National foreword

This British Standard is the UK implementation of EN 12715:2020. It supersedes BS EN 12715:2000, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee B/526, Geotechnics.

A list of organizations represented on this committee can be obtained on request to its committee manager.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2020.

This European Standard was approved by CEN on 14 September 2020.

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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists 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, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

European foreword

This document (EN 12715:2020) has been prepared by Technical Committee CEN/TC 288 “Execution of special geotechnical works”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be withdrawn at the latest by month year May 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 12715:2000. The main changes compared to the previous edition are listed below:

generally, the text has been checked and brought up to date;
the Scope now includes Figure 1 to describe the various forms of grouting covered in this document;
normative references updated and now include reference to EN 1997 for design;
definitions updated and extended;
“site investigation” now changed to “ground investigation” in line with EN1997;
“design considerations” changed to “execution design” in line with EN1997;
Table 3 moved to Annex B;
Table 1 included in Clause 8 relating to revised grouting strategies;
Table B.2 added to characterise grouts;
Table 5 and A.1 replaced by Annex C with more types of testing included and standards referenced;
Glossary reviewed and updated;
Bibliography updated.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Introduction

The general scope of TC 288 is the standardization of the execution procedures for geotechnical works (including testing and control methods) and of the required material properties. WG18 has been charged to revise EN 12715:2000, with the subject area of grouting.

The design, planning and execution of grouting call for experience and knowledge in this specialized field. The execution phase requires skilled and qualified personnel and the present document cannot replace the expertise of specialist contractor.

This document has been prepared to complement EN 1997‑1, and EN 1997‑2.

Until EN 1997‑31 is published, the design of grouting works is not clearly defined. In particular, the boundary between design under the proposed EN 1997‑3 and design as part of the execution of grouting works has not been determined. This document has therefore adopted a distinction between execution design, i.e. the design of grouting methodology and the other phases of design.

Clause 7 “Execution Design” of this document expands on design only where necessary for the execution.

This document provides coverage of the construction and supervision requirements for grouting works.

1 Scope

This document is applicable to the execution, testing and monitoring of geotechnical grouting work.

Grouting for geotechnical purposes (geotechnical grouting) is a process in which the remote placement of a pumpable material in the ground is indirectly controlled by adjusting its rheological characteristics and by the manipulation of the placement parameters (pressure, volume and the flow rate).

The following principles and methods of geotechnical grouting are covered by this document:

displacement grouting (compaction and compensation grouting);
grouting without displacement of the host material (permeation, fissure/contact grouting, bulk filling).

Figure 1 illustrates the various injection methods associated with these two principles.

The principal objectives of geotechnical grouting are:

the modification of the hydraulic/hydrogeological characteristics of the ground;
the modification of the mechanical properties of the ground;
the filling of natural cavities, mine workings, voids adjacent to structures;
inducing displacement to compensate for ground loss or to stabilize and lift footings, slabs and pavements.

Specialized grouting activities, generally associated with structural and/or emergency works, are not covered by this document.

The execution, testing and monitoring of jet grouting work is not covered by this document and is covered by EN 12716.

2 Normative references

3 Terms and definitions

4 Information needed for the execution of work

4.1 General

4.2 Specific information

5 Ground investigation

5.1 General

5.2 Specific requirements

5.3 Field grouting trials and field tests

6 Materials and products

6.1 General

6.2 Grout materials

6.3 Grouts

7 Execution design

7.1 General

7.2 Execution design basis and objectives

7.3 Grouting principles and methods

7.4 Grout

7.5 Grout placement

7.6 Monitoring and control criteria

8 Execution

8.1 General

8.2 Drilling

8.3 Grout preparation

8.4 Grout placement

8.5 Grouting sequences

9 Supervision, testing and monitoring

9.1 General

9.2 Testing

9.3 Monitoring and control

10 Records

10.1 General

10.2 Documents produced on site

11 Special requirements (environment, site safety)

11.1 General

11.2 Health and safety

11.3 Environmental protection

Bibliography

BS EN 12715:2020

Execution of special geotechnical work. Grouting

Current

Published:

30 Nov 2020