Technical report on sand boils (piping)

Anonymus, A.

Technical report on sand boils (piping)

Title

Technical report on sand boils (piping)

Author

Anonymus, A.

Corporate name

Rijkswaterstaat

Project

TAW/ENW

Date

1999-01-01

Abstract

Piping and hydraulic fracturing (heave) are phenomena which can threaten the stability of flood defences. These phenomena can arise when, in the case of large-scale hydraulic head, particles of soil in layers of earth which are susceptible to erosion are transported underneath the flood defence by the seepage flow, as a consequence of which erosion channels are created under the flood defence (piping), or mutual effective stress is lost in the soil (heave) in the upward seepage flow behind the hydraulic structure or cut-off wall. Within the scope of designing new flood defences or reinforcing or monitoring existing ones, safeguards against the occurrence of these phenomena must be verified. Various calculation rules are available to verify such safeguards, varying from simple empirical rules for the first (reinforcement) design for a flood defence or safety monitoring of an existing flood defence, to advanced calculation models to design or test more precisely. The recommended approach and calculation rules in these publications are not state-of-the-art, bearing in mind the developments in this field in the past few years. New developments are recorded in research reports which are often insufficiently accessible for day-to-day design and test practice. All in all, the knowledge available for practical application is fragmented.

Subject

piping
heave
hydraulic fracturing
sand boils

Classification

TPN100400

To reference this document use:

http://resolver.tudelft.nl/uuid:f6d03006-7744-452e-8ff2-a4914f118184

Publisher

Rijkswaterstaat, DWW

Source

English translation of a TAW guideline

Part of collection

Hydraulic Engineering Reports