ISO 17892-10:2018
Geotechnical investigation and testing — Laboratory testing of soil — Part 10: Direct shear tests
This document specifies two laboratory test methods for the determination of the effective shear strength of soils under consolidated drained conditions using either a shearbox or a ring shear device.
This document is applicable to the laboratory determination of effective shear strength parameters for soils in direct shear within the scope of geotechnical investigations.
The tests included in this document are for undisturbed, remoulded, re-compacted or reconstituted soils. The procedure describes the requirements of a determination of the shear resistance of a specimen under a single vertical (normal) stress. Generally three or more similar specimens from one soil are prepared for shearing under three or more different vertical pressures to allow the shear strength parameters to be determined in accordance with Annex B.
Special procedures for preparation and testing the specimen, such as staged loading and pre-shearing or for interface tests between soils and other materials, are not covered in the procedure of this document.
NOTE This document fulfils the requirements of the determination of the drained shear strength of soils in direct shear for geotechnical investigation and testing in accordance with EN 1997-1 and EN 1997-2.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Apparatus
5.1 General
5.2 Shear devices
5.2.1 Shearbox test apparatus
5.2.2 Ring shear apparatus
5.3 Loading-devices
5.4 Measuring devices
5.4.1 Load measuring devices
5.4.2 Torque measuring devices
5.4.3 Displacement measuring devices
5.5 Ancillary apparatus
6 Test procedure
6.1 General requirements
6.2 Preparation of specimen
6.2.1 General requirements and selection of the preparation method
6.2.2 General requirements for preparation of specimens from undisturbed samples
6.2.3 Trimming from extruded or block samples
6.2.4 Extrusion from a tube of diameter larger than the mould and cutter
6.2.5 Preparation of laboratory fabricated specimens
6.3 Measurements before testing
6.4 Equipment preparation
6.5 Consolidation
6.6 Shearing
7 Test results
7.1 Water content
7.2 Initial dry density
7.3 Initial bulk density
7.4 Initial void ratio
7.5 Initial degree of saturation
7.6 Void ratio during testing
7.7 Stresses and displacements
7.7.1 Shearbox
7.7.2 Ring shear
7.8 Plotting
8 Test report
8.1 Mandatory reporting
8.2 Optional reporting
Annex A (normative) Calibration, maintenance and checks
Annex B (informative) Additional calculations for effective strength parameters
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Apparatus
5.1 General
5.2 Shear devices
5.2.1 Shearbox test apparatus
5.2.2 Ring shear apparatus
5.3 Loading-devices
5.4 Measuring devices
5.4.1 Load measuring devices
5.4.2 Torque measuring devices
5.4.3 Displacement measuring devices
5.5 Ancillary apparatus
6 Test procedure
6.1 General requirements
6.2 Preparation of specimen
6.2.1 General requirements and selection of the preparation method
6.2.2 General requirements for preparation of specimens from undisturbed samples
6.2.3 Trimming from extruded or block samples
6.2.4 Extrusion from a tube of diameter larger than the mould and cutter
6.2.5 Preparation of laboratory fabricated specimens
6.3 Measurements before testing
6.4 Equipment preparation
6.5 Consolidation
6.6 Shearing
7 Test results
7.1 Water content
7.2 Initial dry density
7.3 Initial bulk density
7.4 Initial void ratio
7.5 Initial degree of saturation
7.6 Void ratio during testing
7.7 Stresses and displacements
7.7.1 Shearbox
7.7.2 Ring shear
7.8 Plotting
8 Test report
8.1 Mandatory reporting
8.2 Optional reporting
Annex A (normative) Calibration, maintenance and checks
Annex B (informative) Additional calculations for effective strength parameters
Bibliography