Skip to Main Content
Book Chapter

C2 Earthworks

By
G. J. Hearn
G. J. Hearn
URS Scott Wilson Ltd, Scott House, Alençon Link, Basingstoke, Hampshire RG21 7PP, UK
Search for other works by this author on:
T. Hunt
T. Hunt
URS Scott Wilson Ltd, Scott House, Alençon Link, Basingstoke, Hampshire RG21 7PP, UK
Search for other works by this author on:
Published:
January 01, 2011

Abstract

The choice of cross-section on mountain roads is of critical importance. Even small increases in road width on steeply sloping ground can have a major impact on earthworks volumes and the need for retaining structures. An increase of road pavement width from 5 to 6 m, for example, can increase construction costs by as much as 50%; formation widths commonly adopted for roads in lowland terrain may be difficult to justify economically in hilly and mountainous areas. Furthermore, the greater the road width the greater the disturbance to the natural hillside and usually the larger the volumes of spoil required to be disposed of. These outcomes may exacerbate slope stability problems and necessitate a higher maintenance commitment in later years.

Many road projects involve the upgrading of existing roads through a combination of widening and improvements to the horizontal and vertical geometry. Widening into the cut slope will require slopes to be completely reformed and will invariably reactivate or trigger slope instability and erosion. Widening into the hillside can also be quite disruptive to traffic if the road is to be kept open at the same time. By contrast, widening on the outside edge of the road may encounter difficulties with the stability of fill slopes and the suitability of foundations for retaining structures (see discussion in Section A4.3).

For a new road in hilly or mountainous terrain there are essentially three main choices of cross-section: full-cut, part-cut/part-fill and full-fill, as shown in Text box C2.1. The cost

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Slope Engineering for Mountain Roads

Geological Society of London
Volume
24
ISBN electronic:
9781862393868
Publication date:
January 01, 2011

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal