SIST-TS CEN ISO/TS 17892-8:2004
(Main)Geotechnical investigation and testing - Laboratory testing of soil - Part 8: Unconsolidated undrained triaxial test (ISO/TS 17892-8:2004)
Geotechnical investigation and testing - Laboratory testing of soil - Part 8: Unconsolidated undrained triaxial test (ISO/TS 17892-8:2004)
This document specifies the test method for the determination of the compressive strength of a cylindrical, water-saturated specimen of undisturbed or remoulded cohesive soil when first subjected to an isotropic stress without allowing any drainage from the specimen, and thereafter sheared under undrained conditions within the scope of the geotechnical investigations according to prEN 1997 1 and 2.
NOTE "Water-saturated" refers to the in-situ condition. The material tested need not necessarily be saturated at all stages during the laboratory testing.
Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 8: Unkonsolidierter undränierter Triaxialversuch (ISO/TS 17892-8:2004)
Diese Technische Spezifikation legt das Verfahren zur Bestimmung der Spannungs-Dehnungs-Beziehungen eines zylindrischen, wassergesättigten Probekörpers aus ungestörtem oder aufbereitetem kohäsiven Boden, der ausgehend von einer unkonsolidierten isotropen Belastung unter undränierten Bedingungen abgeschert wird im Rahmen geotechnischer Untersuchungen nach ENV 1997-1 und ENV 1997-2 fest.
ANMERKUNG ?Wassergesättigt" bezieht sich auf den Zustand in situ. Die Bodenprobe muss nicht notwendigerweise während des gesamten Laborversuchs gesättigt sein.
Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 8: Essai triaxial non consolidé non drainé (ISO/TS 17892-8:2004)
Cette Spécification Technique concerne la détermination de la résistance d'une éprouvette cylindrique de sol non remanié ou remanié, saturée d'eau, présentant de la cohésion ou cohésion résiduelle, lorsqu'elle est soumise a une contrainte isotrope en conditions non drainées, puis cisaillée en conditions non drainées dans le domaine d'application des reconnaissances géotechniques conforme aux normes ENV 1997 parties 1 et 2.
NOTE Le terme saturé d'eau se rapporte aux conditions en place. Le matériau soumis a l'essai ne doit pas nécessairement etre saturé a tout instant durant l'essai de laboratoire.
Geotehnično preiskovanje in preskušanje – Laboratorijsko preskušanje zemljin – 8. del: Nekonsolidirani nedrenirani triosni preskus (ISO/TS 17892-8:2004)
Ta dokument določa preskusno metodo za ugotavljanje tlačne trdnosti valjastega z vodo zasičenega vzorca nespremenjene ali preoblikovane kohezivne zemljine, na katero najprej deluje izotropna napetost, ki ne omogoča drenaže iz vzorca, nato pa se striže pod nedreniranimi pogoji v okviru geotehničnih preiskav v skladu s prEN 1997-1 in -2.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TS CEN ISO/TS 17892-8:2004
01-december-2004
*HRWHKQLþQRSUHLVNRYDQMHLQSUHVNXãDQMH±/DERUDWRULMVNRSUHVNXãDQMH]HPOMLQ±
GHO 1HNRQVROLGLUDQLQHGUHQLUDQLWULRVQLSUHVNXV ,6276
Geotechnical investigation and testing - Laboratory testing of soil - Part 8:
Unconsolidated undrained triaxial test (ISO/TS 17892-8:2004)
Geotechnische Erkundung und Untersuchung - Laborversuche an Bodenproben - Teil 8:
Unkonsolidierter undränierter Triaxialversuch (ISO/TS 17892-8:2004)
Reconnaissance et essais géotechniques - Essais de laboratoire sur les sols - Partie 8:
Essai triaxial non consolidé non drainé (ISO/TS 17892-8:2004)
Ta slovenski standard je istoveten z: CEN ISO/TS 17892-8:2004
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
SIST-TS CEN ISO/TS 17892-8:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
---------------------- Page: 2 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
TECHNICAL SPECIFICATION
CEN ISO/TS 17892-8
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2004
ICS 13.080.20; 93.020
English version
Geotechnical investigation and testing - Laboratory testing of
soil - Part 8: Unconsolidated undrained triaxial test (ISO/TS
17892-8:2004)
Reconnaissance et essais géotechniques - Essais de sol Geotechnische Erkundung und Untersuchung -
au laboratoire - Partie 8 : Essai triaxial non consolidé non Laborversuche an Bodenproben - Teil 8: Unkonsolidierter
drainé (ISO/TS 17892-8:2004) undränierter Triaxialversuch (ISO/TS 17892-8:2004)
This Technical Specification (CEN/TS) was approved by CEN on 2 February 2004 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 17892-8:2004: E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
Contents
page
Foreword.3
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Symbols .5
5 Equipment .6
6 Test procedure.8
7 Test results.10
8 Test report .11
Bibliography .13
Figures
Figure 1 — Example of a triaxial test unit .6
2
---------------------- Page: 4 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
Foreword
This document (CEN ISO/TS 17892-8:2004) 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 Technical Specification: 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 on fine-grained soils.
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.
3
---------------------- Page: 5 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
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]).
4
---------------------- Page: 6 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
1 Scope
This document specifies the test method for the determination of the compressive strength of a cylindrical, water-
saturated specimen of undisturbed or remoulded cohesive soil when first subjected to an isotropic stress without
allowing any drainage from the specimen, and thereafter sheared under undrained conditions within the scope of
the geotechnical investigations according to prEN 1997-1 and -2.
NOTE "Water-saturated" refers to the in-situ condition. The material tested need not necessarily be saturated at all stages
during the laboratory testing.
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.
CEN ISO/TS 17892-1, Geotechnical investigation and testing — Laboratory testing of soil — Part 1: Determination
of water content (ISO/TS 17892-1:2004) .
CEN ISO/TS 17892-2, Geotechnical investigation and testing — Laboratory testing of soil — Part 2: Determination
of density of fine grained soil (ISO/TS 17892-2:2004).
CEN ISO/TS 17892-3, Geotechnical investigation and testing — Laboratory testing of soils — Part 3: Determination
of density of soild particles — Pycnometer method (ISO/TS 17892-3:2004).
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
failure
stress of strain condition at which failure takes place
3.2
cohesive soils
soils that behave as if they were actually cohesive, e.g. clay and clayey soils
NOTE Most soils in this group behave cohesively due to negative pore pressure and friction, and not due to cohesion.
3.3
undisturbed sample
normally sample of quality class 1 according to prEN 1997-2
NOTE If no specification for the failure state is given, failure may be considered to occur at the peak deviator stress.
4 Symbols
ε vertical strain during shearing.
1
σ minor principal stress or cell pressure.
3
σ major principal stress or vertical stress.
1
5
---------------------- Page: 7 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
σ - σ deviator stress.
1 3
5 Equipment
5.1 General
A schematic diagram of an apparatus for triaxial testing is shown in Figure 1. The requirements for an apparatus
are given in the following sections.
Key
1 alternative positions for load measuring
device
2 air bleed
3 vertical compression measuring device
4 piston
5 top cap
6 soil specimen
7 rubber membrane
8 pedestal
9 device for measurement and control of
cell pressure
10 triaxial cell
P vertical load
Figure 1 — Example of a triaxial test unit
5.2 Triaxial cell
5.2.1 The triaxial cell shall be able to withstand the cell pressure without significant leakage of cell fluid out of the
cell.
NOTE A cell with a maximum cell pressure of 1500 kPa will be sufficient for nearly all cases. Transparent cells are
recommended.
5.2.2 The sealing bushing and piston guide shall be designed such that the piston runs smoothly and maintains
alignment.
5.2.3 The testing procedure, the accuracy of the load measuring device, the design of the piston, its sealing and
guide and the design of the connection between the piston and the top cap shall be such that the load at failure is
known within ± 3 % or within ± 1 N, whichever is the greater (see NOTE).
The laboratory shall ensure that this accuracy can be achieved with the worst possible combination of vertical and
horizontal force and bending moment acting at that end of the piston that sticks into the triaxial cell. If the load
measuring device is situated outside the triaxial cell (see Figure 1), it shall be ensured that the friction between the
piston and it's sealing bushing is low enough or repeatable enough to permit the failure load to be determined with
the required accuracy.
NOTE Smooth running of the piston when subjected to no horizontal load and no cell pressure is no guarantee that this is
the case.
6
---------------------- Page: 8 ----------------------
SIST-TS CEN ISO/TS 17892-8:2004
CEN ISO/TS 17892-8:2004 (E)
If the load measuring device is situated inside the triaxial cell, it shall be ensured that the device is sufficiently
insensitive to horizontal forces and/or bending moments to achieve the required accuracy. The influence of the cell
pressure on the load cell, if any, shall be sufficiently repeatable to be corrected for.
5.2.4 The top cap and the pedestal and the connection between the top cap and the piston shall be designed
such that their deformations are negligible compared to the deformations of the soil specimen.
5.2.5 The diameter of the top cap and of the pedestal should normally be equal to the diameter of the specimen.
Specimens with diameters smaller than the diameter of the end caps may be tested provided cavities under the
membrane at the ends of the specimen can be avoided.
5.2.6 The vertical stress applied on the specimen due to the weight of the top cap may not exceed 3 % of the
unconfined compressive strength (compressive strength is equal to two times the shear strength) of the specimen
or 1 kPa whichever is the greater.
5.3 Confining membrane
5.3.1 The soil specimen shall be confined by an elastic membrane which effectively prevents the cell fluid from
penetrating into the specimen. If rubber membranes are used, membranes with following properties should be
used:
Unstretched diameter between 95 % and 100 % of specimen diameter (after being stored in water);
thickness not exceeding about 1 % of the specimen diameter;
elastic modulus (measured in tension) not exceeding 1600 kPA.
5.3.2 Confining membranes that give a correction on the deviator stress (σ - σ ) of more than 10 % at failure
1 3
should not be used.
5.3.3 If O-rings are used to seal the confining membrane to the top cap and to the pedestal, their dimensions
and elastic properties shall be such that the confining membrane is firmly sealed to the top cap and to the pedestal.
5.4 Cell pressure device
5.4.1 The device for maintaining the cell pressure constant shall be accurate enough to keep the required cell
pressure constant within ± 2 % or ± 1,0 kPa, whichever is greater.
5.4.2 The tubings between the triaxial cell and the cell pressure sensor shall be wide enough to ensure negligible
pressure difference between these two components.
5.5 Loading press
5.5.1 The loading press shall be able to provide the rates of vertical strain according to 6.5. The actual rate may
not deviate more than ± 10 % from the required value. The movement of the press shall be smooth without
fluctuations or vibrations.
NOTE A loading press with a maximum load capacity of 10 kN and which is able to advance the
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.