Overview
EN ISO 22476-4:2021 - Geotechnical investigation and testing - Field testing - Part 4: Prebored pressuremeter test by Ménard procedure (ISO 22476-4:2021) - specifies the equipment, execution and reporting requirements for the Ménard prebored pressuremeter test. The standard describes the procedure for carrying out pressuremeter tests in natural ground and treated or untreated fills, both on land and offshore. Test results are intended for the quantitative determination of ground strength and deformation parameters, and can provide lithological information when combined with measuring-while-drilling data (ISO 22476-15) or sampling (ISO 22475-1).
Key topics and technical requirements
- Scope and intent: Defines when and how the Ménard pressuremeter test is applicable (prebored installation).
- Equipment: Requirements for pressuremeter probes (types and geometries), connecting lines, injected fluid and pressure/volume control units, including measurement and data-logging capabilities.
- Probe types: Updated guidance on probe designs (flexible covers, protective elements and slotted tubes) and their geometrical features (Annex A).
- Test procedure: Assembly, calibration, pocket preparation, probe placing (Annex C), loading programmes, guard-cell pressure for tri-cell probes, expansion cycles, reading/recording protocols and backfilling.
- Calibration and corrections: Procedures for instrument calibration and correction factors (Annex B) and guidance to assess measurement uncertainties (Annex E).
- Data handling and reporting: Required data sheets, raw and corrected pressuremeter curves, calculated parameters and mandatory contents of field and test reports (including pressuremeter log templates - Annex F).
- Parameter derivation: Methods to obtain pressuremeter parameters used in design are presented (Annex D).
- Safety and quality: Site safety requirements and quality control measures for reliable in situ testing.
Practical applications
- Characterisation of soil and soft rock stiffness and strength for foundation and earth-retaining designs.
- Assessment of deformation parameters for settlement prediction and numerical modelling.
- Onshore and offshore ground investigations where prebored pressuremeter testing is applicable.
- Complementary use with drilling logs, sampling and other in situ tests to improve subsurface models (cross-reference: EN 1997-2).
Who should use this standard
- Geotechnical engineers and consultants performing in situ testing.
- Field testing contractors and specialized laboratory teams.
- Project designers assessing foundation performance, earthworks and offshore structures.
- Regulators and clients seeking standardized test procedures and consistent reporting.
Related standards
Keywords: Ménard pressuremeter test, prebored pressuremeter, ISO 22476-4:2021, geotechnical investigation, in situ testing, pressuremeter probe, ground strength, deformation parameters.
