Construction Of Road Embankments Research Articles

Erosion control practices applied to granitic roadfills for forest roads in Idaho: Cost effectiveness evaluation

AbstractCost effectiveness of six alternative road embankment construction practices and 16 alternative fill‐slope stabilization practices was evaluated as means for controlling erosion on forest roads built on granitic soils in Idaho (USA). A total of 63 bordered erosion plots 1‐8 m wide by 4‐6 m long, were used. Eroded material was collected in troughs at the bottom of each plot in the spring and fall. Measurements began in the fall of 1981 and continued until the fall of 1983. Costs were obtained by tabulating actual labor, equipment, and supplies used to install the treatments. Rainfall erosivity values accumulated for the snow‐free periods between erosion measurements proved to be a statistically significant covariate for the analysis of treatment effects. There were no significant differences between the three embankment construction practices (sidecast, layer placed, and controlled compaction). But surface rolling did significantly increase erosion in all cases. Nine of the post‐construction soil stabilization measures significantly reduced erosion, and one measure significantly increased erosion (P < 0‐5). Stabilization measures that combined mulches with revegetation appeared to be more beneficial for erosion control than either mulches or revegetation alone. Rankings of the erosion control effectiveness of individual soil stabilization practices were different from the rankings of the cost effectiveness of the practices. Application of alternative treatments is discussed.

Road embankment construction on unstable colluvial soil slopes : Uriel, A O; Ortuno, L; Morales, F Proc 5th International Symposium on Landslides, Lausanne, 10–15 July 1988V2, P1007–1010. Publ Rotterdam: A A Balkema, 1988

Road embankment construction on unstable colluvial soil slopes : Uriel, A O; Ortuno, L; Morales, F Proc 5th International Symposium on Landslides, Lausanne, 10–15 July 1988V2, P1007–1010. Publ Rotterdam: A A Balkema, 1988

Depositional characteristics of estuarine alluvium: some engineering implications

Summary A review of sea level change during the Flandrian period concludes that a steady rather than oscillatory rise has occurred. In Britain the eustatic rise has been modified by isostatic effects; these are reflected in slightly different sea level curves for the Severn, Thames and Clyde estuaries. Higher undrained shear strengths recorded in the outer Thames estuary and taken to imply a transgressive/regressive sequence are inconclusive of an oscillatory curve; such desiccated horizons are not present in the Severn Levels. The pattern of sea level rise is reflected in the nature of the sediment. The characteristics of a silty sand deposited during a period of rapid sea level rise and overlain by a laminated mud/silty sand sequence with occasional peat horizons are discussed. A proposed description for laminae thickness is presented. Bioturbation may modify the sediment character of tidal river environments. Tidal pills, common in salt marsh areas, are difficult to detect when infilled. The geotechnical affects of the features are related to their different consolidation properties and skin friction compared with the normally deposited (layered) sediments. The importance of laminations in soils to lateral pore water dissipation and the implications for road embankment construction are considered.

Stability of Road Embankments in Soft Clay

Slides in soft marine clays frequently occur during construction of road embankments in Norway. This paper outlines the routine procedure used for a stability analysis of such embankments, based on a total stress concept. Using these procedures, eight slides were investigated, and it was found that the minimum factor of safety obtained could give a too conservative picture of the actual conditions. The minimum factor of safety, which is the one normally used, varied between 0.73 and 1.10. Taking all uncertainties into consideration, an analysis based on a total stress concept as outlined herein must be considered acceptable. The study gives no basis for evaluating the accuracy of the measured shear strength values.