FprEN 17542-4

SLOVENSKI STANDARD
01-december-2025
Zemeljska dela - Geotehnični laboratorijski preskusi - 4. del: Preskusna metoda za
merjenje potenciala zrušitve tal
Earthworks - Geotechnical laboratory tests - Part 4: Test method for measurement of
collapse potential of soils
Erdarbeiten - Geotechnische Laborversuche - Teil 4: Prüfmethode zur Messung des
Einsturzpotentials von Böden
Ta slovenski standard je istoveten z: prEN 17542-4
ICS:
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 17542-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 93.020
English Version
Earthworks - Geotechnical laboratory tests - Part 4: Test
method for measurement of collapse potential of soils
Erdarbeiten - Geotechnische Laborversuche - Teil 4:
Prüfmethode zur Messung des Einsturzpotentials von
Böden
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 396.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
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United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17542-4:2025 E
worldwide for CEN national Members.

prEN 17542-4:2025 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus . 6
5 Specimen specification . 6
6 Test method . 7
6.1 Description of the method . 7
6.2 Procedure . 7
7 Test report . 7
Annex A (informative) Measurement of collapse of soils according to prEN 17542-4 – Test report
............................................................................................................................................................................... 9
Annex B (informative) Evaluation of the degree of collapse . 13
Bibliography . 14

prEN 17542-4:2025 (E)
European foreword
This document (prEN 17542-4:2025) has been prepared by Technical Committee
CEN/TC 396 “Earthworks”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
prEN 17542-4:2025 (E)
Introduction
The collapse of a soil is the decrease of height that can occur when unsaturated soils are immersed. This
document defines the collapse index and the collapse potential that qualifies this phenomenon.
NOTE A collapsible soil can withstand relatively large applied vertical stress with small settlement while it has
a low water content and degree of saturation, but this soil will exhibit settlement (that could be large) after wetting
with no additional increase in stress.
prEN 17542-4:2025 (E)
1 Scope
This document specifies the test method for the determination of the magnitude of one-dimensional
collapse that occurs when unsaturated soils are inundated with water. This method is used to determine
two parameters related with the collapsibility of a soil: the collapse index and the collapse potential.
This test method specifies the technique for specimen preparation, the apparatus and the procedure for
quantifying the amount of height change associated with collapse and procedures for reporting test
results.
The procedure given in this test method is applicable to both undisturbed samples or remolded
specimens. It is a one single sample test procedure.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN ISO 17892-1, Geotechnical investigation and testing — Laboratory testing of soil — Part 1:
Determination of water content (ISO 17892-1)
EN ISO 17892-2, Geotechnical investigation and testing — Laboratory testing of soil — Part 2:
Determination of bulk density (ISO 17892-2)
EN ISO 17892-5, Geotechnical investigation and testing — Laboratory testing of soil — Part 5: Incremental
loading œdometer test (ISO 17892-5)
EN ISO 22475-1, Geotechnical investigation and testing — Sampling methods and groundwater
measurements — Part 1: Technical principles for the sampling of soil, rock and groundwater (ISO 22475-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
collapse
decrease in height of a confined soil with a given water content and a given dry unit weight after wetting
at a constant applied vertical stress
Note 1 to entry: This stress is to be determined as appropriate for the design situation.
3.2
collapse index
I
sc
decrease in height of a specimen consolidated to a given vertical stress after flooding, ex
...