ASTM D3080  Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions

ASTM D3080  Tiêu chuẩn ASTM về thí nghiệm cắt của đất

 

1. Scope

1.1 This test method covers the determination of the consolidated drained shear strength of a soil material in direct shear.

1.2 Shear stresses and displacements are nonuniformly distributed within the specimen. An appropriate height cannot be defined for calculation of shear strains. Therefore, stress-strain relationships or any associated quantity such as modulus, cannot be determined from this test.

1.3 The determination of strength envelopes and the development of criteria to interpret and evaluate test results are left to the engineer or office requesting the test.

1.4 The results of the test may be affected by the presence of soil or rock particles, or both, (see Section 7).

1.5 Test conditions including normal stress and moisture environment are selected which represent the field conditions being investigated. The rate of shearing should be slow enough to ensure drained conditions.

1.6 There may be instances when the gap between the plates should be increased to accommodate sand sizes greater than the specified gap. Presently there is insufficient information available for specifying gap dimension based on particle size distribution.

1.7 The values stated in inch-pound units are to be regarded as the standard. Within this test method the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of each other.

1.8 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in

Practice D 6026.

1.8.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope.

1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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 D3080 Direct Shear Test of Soils Under Consolidated Drained Conditions
ASTM D3080 Tiêu chuẩn ASTM về thí nghiệm cắt của đất

2. Referenced Documents

2.1 ASTM Standards:

D422 Method for Particle-Size Analysis of Soils2

D653 Terminology Relating to Soil, Rock, and Contained Fluids

D698 Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft)

D1557 Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56 000 ft-lbf/ft)

D1587 Practice for Thin-Walled Geotechnical Tube Sampling of Soils

 

Rock

D4220 Practices for Preserving and Transporting Soil Samples

D4318 Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils

 

3. Terminology

3.1 Definitions—For definitions of terms used in this test method, refer to Terminology D 653.

3.2 Description of Terms Specific to This Standard:

3.2.1 Relative Lateral Displacement—The horizontal displacement of the top and bottom shear box halves.

3.2.2 Failure

ASTM D3080 Direct Shear Test

4. Summary of Test Method

ASTM D3080 Tiêu chuẩn ASTM về thí nghiệm cắt của đất

5. Significance and Use

ASTM D3080 Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
ASTM D3080 Tiêu chuẩn ASTM về thí nghiệm cắt của đất

6. Apparatus

6.1 Shear Device

6.2 Shear Box

6.3 Porous Inserts

6.4 Loading Devices:

6.5 Shear Force Measurement Device

6.6 Shear Box Bowl

6.7 Controlled High Humidity Room

6.8 Trimmer or Cutting Ring

6.9 Balances

6.10 Deformation Indicators

6.11 Apparatus for Determination of Water Content

6.12 Equipment for Remolding or Compacting Specimens,

if applicable.

6.13 Miscellaneous Equipment

 

7. Test Specimen

ASTM D3080 Direct Shear Test

8. Calibration

9. Procedures

 

10. Calculation

11. Report: Test Data Sheet(s)/Form(s)

 

ASTM D3080 Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
ASTM D3080 Tiêu chuẩn ASTM về thí nghiệm cắt của đất

12. Precision and Bias

 

ASTM D3080 Direct Shear Test

13. Keywords

compacted specimens; consolidated; direct-shear test;

drained test conditions; Mohr strength envelope; shear strength; undisturbed

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ASTM D3080 Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
ASTM D3080 Tiêu chuẩn ASTM về thí nghiệm cắt của đất

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