3080/D3080M
- Технический комитет:
- D18 - Soil and Rock
SIGNIFICANCE AND USE 5.1 The direct shear test is suited to the relatively rapid determination of the drained friction angle of soils under consolidated drained conditions because the drainage paths through the test specimen are short, allowing excess pore pressure to dissipate more rapidly than other drained strength tests. It is applicable for testing intact, or reconstituted specimens. There is, however, a limitation on the maximum particle size (see 6.2.1 and 6.2.2). 5.2 The testing protocols represent a field situation where complete consolidation has occurred under the existing normal stresses. Failure is reached slowly under drained conditions to allow excess pore pressure dissipation during shear. The shear rate must meet the requirements of 9.10. The results from several tests may be used to express the relationship between normal stress on the failure plane and drained shear strength. Note 1: The equipment specified in this standard method is not appropriate for performing undrained shear tests. Using a fast displacement rate without proper control of the volume of the specimen will result in partial drainage and incorrect measurements of shear parameters. 5.3 During the direct shear test, there is rotation of principal stresses and failure may not occur on the weakest plane since failure is forced to occur on or near a plane through the middle of the specimen. The fixed location of the plane in the test can be an advantage in determining the shear resistance along recognizable weak planes within the soil material and for testing interfaces between dissimilar materials. 5.4 There are some limitations of the test, such as nonuniformity of shear stress on the failure plane and possibilities of nonuniformity of the failure plane due to nonuniformities within the soil and applied forces (moments caused by top half of shear box movement either up or down during shearing, and the like). Furthermore, when testing intact stiff clays, which are highly overconsolidated, there... SCOPE 1.1 This test method covers the determination of the consolidated drained shear strength of one specimen of a soil material under direct shear boundary conditions. The specimen is deformed at a controlled rate on or near a single shear plane determined by the configuration of the apparatus. 1.2 Shear stresses and displacements are nonuniformly distributed within the specimen. An appropriate height of the failure zone cannot be defined for calculation of shear strains. Therefore, stress-strain relationships or any associated quantity such as the shear modulus, cannot be determined from this test. 1.3 The results of the test are affected by the presence of coarse-grained soil or rock particles, or both, which may make the testing data invalid in some cases. Check requirements of maximum soil particle size in 6.2.1 and 6.2.2. 1.4 Test conditions, including normal stress, access to water during consolidation and shearing, and specimens conditions should be selected to represent the field conditions being investigated and are left to the engineer or office requesting the test. The rate of shearing must be slow enough to ensure drained conditions. 1.5 Generally, three or more tests are performed on specimens from one soil sample, each under a different normal load, to determine the effects upon shear resistance and displacement. The development of criteria to interpret and evaluate test results is left to the engineer or office requesting the test. Interpretation of multiple tests requires engineering judgment and is beyond the scope of this test method. This test method pertains to the requirements for a single test. 1.6 This test method limits the maximum particle size of the test specimen based on the size of the shear box. Likewise, the gap size during shear is specified. It is acceptable for the testing requester to require a certain gap size between the upper and lower shear box halves to accommodate certa...
Abstract
Overview
ASTM D3080/D3080M-23, titled Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions, is an internationally recognized ASTM standard that outlines procedures for determining the consolidated drained shear strength of soils using the direct shear test. This method is invaluable for assessing soil behavior under conditions where effective drainage allows pore pressures to dissipate, simulating field situations after full consolidation under existing stress conditions.
This standard provides guidelines relevant to both intact and reconstituted soil specimens and is applicable in geotechnical engineering for quick and reliable assessment of the friction angle and shear strength parameters, critical for engineering design, slope stability, and foundation analysis.
Key Topics
- Direct Shear Boundary Conditions: The direct shear test subjects the soil specimen to a controlled shearing along a single predetermined plane, usually at the specimen's mid-height, to estimate drained shear strength.
- Consolidated Drained Conditions: Tests are conducted slowly enough to ensure excess pore water pressure dissipates, providing "drained" strength rather than undrained shear strength.
- Normal Load Variation: For meaningful results, three or more tests are typically performed at different normal loads to observe the relationship between applied normal stress and resulting shear strength.
- Specimen Requirements: The standard limits the maximum particle size of the test specimen based on the shear box dimensions, and test conditions should closely replicate field moisture, density, and stress environments.
- Limitations: The test does not provide stress-strain relationships or shear modulus, as stresses and displacements within the specimen are nonuniform. The method may not be suitable for soils containing large coarse particles or highly overconsolidated stiff clays.
- Safety Precautions: Users must follow safety, health, and environmental practices, as the standard doesn't address all hazards.
Applications
- Geotechnical Site Investigations: Rapid determination of friction angle and drained shear strength is crucial for evaluating slope stability, retaining wall design, and bearing capacity of foundations.
- Soil Structure Interaction: The test is ideal for understanding shear resistance along specific planes, including interfaces between different soil layers or dissimilar materials, such as geomembrane-soil contacts.
- Engineering Design: Provides essential parameters for designing earthworks, embankments, and pavements by quantifying the drained strength under realistic loading and drainage conditions.
- Comparative Studies: Useful for comparing intact vs reconstituted soil behaviors or for material characterization where other more complex or slower tests are impractical.
Related Standards
Several ASTM standards complement or reference ASTM D3080/D3080M-23 for comprehensive geotechnical analysis:
- ASTM D653 – Terminology Relating to Soil, Rock, and Contained Fluids
- ASTM D698 – Standard Proctor Test for Laboratory Soil Compaction
- ASTM D1557 – Modified Proctor Compaction Test
- ASTM D1587/D1587M – Thin-Walled Tube Sampling of Fine-Grained Soils
- ASTM D2216 – Water Content of Soil and Rock by Mass
- ASTM D2435/D2435M – One-Dimensional Consolidation Properties of Soils
- ASTM D2487 – Unified Soil Classification System
- ASTM D4318 – Atterberg Limits
- ASTM D6026 – Significant Digits and Data Records in Geotechnical Data
Practical Value
ASTM D3080/D3080M-23 is trusted for its clear procedures in evaluating consolidated drained shear strength. It is essential for soil testing laboratories, civil engineers, and construction managers who require reliable soil shear parameters to ensure safe and economical engineering solutions. By simulating real field drainage conditions and consolidation, this standard directly supports sustainable infrastructure development and risk mitigation in geo-structural projects.
Keywords: ASTM D3080, direct shear test, consolidated drained conditions, soil shear strength, geotechnical engineering, friction angle, ASTM soil testing, consolidated soil, standard test method, drained strength, shear box test
Технические детали
- SKU
- ASTM D3080/D3080M-23
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