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Piping Rule Validation Tests

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Questions and Answers

What is the purpose of performing tests at different scales?

To investigate the effect of dike seepage length

To determine the influence of particle size on erosion

To validate the piping rule in formula (correct)

To study the role of relative density and uniformity

How was the piping rule extended based on the small-scale tests?

By accounting for the role of relative density, uniformity, and angularity (correct)

By adjusting the influence of particle diameter

By incorporating the effect of dike seepage length

By considering the influence of particle shape and angularity

What is the preliminary hypothesis regarding the role of particle diameter?

Larger particles require a higher critical head to initiate erosion

Smaller particles are better suited for a 2D erosion field approach (correct)

Particle diameter has no significant impact on the erosion process

Larger particles lead to more erosion due to increased discharge

How was the influence of particle diameter accounted for in the small-scale tests?

Through the particle exponent derived from multivariate analysis Signup and view all the answers

Which statement is true about the IJkdijk tests 1 and 3?

They were performed with fine sand, having a $d_{70}$ of $180 \mu m$ Signup and view all the answers

How well did the predictions by formula match the outcome of the backward erosion tests?

The predictions agreed well with the fine-tuning tests, but deviated for the coarse sand test. Signup and view all the answers

What factor appeared to play an important role in the formula for predicting critical head?

The scale factor Signup and view all the answers

How does the new piping rule presented in the text differ from the current rule?

It includes the influence of relative density, uniformity, and particle roundness. Signup and view all the answers

For what type of sand did the new piping rule perform well in predicting the outcome of the IJkdijk tests?

Fine sand Signup and view all the answers

What is the presumed reason for the difference in behavior between fine and coarse sands during the erosion process?

Fine sands develop as a front, while coarse sands tend to erode in smaller strips. Signup and view all the answers