NF P94-074

NF P94-074

October 1994
Standard Cancelled

Soils : investigation and testing. Shear strength tests with revolving triaxial test apparatus. Apparatus. Preparation of test specimens. Unconsolidated and undrained (UU) test. Consolidated and undrained (Cu+U) test with measurement of the interstitial pressure. Consolidated, drained (CD) test.

Ce document définit les caractéristiques de l'appareillage nécessaires pour la réalisation d'essais de cisaillement à l'appareil triaxial de révolution en compression, précise les conditions de préparation et de montage des éprouvettes et fournit les modalités de réalisation de l'essai (UU) non consolidé non drainé, de l'essai (CU + u) consolidé non drainé avec mesure de la pression interstitielle et de l'essai (CD) consolidé drainé.

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Collections

National standards and national normative documents

Publication date

October 1994

Number of pages

36 p.

Reference

NF P94-074

ICS Codes

93.020   Earthworks. Excavations. Foundation construction. Underground works

Classification index

P94-074

Print number

1 - 01/11/1994
Sumary
Soils : investigation and testing. Shear strength tests with revolving triaxial test apparatus. Apparatus. Preparation of test specimens. Unconsolidated and undrained (UU) test. Consolidated and undrained (Cu+U) test with measurement of the interstitial pressure. Consolidated, drained (CD) test.

Ce document définit les caractéristiques de l'appareillage nécessaires pour la réalisation d'essais de cisaillement à l'appareil triaxial de révolution en compression, précise les conditions de préparation et de montage des éprouvettes et fournit les modalités de réalisation de l'essai (UU) non consolidé non drainé, de l'essai (CU + u) consolidé non drainé avec mesure de la pression interstitielle et de l'essai (CD) consolidé drainé.
Standard replaced by (1)
NF EN ISO 17892-9
April 2018
Standard Current
Geotechnical investigation and testing - Laboratory testing of soil - Part 9 : consolidated triaxial compression tests on water saturated soils

ISO 17892-9:2018 specifies a method for consolidated triaxial compression tests on water-saturated soils. ISO 17892-9:2018 is applicable to the laboratory determination of triaxial shear strength under compression loading within the scope of geotechnical investigations. The cylindrical specimen, which can comprise undisturbed, re-compacted, remoulded or reconstituted soil, is subjected to an isotropic or an anisotropic stress under drained conditions and thereafter is sheared under undrained or drained conditions. The test allows the determination of shear strength, stress-strain relationships and effective stress paths. All stresses and strains are denoted as positive numerical values in compression. NOTE 1 This document provides a test for a single specimen. A set of at least three relatable tests are required to determine the shear strength parameters from these tests. Procedures for evaluating the results are included in Annex B and, where required, the shear strength parameters are to be included in the report. Special procedures such as: a) tests with lubricated ends; b) multi-stage tests; c) tests with zero lateral strain (K0) consolidation; d) tests with local measurement of strain or local measurement of pore pressure; e) tests without rubber membranes; f) extension tests; g) shearing where cell pressure varies, are not fully covered in this procedure. However, these specific tests can refer to general procedures described in this document. NOTE 2 This document fulfils the requirements of consolidated triaxial compression tests for geotechnical investigation and testing in accordance with EN 1997‑1 and EN 1997‑2.

Table of contents
  • 1 Domaine d'application
    4
  • 2 Références normatives
    4
  • 3 Généralités
    4
  • 3.1 Notations et symboles
    4
  • 3.2 Principe de l'essai
    6
  • 4 Caractéristiques de l'appareillage
    7
  • 4.1 Appareil triaxial
    7
  • 4.2 Appareillage annexe
    10
  • 4.3 Mesurage des paramètres de l'essai
    10
  • 5 Préparation et montage des éprouvettes
    12
  • 5.1 Contrôle de l'appareillage et préparation du local d'essai
    12
  • 5.2 Choix des dimensions des éprouvettes
    12
  • 5.3 Préparation des éprouvettes de sols cohérents
    12
  • 5.4 Préparation des éprouvettes de sols pulvérulents
    14
  • 5.5 Montage des éprouvettes dans la cellule
    14
  • 6 Essai (UU) non consolidé non drainé
    14
  • 6.1 Processus de l'essai
    15
  • 6.2 Expression des résultats
    16
  • 6.3 Procès-verbal d'essai
    16
  • 7 Essai (CU + u) consolidé non drainé avec mesure de la pression interstitielle
    18
  • 7.1 Processus de l'essai
    18
  • 7.2 Expression des résultats
    22
  • 7.3 Procès-verbal d'essai
    22
  • 8 Essai (CD) consolidé drainé
    25
  • 8.1 Processus de l'essai
    25
  • 8.2 Expression des résultats
    27
  • 8.3 Procès-verbal d'essai
    28
  • 9 Contrôles et vérifications de l'appareillage
    30
  • 9.1 Contrôle complet du circuit de mise en pression de la cellule
    30
  • 9.2 Contrôle complet du circuit de contre-pression
    30
  • 9.3 Contrôle préalable à l'essai du circuit de contre-pression
    30
  • 9.4 Contrôle complet des circuits de mesure de la pression interstitielle
    31
  • 9.5 Contrôle des membranes
    31
  • 9.6 Vérifications des instruments et moyens de mesure
    31
  • Annexe A (informative) Saturation des sols raides et gonflants
    32
  • Annexe B (normative) Corrections de section
    33
  • Annexe C (informative) Corrections sur la contrainte radiale Sigma3
    34
  • Annexe D (informative) Pression de consolidation
    35
  • Annexe E (informative) Évaluation de la vitesse d'écrasement des éprouvettes
    36
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