Download Erosion in Geomechanics Applied to Dams and Levees by Stephane Bonelli PDF
By Stephane Bonelli
Erosion is the commonest reason behind disasters at earth-dams, dikes and levees, no matter if via overtopping and overflowing, or inner erosion and piping. This booklet is devoted to the phenomenon of inner erosion and piping. it isn't meant to be exhaustive at the topic, yet brings jointly many of the most up-to-date overseas learn and advances. Emphasis is put on actual tactics, how they are often studied within the laboratory, and the way try out effects may be utilized to levees and dams.
The effects from a number of study initiatives in Australia, France, the Netherlands and the U.S. are lined by way of the authors. Our target has been to proportion our most modern findings with scholars, researchers and practitioners. realizing the failure of an earth-dam or a levee by means of erosion in a unified framework, no matter if inner erosion or floor erosion, calls for non-stop examine during this box. we are hoping that the reader will achieve wisdom from this e-book that results in additional growth within the tough box of the security of levees and dams.
Contents
1. cutting-edge at the probability of inner Erosion of Dams and Levees through trying out, Robin Fell and Jean-Jacques Fry.
2. touch Erosion, Pierre Philippe, Remi Beguin and Yves-Henri Faure.
3. Backward Erosion Piping, Vera Van Beek, Adam Bezuijen and Hans Sellmeijer.
4. focused Leak Erosion, Stephane Bonelli, Robin Fell and Nadia Benahmed.
5. dating among the Erosion homes of Soils and different Parameters, Robin Fell, Gregory Hanson, Gontran Herrier, Didier Marot and Tony Wahl.
Content:
Chapter 1 state-of-the-art at the probability of inner Erosion of Dams and Levees via trying out (pages 1–99): Robin FELL and Jean?Jacques FRY
Chapter 2 touch Erosion (pages 101–191): Pierre PHILIPPE, Remi BEGUIN and Yves?Henri FAURE
Chapter three Backward Erosion Piping (pages 193–269): Vera VAN BEEK, Adam BEZUIJEN and Hans SELLMEIJER
Chapter four centred Leak Erosion (pages 271–341): Stephane BONELLI, Robin FELL and Nadia BENAHMED
Chapter five dating among the Erosion houses of Soils and different Parameters (pages 343–381): Robin FELL, Gregory HANSON, Gontran HERRIER, Didier MAROT and Tony WAHL
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Extra info for Erosion in Geomechanics Applied to Dams and Levees
Example text
It is unlikely to be an issue if the width of the valley base is greater than three quarters the dam height and the valley sides are flatter than 45°. 4. 7, adapted from Sherard et al. [SHE 63], shows the foundation conditions that are likely to lead to differential settlement and cracking or low-stress zones conducive to hydraulic fracture. 5% of the dam height, with steep changes in the foundation profile, are most likely to suffer cracking and hydraulic fracture. 2% of the dam height spread over some distance are unlikely to lead to cracking and low-stress zones.
This is one of the reasons why higher erosion rates are measured in JET than HET, as the HET is stopped with a relatively small hole diameter not allowing the “blocks” of soil to dislodge from the sides of the hole. This behavior was also noted in rotating cylinder tests by Lim [LIM 06]. 4. Effect of undrained shear strength or “cohesion” of the soil The erosion rate and critical shear stress are poorly related to the undrained shear strength or “cohesion” of the soil. Soils with similar undrained strengths can have an erosion rate 100 or 1,000 times different; and critical shear stresses ranging over 1 – 100 Pa depending on dispersion properties, clay mineralogy and degree of saturation.
1. 48 Erosion in Geomechanics Applied to Dams and Levees Sellmeijer et al. 25. 02 × 10–7 (k) where K is in m2 and k is in m/s. They indicate that they ignore the roundness and uniformity coefficient terms as they do not contribute significantly. They indicate that the refinements have been determined from the small-scale tests and it is not altogether clear if there may be a scale effect, so that the outcome for large structures may not be properly modeled. They also indicate that the equations should only apply within the limits of the parameters during testing.