C6 Slope and Road Drainage
Published:January 01, 2011
Good drainage is a key element in the satisfactory functioning of all roads. In hilly and mountainous areas especially, drainage management is critical to the performance and stability of a road and its structures. Within very short periods of time intense rainfall can lead to landslides and extensive erosion on slopes, while sediment-laden storm runoff can cause blockage to drainage structures and scour of foundations and fill slopes. The control of surface water must therefore be uppermost in the minds of those responsible for the design, construction and maintenance of mountain roads.
Figures & Tables
Slope Engineering for Mountain Roads
This book provides a complete guide to the study, design, construction and management of landslide and slope engineering measures for mountain roads, with an emphasis on low-cost. The geographical focus of the book is on the tropics and sub-tropics, but is also highly relevant to other regions where heavy rain, steep slopes and weak soils and rocks combine to create slope instability. The causes and mechanisms of landslides are described, and the hazards they pose to mountain roads are illustrated. Methods of desk study, field mapping and ground investigation are reviewed and illustrated, with an emphasis on geomorphological and engineering geological techniques. The design and construction of alignments, earthworks, drainage, retaining structures, the stabilization of soil slopes and rock slopes, and the control of erosion on slopes and in rivers and streams are covered. Slope management as part of road maintenance and operation is reviewed, and procedures for risk assessment and works prioritization are described.