ISO 17892-7:2017

ISO 17892-7:2017

November 2017
International standard Current

Geotechnical investigation and testing - Laboratory testing of soil - Part 7: Unconfined compression test

ISO 17892-7:2017 specifies a method for the unconfined compression test.ISO 17892-7:2017 is applicable to the determination of the unconfined compressive strength for a homogeneous specimen of undisturbed, re-compacted, remoulded or reconstituted soil under compression loading within the scope of geotechnical investigations.This test method is useful to estimate the undrained shear strength of soil. It is noted that drainage is not prevented during this test. The estimated value for undrained shear strength is, therefore, only valid for soils of low permeability, which behave sufficiently undrained during the test.NOTE This document fulfils the requirements of unconfined compression tests for geotechnical investigation and testing in accordance with EN 1997‑1 and EN 1997‑2.

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International ISO standards

Publication date

November 2017

Number of pages

10 p.

Reference

ISO 17892-7:2017

ICS Codes

13.080.20   Physical properties of soils
93.020   Earthworks. Excavations. Foundation construction. Underground works

Print number

1
Sumary
Geotechnical investigation and testing - Laboratory testing of soil - Part 7: Unconfined compression test

ISO 17892-7:2017 specifies a method for the unconfined compression test.

ISO 17892-7:2017 is applicable to the determination of the unconfined compressive strength for a homogeneous specimen of undisturbed, re-compacted, remoulded or reconstituted soil under compression loading within the scope of geotechnical investigations.

This test method is useful to estimate the undrained shear strength of soil. It is noted that drainage is not prevented during this test. The estimated value for undrained shear strength is, therefore, only valid for soils of low permeability, which behave sufficiently undrained during the test.

NOTE This document fulfils the requirements of unconfined compression tests for geotechnical investigation and testing in accordance with EN 1997‑1 and EN 1997‑2.

Replaced standards (2)
ISO/TS 17892-7:2004
October 2004
Technical specification Cancelled
Geotechnical investigation and testing - Laboratory testing of soil - Part 7 : unconfined compression test on fine-grained soils

ISO/TS 17892-7:2004 covers the determination of an approximate value of the unconfined compressive strength for a square or cylindrical water-saturated homogeneous specimen of undisturbed or remoulded cohesive soil of sufficiently low permeability to keep itself undrained during the time it takes to perform the test within the scope of geotechnical investigations according to prEN 1997-1 and -2. The unconfined compressive strength of cohesive soils is a measure of the apparent cohesion. A cohesive soil behaves as if it is truly cohesive, e.g. clay and clayey soils, but most soils in this group behave cohesively due to negative pore pressure and friction and not due to actual cohesion. This test method is useful to derive the undrained shear strength of soil. It should however be noted that no provisions are taken to prevent drainage. The derived value for undrained shear strength is therefore only valid for soils of low permeability, which behave sufficiently undrained during testing. The method is not appropriate for fissured or varved clays or silts or peats.

ISO/TS 17892-7/AC1:2006
January 2006
Technical specification Cancelled
Technical corrigendum 1 to standard ISO/TS 17892-7:2004

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