BS EN ISO 17892-5-2017 PDF

Full title and description

STB BS EN ISO 17892-5:2017 — Geotechnical investigation and testing — Laboratory testing of soil — Part 5: Incremental loading oedometer test. This standard specifies the method for determining the compressibility and one-dimensional consolidation behaviour of soils using an incremental-loading oedometer (fixed- or floating-ring cells) on undisturbed, remoulded, recompacted or reconstituted specimens.

Abstract

ISO 17892-5:2017 defines the procedure for performing incremental loading oedometer (consolidation) tests: specimen preparation and dimensions, apparatus (rings, porous discs, loading system), test sequence of discrete load increments and unloads, drainage conditions, measurement of deformation and time, calculation of compressibility parameters (mv, Eoed), coefficient of consolidation and optional swelling-pressure determination. The method is intended for geotechnical investigations and design where settlement and compressibility properties are required.

General information

• Status: Published and confirmed (current).
• Publication date: February 2017 (Edition 1, 2017-02).
• Publisher: International Organization for Standardization (ISO); published/adopted nationally/regionally as EN ISO and BS EN ISO by CEN/BSI.
• ICS / categories: 93.020 (Soil quality, geotechnics); 13.080.20 (Laboratory testing of soils).
• Edition / version: Edition 1 (ISO 17892-5:2017).
• Number of pages: 26 pages (ISO published document length).

Key bibliographic and lifecycle information (status, edition and page count) is taken from the ISO record and the adopted EN/BS version.

Scope

This part of ISO 17892 specifies laboratory procedures for determining compression and deformation characteristics of soils by incremental loading in an oedometer. The test measures vertical deformation under successive discrete vertical stress increments while allowing vertical drainage; it is used to derive parameters used in settlement and foundation design (e.g., coefficient of volume compressibility, oedometer modulus, coefficient of consolidation, and apparent pre-consolidation pressure). The standard notes limitations where small specimen size and unsaturated conditions can affect representativeness of field behaviour.

Key topics and requirements

• Test specimen: cylindrical sample confined by a rigid oedometer ring; requirements for specimen dimensions and condition (undisturbed, remoulded, recompacted or reconstituted).
• Apparatus: fixed- or floating-ring oedometer cells, porous discs, loading cap/weights or calibrated load cell, dial or electronic deformation measurement; calibration and verification requirements.
• Loading sequence: defined discrete load increments and optional unloading steps, with specified timing and drainage conditions for each increment.
• Measurements and corrections: vertical deformation/time records, corrections for apparatus deformation, computation of strain and void ratio changes.
• Calculated parameters: coefficient of volume compressibility (mv), oedometer modulus (Eoed), coefficient of consolidation (cv), pre-consolidation pressure, and optional swelling pressure.
• Reporting: mandatory and optional results and test conditions to be reported for traceability and design use.

These technical requirements and calculation methods are set out in the standard text and supporting annexes.

Typical use and users

The standard is used by geotechnical laboratories, engineering consultancies, research organisations and contractors to obtain reliable consolidation/compressibility parameters for foundation and settlement design, ground improvement assessment and consolidation analyses. Typical users include geotechnical engineers, laboratory technicians, and quality-assurance personnel performing site investigation testing for buildings, earthworks, embankments and infrastructure projects. Laboratory service providers commonly offer consolidation testing to the requirements of BS EN ISO 17892-5:2017.

Related standards

Related and frequently referenced standards and documents include other parts of the ISO 17892 series (laboratory testing of soils), national standards such as BS 1377-5 (oedometer/consolidation methods), ASTM D2435 (incremental consolidation in the USA) and various EN/ISO parts addressing sample preparation, permeability and classification. For consolidated testing procedures and conversions between methods, consult adjacent ISO 17892 parts and relevant national/adopted standards.

Keywords

oedometer; consolidation; incremental loading; compressibility; coefficient of consolidation; oedometer modulus; pre-consolidation pressure; laboratory soil testing; ISO 17892-5; BS EN ISO 17892-5:2017.

FAQ

Q: What is this standard?

A: It is ISO 17892-5:2017 (published as BS EN ISO 17892-5:2017 in applicable regional/national catalogs), which specifies the incremental-loading oedometer (one-dimensional consolidation) test method for determining soil compressibility properties.

Q: What does it cover?

A: Apparatus, specimen preparation, test procedure (load increments and drainage), measurement and correction methods, calculation of compressibility parameters (mv, Eoed, cv), optional swelling-pressure determination, and recommended reporting requirements. Limitations relating to specimen representativity and unsaturated soils are noted.

Q: Who typically uses it?

A: Geotechnical laboratories, engineering consultancies, contractors and researchers performing consolidation testing for settlement and foundation design. Laboratory technicians, geotechnical engineers and QA managers rely on the standard to ensure consistent, comparable consolidation test results.

Q: Is it current or superseded?

A: ISO 17892-5:2017 is the current published edition (first edition, February 2017). The ISO record indicates the publication was reviewed and confirmed (review action) in subsequent ISO lifecycle checks (confirmed status). It supersedes earlier technical specifications (ISO/TS) on the same subject. Users should check their national adoption (BS/EN) for any national corrigenda.

Q: Is it part of a series?

A: Yes — it is Part 5 of the ISO 17892 series (Laboratory testing of soil). Other parts in the series cover complementary laboratory tests (water content, particle size, Atterberg limits, permeability, shear strength, etc.).

Q: What are the key keywords?

A: oedometer, consolidation, compressibility, incremental loading, coefficient of consolidation, oedometer modulus, pre-consolidation pressure, laboratory soil testing, ISO 17892-5.