Self-Healing of Concentrated Leaks at Core-Filter Interfaces in Earth Dams

Lakshmi N. Reddi, Sai Prasad Kakuturu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Concentrated leaks at core-filter interfaces in earth dams increase erodibility of soils, which may lead to catastrophic failures. In this paper, mathematical and experimental testing methods are suggested to determine the self-healing nature of these leaks. The methods are fundamentally different from the existing empirical methods in that they do not involve comparison of particle sizes of the base (D 85) and filter (D 15) soils. They are based on the fundamental processes of particle transport and deposition phenomena. An advection-type equation is used with a deposition coefficient (λ) to describe particle transport in filters. The nature of particle deposition at the interface, which is described by an exponential attenuation function with respect to distance, is used to infer the possibility of self-healing. The experimental method involves extension of a test previously published in this journal. The method essentially involves a flow pump to evaluate the erodibility of base soils, determine λ and characterize the filters, and test combined base soil-filter systems to evaluate self-healing potential of a number of filters relative to each other. The results from the experimental method using three different filters and a Group II base soil were interpreted and analyzed using the mathematical model. The methods suggest that the entire particle-size distribution, and not mere D 15, governs particle accumulation at the interface. The proposed methods are useful for relative comparison of self-healing capabilities of various filters for a given base soil.

Original languageEnglish (US)
Pages (from-to)89-98
Number of pages10
JournalGeotechnical Testing Journal
Volume27
Issue number1
StatePublished - Jan 2004

Fingerprint

Embankment dams
earth dam
filter
Soils
soil
erodibility
particle size
Advection
Particle size analysis
self potential
testing method
method
Particle size
Pumps
Mathematical models
pump
advection
Testing
particle

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences (miscellaneous)
  • Geotechnical Engineering and Engineering Geology

Cite this

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title = "Self-Healing of Concentrated Leaks at Core-Filter Interfaces in Earth Dams",
abstract = "Concentrated leaks at core-filter interfaces in earth dams increase erodibility of soils, which may lead to catastrophic failures. In this paper, mathematical and experimental testing methods are suggested to determine the self-healing nature of these leaks. The methods are fundamentally different from the existing empirical methods in that they do not involve comparison of particle sizes of the base (D 85) and filter (D 15) soils. They are based on the fundamental processes of particle transport and deposition phenomena. An advection-type equation is used with a deposition coefficient (λ) to describe particle transport in filters. The nature of particle deposition at the interface, which is described by an exponential attenuation function with respect to distance, is used to infer the possibility of self-healing. The experimental method involves extension of a test previously published in this journal. The method essentially involves a flow pump to evaluate the erodibility of base soils, determine λ and characterize the filters, and test combined base soil-filter systems to evaluate self-healing potential of a number of filters relative to each other. The results from the experimental method using three different filters and a Group II base soil were interpreted and analyzed using the mathematical model. The methods suggest that the entire particle-size distribution, and not mere D 15, governs particle accumulation at the interface. The proposed methods are useful for relative comparison of self-healing capabilities of various filters for a given base soil.",
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Self-Healing of Concentrated Leaks at Core-Filter Interfaces in Earth Dams. / Reddi, Lakshmi N.; Kakuturu, Sai Prasad.

In: Geotechnical Testing Journal, Vol. 27, No. 1, 01.2004, p. 89-98.

Research output: Contribution to journalArticle

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