Geotechnical Aspects and Stability of Road Cuts in the Blue Nile Basin,Ethiopia |
| |
Authors: | Lulseged Ayalew Dietmar Moeller Gerhard Reik |
| |
Institution: | (1) University of Hamburg, Technical Information Systems (TIS), Vogt Koelln Strasse 30, 22527 Hamburg, Germany |
| |
Abstract: | Road construction in the Blue Nile basin is largely determined by geotechnical factors. The area is characterized by steep
slopes and has a history of landsliding. The geological formations range from Mesozoic sedimentary to Tertiary volcanic rocks
making the stratigraphic makeup sensitive to deformation and failure. The heterogeneity of these rocks also means it is difficult
to depend on results of stability analyses alone for road design and construction. As an alternative, ratios of cut-slope
lengths to cut-slope heights have been developed in this study based on the performances of unsupported natural and artificial
cuts and some stability analyses. Hence, road cuts on cliffs of hard rocks need a horizontal to vertical ratio of 0.25:1.
Slopes made up of weak rocks can remain stable at a threshold angle of 45°. For heterogeneous slopes, it is advisable to use
different road cuts depending on material makeup, and the degree of weathering and consolidation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|