Standard Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method

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1.1 This test method covers a procedure for determining the shear resistance of a geosynthetic against soil, or a geosynthetic against another geosynthetic, under a constant rate of deformation.
1.1.1 The test method is intended to indicate the performance of the selected specimen by attempting to model certain field conditions. Results obtained from this method may be limited in their applicability to the specific conditions considered in the testing.
1.2 The test method is applicable for all geosynthetics.
1.3 The test method is not suited for the development of exact stress-strain relationships for the test specimen due to the non-uniform distribution of shearing forces and displacement.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 This standard does not purport to address all 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.

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09-Feb-2002
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ASTM D5321-02 - Standard Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method
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Designation:D 5321–02
Standard Test Method for
Determining the Coefficient of Soil and Geosynthetic or
Geosynthetic and Geosynthetic Friction by the Direct Shear
1
Method
This standard is issued under the fixed designation D 5321; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 3080 Test Method for Direct Shear Test of Soils Under
2
Consolidated Drained Conditions
1.1 This test method covers a procedure for determining the
D 3740 Practice for Minimum Requirements for Agencies
shear resistance of a geosynthetic against soil, or a geosyn-
Engaged in the Testing and/or Inspection of Soil and Rock
thetic against another geosynthetic, under a constant rate of
2
as Used in Engineering Design and Construction
deformation.
3
D 4354 Practice for Sampling of Geotextiles for Testing
1.1.1 The test method is intended to indicate the perfor-
3
D 4439 Terminology for Geotextiles
mance of the selected specimen by attempting to model certain
D 6243 Test Method for Determining the Internal and
field conditions. Results obtained from this method may be
Interface Shear Resistance of Geosynthetic Clay Liner by
limited in their applicability to the specific conditions consid-
3
the Direct Shear Method
ered in the testing.
1.2 The test method is applicable for all geosynthetics.
3. Terminology
1.3 The test method is not suited for the development of
3.1 Definitions—For definitions of terms relating to soil and
exact stress-strain relationships for the test specimen due to the
rock, refer to Terminology D 653. For definitions of terms
non-uniform distribution of shearing forces and displacement.
relating to geosynthetics, refer to Terminology D 4439.
1.4 The values stated in SI units are to be regarded as the
3.2 Descriptions of Terms Specific to This Standard:
standard. The values given in parentheses are for information
3.2.1 adhesion, n—the shearing resistance between two
c
only. a
adjacent materials under zero normal stress. Practically, this is
1.5 This standard does not purport to address all the safety
determined as the y-intercept of a straight line relating the
concerns, if any, associated with its use. It is the responsibility
limiting value of shear stress that resist slippage between two
of the user of this standard to establish appropriate safety and
materialsandthenormalstressacrossthecontactsurfaceofthe
health practices and determine the applicability of regulatory
two materials. (D 653, D-18)
limitations prior to use.
3.2.2 angle of friction, n—(angle of friction between two
2. Referenced Documents materials) (degrees) the angle whose tangent is the slope of the
line relating limiting value of the shear stress that resists
2.1 ASTM Standards:
slippage between two solid bodies and the normal stress across
D 653 Terminology Relating to Soil, Rock and Contained
2
the contact surface of the two bodies. Limiting value may be at
Fluids
the peak shear stress or at some other failure condition defined
D 698 Test Method for Laboratory Compaction Character-
3
by the user of the test results. This is commonly referred to as
istics of Soil Using Standard Effort (12 400 ft/lbf/ft (600
3
2 interface friction angle. (D 653, D-18)
kN/m/m ))
3.2.3 atmosphere for testing geosynthetics, n—air main-
D 1557 Test Method for Laboratory Compaction Character-
3
tained at a relative humidity of 65 6 5 % and temperature of
istics of Soil Using Modified Effort (56 000 ft-lbf/ft (2700
3
2
21 6 2°C (70 6 4°F). (D 4439)
kN/m/m )
3.2.4 coeffıcient of friction, n—The slope of the line relating
D 2435 Test Method for One-Dimensional Consolidation
2
limiting value of the shear stress that resists slippage between
Properties of Soils
two materials and the normal stress across the contact surface
of the two bodies. Limiting value may be at the peak shear
stress or at some other failure condition defined by the user.
1
This test method is under the jurisdiction of ASTM Committee D35 on
(D 653, D-18)
Geosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-
cal Properties.
Current edition approved Feb. 10, 2002. Published May 2002. Originally
published as D5321–92. Last previous edition D5321–92(1997)
2 3
Annual Book of ASTM Standards, Vol 04.08. Annual Book of ASTM Standards, Vol 04.13.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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D 5321–02
3.2.5 direct shear friction test, n—for geosynthetics,a Total sliding resistance may be a combination of sliding,
procedure in which the interface be
...

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