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D6 Internal Erosion Risks for Embankments and Foundations

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D6 Internal Erosion Risks for Embankments and Foundations TABLE OF CONTENTS Page D-6 Internal Erosion Risks for Embankments and Foundations ................. D-6-1 D-6.1 Key Concepts ....................................................................... D-6-1 D-6.2 Historical Background ......................................................... D-6-1 D-6.3 Physical Location of Internal Erosion Categories ............... D-6-2 D-6.4 Processes of Internal Erosion ............................................... D-6-4 D-6.4.1 Scour .................................................................. D-6-5 D-6.4.2 Backward Erosion Piping .................................. D-6-7 D-6.4.3 Internal Migration .............................................. D-6-9 D-6.4.4 Internal Instability – Suffusion and Suffosion .................................................... D-6-10 D-6.5 Conceptual Framework for the Internal Erosion Process ........................................................................... D-6-11 D-6.5.1 Internal Erosion Process .................................. D-6-11 D-6.5.2 Event Trees ...................................................... D-6-11 D-6.5.3 Physical Locations of Failure Paths and Processes Combined .................................. D-6-13 D-6.6 Loading Considerations ..................................................... D-6-19 D-6.6.1 Dams Operated for Storage .............................. D-6-19 D-6.6.2 Dams and Levees Operated for Flood Risk Management ...................................... D-6-20 D-6.7 Initiation – Erosion Starts .................................................. D-6-21 D-6.7.1 Effect of Material Properties on Initiation ....... D-6-22 D-6.7.2 Effect of Hydraulic Conditions on Initiation ..................................................... D-6-27 D-6.7.3 Effect of Stress Conditions and Presence of “Flaws or Defects” on Initiation ............ D-6-33 D-6.7.4 Approach to Estimating the Probability that Internal Erosion Will Initiate .............. D-6-36 D-6.8 Continuation ....................................................................... D-6-38 D-6.8.1 Continuity ........................................................ D-6-39 D-6.8.2 Open Exit ......................................................... D-6-39 D-6.8.3 Filtered/Unfiltered Exit .................................... D-6-39 D-6.8.4 Constricted (Non-Erodible) Exit ...................... D-6-41 D-6.9 Progression ......................................................................... D-6-42 D-6.9.1 Progression – Continuous Stable Roof and/or Sidewalls ......................................... D-6-43 D-6.9.2 Progression – Constriction or Upstream Zone Fails to Limit Flows .......................... D-6-44 D-6.9.3 Progression – No Self-Healing Provided by Upstream Zone ...................................... D-6-45 D-6-i July 2019 Page D-6.9.4 Unsuccessful Intervention ................................ D-6-46 D-6.9.5 Assessing the Rate of Enlargement of a Pipe ............................................................ D-6-48 D-6.9.6 Breach .............................................................. D-6-50 D-6.9.7 Accounting for Uncertainty ............................. D-6-53 D-6.9.8 Relevant Case Histories ................................... D-6-53 D-6.9.9 Example ........................................................... D-6-60 D-6.10 References .......................................................................... D-6-60 D-6.10.1 Other Resources ............................................... D-6-69 Tables Page D-6-1 Piping Resistance of Soils (adapted from Sherard 1953) ............ D-6-26 D-6-2 Erosion Resistance of Soils from Concentrated Leaks (Scour) (adapted from ICOLD 2015) ...................................... D-6-26 D-6-3 Probability of Holding a Roof (adapted from Fell et al. 2008) ........................................................................ D-6-44 D-6-4 Rate of Erosion of the Embankment Core or Foundation Soil (adapted from Fell et al. 2001, 2003) ............................... D-6-49 D-6-5 Rate of Erosion of the Embankment Core or Foundation Soil (used in table D-6-4) (adapted from Fell et al. 2008) ...... D-6-49 D-6-6 Influence of the Material in the Downstream Zone of the Embankment on the Likely Time for Development of a Breach due to Gross Enlargement of a Pipe (used in table D-6-4) (adapted from Fell et al. 2003) .............. D-6-50 D-6-7 Qualitative Terms for Times of Development of Internal Erosion and Breach (adapted from Fell et al. 2003) ................ D-6-50 D-6-ii July 2019 Figures Page D-6-1 Internal erosion through the embankment. .................................... D-6-2 D-6-2 Internal erosion through the foundation. ........................................ D-6-3 D-6-3a Internal erosion of the embankment into the foundation. .............. D-6-3 D-6-3b Internal erosion along the embankment-foundation contact. ......... D-6-3 D-6-4 Internal erosion along or into embedded structures (adapted from FEMA 2005, 2008, and Fell et al. 2008). ........... D-6-4 D-6-5 Concentrated leak erosion (courtesy of Mark Foster). ................... D-6-6 D-6-6 Hydraulic fracture (courtesy of Mark Foster). ............................... D-6-6 D-6-7 Contact erosion process (Construction Industry Research and Information Association 2013). .......................................... D-6-8 D-6-8 Possible locations of initiation of contact erosion (Béguin et al. 2009). ................................................................... D-6-8 D-6-9 BEP (adapted from van Beek et al. 2011)...................................... D-6-9 D-6-10 Internal migration. ........................................................................ D-6-10 D-6-11 Internal instability (suffusion) (adapted from Ziems 1969). ........ D-6-11 D-6-12 Internal erosion through the embankment initiated by a concentrated leak (adapted from Fell et al. 2008). ................... D-6-12 D-6-13 Example of event tree for concentrated leak erosion. .................. D-6-14 D-6-14 Example of event tree for BEP. ................................................... D-6-15 D-6-15 Factors affecting the initiation of internal erosion (adapted from Garner and Fannin 2010 and ICOLD 2015). .................. D-6-22 D-6-16 Soils susceptible to BEP (de Wit et al. 1981; Townsend and Shiau 1986; van Beek et al. 2008; 2009). ......................... D-6-23 D-6-17 Potentially internally unstable soils (adapted from Wan and Fell 2004a). ....................................................................... D-6-24 D-6-18 Potentially internally unstable soils (Sherard 1979 and Reclamation 2011). .................................................................. D-6-24 D-6-19 Heave at the toe of an embankment (Pabst et al. 2012). ..................... 28 D-6-20 Uplift and/or blowout at the toe of an embankment (Pabst et al. 2012). ................................................................... D-6-29 D-6-21 Critical sand boil locations along Mississippi River levees (adapted from Ammerlaan 2007). ................................. D-6-31 D-6-22 Failure mode in-progress (not to scale). ...................................... D-6-57 D-6-23 Example. ...................................................................................... D-6-60 D-6-iii July 2019 Appendices D-6-A Large Dam Failure Statistics D-6-B Historical Frequencies D-6-C Concentrated Leak Erosion D-6-D Soil Contact Erosion D-6-E Critical Gradients for Evaluation of Backward Erosion Piping D-6-F Internal Instability (Suffusion) D-6-G Detailed List of Conditions which Increase the Likelihood of Initiation of an Internal Erosion Process D-6-H Continuation D-6-I Rate of Enlargement of a Pipe D-6-J Tables of More and Less Likely Factors for Different Categories of Internal Erosion List of Appendix D-6-J Tables D-6-J-1 Factors Influencing the Likelihood of Initiation of Internal Erosion Through an Embankment Dam D-6-J-2 Factors Influencing the Likelihood of Continuation of Internal Erosion D-6-J-3 Factors Influencing the Likelihood of Progression of Internal Erosion D-6-J-4 Factors Influencing the Likelihood that Intervention Fails for Internal Erosion D-6-J-5 Factors Influencing the Likelihood of Dam Breach D-6-J-6 Factors Influencing the Likelihood of Initiation of Internal Erosion through the Foundation D-6-J-7 Factors Influencing the Likelihood of Initiation of Internal Erosion of Embankment into Foundation D-6-iv July 2019 List of Appendix D-6-J Tables (continued) D-6-J-8 Factors Influencing the Likelihood of Initiation of Internal Erosion Into or Along a Conduit D-6-J-9.—Factors Influencing the Likelihood of Initiation of Internal Erosion into Drains D-6-v July 2019 D-6 INTERNAL EROSION RISKS FOR EMBANKMENTS AND FOUNDATIONS D-6.1 Key Concepts One of the leading causes of dam and levee failures in the United States is from internal erosion of embankments (or their foundations). Unfortunately, this is a potential failure mode that cannot be completely analyzed using numerical formulae or models. However, valuable information on embankment and foundation characteristics and behavior is available to help in assessing internal erosion risks. The term “internal erosion” is used as a generic term to describe erosion of soil particles by water passing through a body of soil. “Piping” is often used generically in the literature but refers to a specific internal erosion mechanism (described in “section D-6.4.2, Backward Erosion Piping.” D-6.2 Historical Background Based on the records of dam incidents and the dam register in International
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