CEN ISO/TS 17892-6:2004

SLOVENSKI STANDARD
01-december-2004
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Geotechnical investigation and testing - Laboratory testing of soil - Part 6: Fall cone test
(ISO/TS 17892-6:2004)
Goetechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 6:
Fallkegelversuch (ISO/TS 17892-6:2004)
Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 6:
Essai de pénétration de cône (ISO/TS 17892-6:2004)
Ta slovenski standard je istoveten z: CEN ISO/TS 17892-6:2004
ICS:
13.080.20 Fizikalne lastnosti tal Physical properties of soils
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN ISO/TS 17892-6
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2004
ICS 93.020
English version
Geotechnical investigation and testing - Laboratory testing of
soil - Part 6: Fall cone test (ISO/TS 17892-6:2004)
Reconnaissance et essais géotechniques - Essais de sol Goetechnische Erkundung und Untersuchung -
au laboratoire - Partie 6: Essai au cône (ISO/TS 17892- Laborversuche an Bodenproben - Teil 6: Fallkegelversuch
6:2004) (ISO/TS 17892-6:2004)
This Technical Specification (CEN/TS) was approved by CEN on 20 October 2003 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 17892-6:2004: E
worldwide for CEN national Members.

Contents page
Foreword.3
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Equipment .6
5 Test procedure.7
6 Test results.10
7 Test report .11
Bibliography .12

Figures
Figure 1 — Example of a fall-cone .6
Figure 2 — Fall-cone test on remoulded soil.8
Figure 3 — Fall-cone test on undisturbed soil .8

Tables
Table 1 — Set of fall-cones - typical masses and dimensions .6

Foreword
This document (CEN ISO/TS 17892-6:2004) has been prepared by Technical Committee CEN/TC 341
“Geotechnical investigation and testing”, the secretariat of which is held by DIN, in collaboration with Technical
Committee ISO/TC 182 “Geotechnics”.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
CEN ISO/TS 17892 consists of the following parts, under the general title “Geotechnical investigation and testing
— Laboratory testing of soil”:
 Part 1: Determination of water content.
 Part 2: Determination of density of fine grained soil.
 Part 3: Determination of particle density - Pycnometer method.
 Part 4: Determination of particle size distribution.
 Part 5: Incremental loading oedometer test.
 Part 6: Fall cone test.
 Part 7: Unconfined compression test.
 Part 8: Unconsolidated undrained triaxial test.
 Part 9: Consolidated triaxial compression tests.
 Part 10: Direct shear tests.
 Part 11: Permeability tests.
 Part 12: Determination of Atterberg limits.
Introduction
This document covers areas in the international field of geotechnical engineering never previously standardised. It
is intended that this document presents broad good practice throughout the world and significant differences with
national documents is not anticipated. It is based on international practice (see [1]).
1 Scope
This document specifies the laboratory determination of undrained shear strength of both undisturbed and
remoulded specimen of saturated fine grained cohesive soils by use of a fall-cone.
This document specifies the fall-cone test, in which a cone is allowed to fall with its tip towards a soil specimen,
whereupon the penetration of the cone into the soil is measured. Tests performed according to this test yield
penetration values which can be used to estimate the undrained shear strength.
The test is applicable to both undisturbed and remoulded soil test specimen.
For undisturbed soil test specimen, the results of the test are dependent on the quality of the specimen. Because of
possible effects of anisotropy, it can also differ depending on what undrained shear strength the relation refers to.
The evaluated value of the undrained shear strength of the 'undisturbed' soil refers to its state during the test in the
laboratory. This value is not necessarily indicative of the undrained shear strength of the soil in its natural state in
the field. Therefore, the test should be regarded as an index test.
NOTE 1 For non-homogeneous soil samples, this method yields values of the undrained shear strength which are less
representative for the bulk shear strength of the sample than other tests involving a larger volume of soil.
NOTE 2 For disturbed soil samples and fissured soil samples this method normally yields higher strength values than tests
involving a larger volume of soil.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
prEN 1997-1, Eurocode 7 - Geotechnical design — Part 1: General rules.
prEN 1997-2, Eurocode 7 - Geotechnical design - Part 2: Ground investigation and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
undrained shear strength
c
u
the shear strength of a saturated fine grained soil determined in such a way that the soil remains undrained during
the shearing process
3.2
fall-cone undrained shear strength
c
ufc
the undrained shear strength determined using a fall-cone apparatus
3.3
undisturbed sample
normally a sample of quality class 1 according to prEN 1997-2
4 Equipment
4.1 Cone apparatus
4.1.1 The apparatus shall permit the cone to be held firmly initially and to be released instantaneously to fall
freely in the vertical direction into the soil specimen.
4.1.2 The apparatus shall have a mechanism which allows the cone to be raised or lowered and adjusted in such
way that the tip of the cone just touches the surface of the specimen before the cone is released.
4.1.3 The cone apparatus shall be equipped with a scale or other read off unit with such grading and resolution
that the depth of the cone penetration, which shall be within 5 mm to 20 mm, can be read off to a resolution of
± 0,1 mm after the release of the cone.
4.2 Fall-cones
4.2.1 A set of cones with cone angles of 30° or 60° and masses covering the whole range of possible shear
strengths shall be used. A typical set of four fall cones is given on Table 1. The 60 g/60° cone is shown in Figure 1
as a typical example of such a cone.
Table 1 — Set of fall-cones - typical masses and dimensions
Mass g 10 60 80 100 400
Tip angle ß ° 60 60 30 30 30
Key
1 index line
2 cone tip
a is the deviation from the geometrical tip at
manufacturing
b is the maximum wear
h is the height of the conical tip

β is the tip angle
Figure 1 — Example of a fall-cone
4.2.2 When readings are taken manually, there shall be a distinct index line at the top of each shaft which shall
be clearly visible in the reading scale.
4.2.3 The cones shall be made of stainless material and have smooth polished surfaces with an average
roughness R of less than 0,8 µm. Cones with obvious wear or scratches shall be replaced.
a
4.2.4 The masses
...