SIST EN ISO 17892-5:2017 PDF

Overview

EN ISO 17892-5:2017 - Geotechnical investigation and testing - Laboratory testing of soil - Part 5: Incremental loading oedometer test (ISO 17892-5:2017) - specifies internationally harmonized methods to determine the compressibility characteristics of soils using the incremental loading oedometer (oedometer) in the laboratory. The standard covers equipment, specimen preparation, measurement, loading sequences, data analysis and reporting for one‑dimensional consolidation tests performed on undisturbed, remoulded, recompacted or reconstituted specimens.

Key topics and requirements

• Test purpose: Determine soil compression, deformation characteristics and consolidation behaviour under discrete increments of vertical axial load.
• Specimen geometry: Cylindrical specimens confined laterally by a rigid ring; drainage permitted only through top and bottom faces (axial drainage).
• Loading procedure: Incremental loading and unloading steps with controlled application of axial stress and measurement of axial settlement with time.
• Measurement and analysis: Procedures to record specimen height, vertical strain, void ratio and to prepare compression‑stress diagrams for deriving compressibility parameters.
• Initial values: Requirements to report initial water content, bulk and dry density and specimen dimensions.
• Assumptions and limitations: Tests are generally analysed assuming saturation - parameters derived may be inappropriate for unsaturated soils. Small specimen size and one‑dimensional drainage/stress path can differ from three‑dimensional field conditions, so extrapolation to foundation behaviour requires engineering judgement.
• Quality and traceability: Includes calibration, maintenance and checks (annex) and mandatory/optional items for the test report.
• Conformance: Fulfils requirements for oedometer compressibility testing referenced in EN 1997‑1 and EN 1997‑2.

Applications and who uses it

• Applications: Foundation settlement prediction, consolidation analysis, ground improvement design, earthworks and embankment settlement assessment, and pre‑construction site investigation laboratory testing.
• Primary users: Geotechnical engineers, laboratory technicians, engineering consultants, academic researchers, contractors performing site investigation and laboratories seeking standardised compressibility data.
• Value: Provides reproducible, comparable laboratory results for use in design calculations and geotechnical reports, improving reliability of settlement and consolidation assessments.

Related standards

• ISO 17892‑1 (water content determination)
• ISO 14688‑1 (soil identification and description)
• EN 1997‑1 / EN 1997‑2 (Eurocode geotechnical design references)

Keywords: EN ISO 17892-5:2017, incremental loading oedometer test, oedometer test, soil compressibility, consolidation test, laboratory testing of soil, geotechnical investigation, settlement prediction.