โ Scribed by T.B. Edil; L.E. Vallejo
No coin nor oath required. For personal study only.
Shoreline erosion results in landslides and complex slope processes, under appropriate conditions, in unconsolidated materials forming the coastal bluffs. Shoreline erosion and bluff recession along most of the Great Lakes shoreline results in losses in millions of dollars annually. An understanding of bluff recession and the trends in the evolution of coastal bluffs is required for an evaluation of engineering and management solutions for the problems created. The factors effectlng changes in bluff geometry include wave action, frost action, seepage effects, sheet wash, and weathering.
An overview of the physical processes as they affect slope evolution, the available mechanical models, and the influence of slope parameters on the stability of the coastal bluffs are presented. The response of coastal slopes to the action of these factors is viewed as shallow failures and downslope transport as well as deep rotational slips. A distinction between the stability against deep slips which is termed as quasi-stability and the ultimate stability is made. The progress of slope evolution in coastal bluffs can be predicted with successive applications of the two-dimensional circular slip limit equilibrium analysis of slope stability using the effective stress method.
The influence of slope parameters, namely, geometry (slope height and inclination), material properties (strength parameters and unit weight), and the relative position of the groundwater table on the limiting stability conditions of uniform slopes is presented based on such a limit equilibrium analysis. The relative influence of some of these parameters varies with slope height and the slopes can be viewed as low and high slopes with a height of 25 m as an approximate demarcation between the two groups.
๐ SIMILAR VOLUMES
Results are presented of a sequence of laboratory tests undertaken to elucidate the behaviour of deep-seated landslides. In deep-seated failures deformation has been reported at depths of up to 250 m. In the movement zone, owing to the weight of the overburden and the surrounding stress environment,