By Stephane Bonelli
This e-book goals to carry major clinical development at the challenge of the erosion of geomaterials, targeting the mechanical/physical element. The chapters oscillate among a phenomenological outlook that's good grounded in experiments, and an procedure which could provide a modeling framework.
The easy mechanisms of inner and floor erosion are tackled one-by-one: filtration, suffusion, touch erosion, focused leak erosion, sediment and wind delivery, bedload shipping. those erosion mechanisms contain either hydraulic constructions (dams, dikes) and ordinary environments (wind, river, coastal).
In this booklet, physicists and mechanicians proportion with the reader their most up-to-date findings of their box paintings and research, whereas even as retaining an available layout. This compendium offers a well-documented details source, and specially, a device for coming near near the difficulty of abrasion of geomaterials in an up to date model for college kids, researchers and practitioners alike.
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Additional info for Erosion of Geomaterials
27, no. 3, pp. 295–303, 2004. 1. 1. Chapter objectives Flows within the interstitial pores of a soil may cause suffusion. This complex phenomenon corresponds to the process of detachment and then transport of the finest particles within the porous network. Suffusion may cause changes in porosity and can also lead to important modifications in the hydraulic and mechanical characteristics of the soil. Such modifications of the porous medium can also be the catalyst for significant instabilities at real scale of hydraulic structures.
The tectonic movement of the faults. – The post-earthquake shearing cracks. – The pipe leaks caused by corrosion, differential settlements of the pipe, or earthquakes. – The burrows dug by animals that have been seen in the crest of the narrower dikes. Process of Internal Erosion in Hydraulic Structures 15 – The holes caused by dead roots in argillaceous dikes (often where h < 6 m). – The alluviation of the masonry joints, which can be found in the hydraulic structures completed before the 19th Century.
Erosion resistance according to Sellmeijer is the result of three factors: – the resistance of the material, as a function of relative density, grain size distribution, and angularity; – the scaling effect, which is the ratio between the size of the grain and the cubic root of the traversed poral volume; and – the geometric effect, taking into account the impact of the thickness of the sand layer on the value of the driving hydraulic gradient at the bottom of the channel. Sellmeijer’s approach expresses the detachment condition starting from a mechanical model of the boundary balance of the grains at the edges of the hole, whereas Hoffman’s approach interprets these erosion thresholds through the transport condition, with the Shields parameter [HOF 08], thus emphasizing the scaling effect in a different way.
Erosion of Geomaterials by Stephane Bonelli