On the Stability of a Fully Instrumented River Embankment Under Transient Conditions

C.G. Gragnano*, I. Bertolini, Irene Rocchi, G. Gottardi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review

Abstract

Time-dependent boundary conditions, uncertainties and variability of soil suction and water content of the filling material together with the use of proper retention and strength soil models are crucial aspects to be included for reliable analyses of the actual stability of river embankments. However, due to a typical lack of information in many practical cases, the use of simplistic assumptions on both hydraulic and mechanical response of earth infrastructures to hydrometric water level fluctuation and atmospheric loading is largely diffused, thus providing erroneous conclusions on the effective safety margins towards possible slope instability and collapse. Within this context, site measurements down to relevant depths, combined to an accurate soil characterization under partially saturated conditions, can be extremely useful to evaluate unsaturated variables (i.e. soil water content and suction) under transient flow conditions and hence carry out realistic stability analyses. A comprehensive monitoring system has been therefore designed and installed on a relevant representative section along river Secchia, a right-hand tributary of river Po (Northern Italy). The paper aims at presenting a methodological approach for a sustainable performance assessment of such geotechnical infrastructures, based on the complementary use of laboratory tests, field measurements and numerical analyses.
Original languageEnglish
Title of host publicationGeotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019
Volume40
Pages369-378
DOIs
Publication statusAccepted/In press - 2020
Event7th Italian National Congress of Geotechnical Researchers: Geotechnical Research for the Protection and Development of the Territory - Lecco, Italy
Duration: 3 Jul 20195 Jul 2019
Conference number: 7

Conference

Conference7th Italian National Congress of Geotechnical Researchers
Number7
CountryItaly
CityLecco
Period03/07/201905/07/2019
SeriesLecture Notes in Civil Engineering
Volume40
ISSN2366-2557

Keywords

  • River embankment
  • Slope stability
  • Field monitoring
  • Unsaturated soil
  • Transient flow

Cite this

Gragnano, C. G., Bertolini, I., Rocchi, I., & Gottardi, G. (Accepted/In press). On the Stability of a Fully Instrumented River Embankment Under Transient Conditions. In Geotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019 (Vol. 40, pp. 369-378). Lecture Notes in Civil Engineering, Vol.. 40 https://doi.org/10.1007/978-3-030-21359-6_39
Gragnano, C.G. ; Bertolini, I. ; Rocchi, Irene ; Gottardi, G. / On the Stability of a Fully Instrumented River Embankment Under Transient Conditions. Geotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019. Vol. 40 2020. pp. 369-378 (Lecture Notes in Civil Engineering, Vol. 40).
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Gragnano, CG, Bertolini, I, Rocchi, I & Gottardi, G 2020, On the Stability of a Fully Instrumented River Embankment Under Transient Conditions. in Geotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019. vol. 40, Lecture Notes in Civil Engineering, vol. 40, pp. 369-378, 7th Italian National Congress of Geotechnical Researchers, Lecco, Italy, 03/07/2019. https://doi.org/10.1007/978-3-030-21359-6_39

On the Stability of a Fully Instrumented River Embankment Under Transient Conditions. / Gragnano, C.G.; Bertolini, I.; Rocchi, Irene; Gottardi, G.

Geotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019. Vol. 40 2020. p. 369-378 (Lecture Notes in Civil Engineering, Vol. 40).

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review

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T1 - On the Stability of a Fully Instrumented River Embankment Under Transient Conditions

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AU - Rocchi, Irene

AU - Gottardi, G.

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N2 - Time-dependent boundary conditions, uncertainties and variability of soil suction and water content of the filling material together with the use of proper retention and strength soil models are crucial aspects to be included for reliable analyses of the actual stability of river embankments. However, due to a typical lack of information in many practical cases, the use of simplistic assumptions on both hydraulic and mechanical response of earth infrastructures to hydrometric water level fluctuation and atmospheric loading is largely diffused, thus providing erroneous conclusions on the effective safety margins towards possible slope instability and collapse. Within this context, site measurements down to relevant depths, combined to an accurate soil characterization under partially saturated conditions, can be extremely useful to evaluate unsaturated variables (i.e. soil water content and suction) under transient flow conditions and hence carry out realistic stability analyses. A comprehensive monitoring system has been therefore designed and installed on a relevant representative section along river Secchia, a right-hand tributary of river Po (Northern Italy). The paper aims at presenting a methodological approach for a sustainable performance assessment of such geotechnical infrastructures, based on the complementary use of laboratory tests, field measurements and numerical analyses.

AB - Time-dependent boundary conditions, uncertainties and variability of soil suction and water content of the filling material together with the use of proper retention and strength soil models are crucial aspects to be included for reliable analyses of the actual stability of river embankments. However, due to a typical lack of information in many practical cases, the use of simplistic assumptions on both hydraulic and mechanical response of earth infrastructures to hydrometric water level fluctuation and atmospheric loading is largely diffused, thus providing erroneous conclusions on the effective safety margins towards possible slope instability and collapse. Within this context, site measurements down to relevant depths, combined to an accurate soil characterization under partially saturated conditions, can be extremely useful to evaluate unsaturated variables (i.e. soil water content and suction) under transient flow conditions and hence carry out realistic stability analyses. A comprehensive monitoring system has been therefore designed and installed on a relevant representative section along river Secchia, a right-hand tributary of river Po (Northern Italy). The paper aims at presenting a methodological approach for a sustainable performance assessment of such geotechnical infrastructures, based on the complementary use of laboratory tests, field measurements and numerical analyses.

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Gragnano CG, Bertolini I, Rocchi I, Gottardi G. On the Stability of a Fully Instrumented River Embankment Under Transient Conditions. In Geotechnical Research for Land Protection and Development: Proceedings of CNRIG 2019. Vol. 40. 2020. p. 369-378. (Lecture Notes in Civil Engineering, Vol. 40). https://doi.org/10.1007/978-3-030-21359-6_39