02-01-2013, 11:10 AM
DESIGN MANUAL FOR ROADS AND BRIDGES
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INTRODUCTION
General
This Part is an introduction to the whole Volume.
Volume 7 of the DMRB consists of a series of
linked documents. Table 3.1 in this Part gives a full list
of the documents and a clear chart of the contents of
each Part. Changes to Volume 7 are always in hand,
Table 3.1 will not necessarily include all the latest
amendments.
The Transport Research Laboratory (TRL),
previously operated as the Transport and Road Research
Laboratory (TRRL). Both abbreviations have been used
in Volume 7.
Mutual Recognition
Where Parts of Volume 7 give the Overseeing
Organisation’s requirements for products, they make
provision for the acceptance of equivalent products from
other member states of the European Community.
Reference should be made to the statement in each Part
concerned.
Miscellaneous
Volume 7 does not deal with seasonal or routine
maintenance, safety aspects other than skidding
resistance, or specialist aspects such as the surfacing of
bridge decks. For advice on these aspects reference
should be made to the Overseeing Organisation.
Frequent references are made to documents
contained in the Manual of Contract Documents for
Highway Works (MCHW) as follows:
- Specification for Highway Works (MCHW1).
- Notes for Guidance on the Specification for
Highway Works (MCHW2).
- Highway Construction Details (MCHW3).
References are made in the text to other
documents by author and date except for British
Standards, TRL/TRRL Reports and Overseeing
Organisation Publications, which are referred to by
number (or name) and date. A full list of References is
included in each Part.
BACKGROUND
Current UK practice in pavement design and
maintenance has developed from a combination of
practical experience, laboratory research and full-scale
road trials. Most of the research has been carried out
over a number of years by the Transport Research
Laboratory (TRL), some with the assistance of external
research contracts.
TRRL Report LR 1132 (1984) provides details of
UK research findings in connection with the design and
performance of flexible pavements. The report makes
use of the results of full-scale road experiments and uses
analytical techniques to rationalise and extend the data.
Many of the recommendations have since been adopted
by the Overseeing Organisations.
TRRL Report RR 87 (1987) provides comparable
findings in connection with rigid pavements and many of
the recommendations have also been adopted by the
Overseeing Organisations.
USE OF VOLUME 7
The order of the section in Volume 7 is generally
based on the life cycle of a road pavement, ie. design,
construction, assessment then maintenance (see Table
3.1). This starts with consideration of the cumulative
traffic loading which the pavement is required to carry,
followed by the design of the foundation, the roadbase or
main structural component and the surfacing. There is
then a need to assess the behaviour in service and to
design and carry out appropriate maintenance. It must,
however, be emphasised that there is interaction between
the components and that they cannot always be dealt
with in isolation. The following is a brief outline of the
contents of each of the sections and parts.