Global Stability of a Dam: Difference between revisions

Revision as of 16:52, 14 December 2022

Learn more about the need to consider uplift pressure when designing a gravity structure at DamFailures.org

When a dam impounds a body of water, it will experience a load or force commonly referred to as hydrostatic pressure. A variety of other forces such as uplift pressure, earth pressure, silt pressure, wave pressure, wind pressure, ice pressure, seismic acceleration, hydrodynamic pressure, and thermal stress from ambient temperature changes can also act on the dam depending upon site conditions. Global stability refers to the ability of the dam to withstand all design loading conditions with adequate safety margin. This is a function of the geometry and material properties of the dam as well as the magnitude and combination of loads acting on the structure.

Required Data

Evaluation Criteria

Types of Analyses

Examples

Learn more about the need to consider uplift pressure (DamFailures.org)

Learn from the critical oversights that led to the failure of St. Francis Dam (DamFailures.org)

Best Practices Resources

Design Standards No. 13: Embankment Dams (Ch. 6 Bulkhead Gates and Stoplogs), USBR, 2018

Design and Construction Considerations for Hydraulic Structures: Roller-Compacted Concrete, USBR, 2017

Strength Design for Reinforced Concrete Hydraulic Structures (EM 1110-2-2104), USACE, 2016

Design Standards No. 13: Embankment Dams (Ch. 13: Seismic Analysis and Design), USBR, 2015

Design of Hydraulic Steel Structures (ETL 1110-2-584), USACE, 2014

Design Standards No. 13: Embankment Dams (Ch. 9 Static Deformation Analysis), USBR, 2011

Design Standards No. 13: Embankment Dams (Ch. 4 Static Stability Analysis), USBR, 2011

Calculating Forces on Components of Hydraulic Structures (ERDC/CHL CHETN-IX-21), USACE, 2009

Earthquake Design and Evaluation of Concrete Hydraulic Structures (EM 1110-2-6053), USACE, 2007

Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE, 2005

Roller-Compacted Concrete (EM 1110-2-2006), USACE, 2000

Gravity Dam Design (EM 1110-2-2200), USACE, 1995

Arch Dam Design (EM 1110-2-2201), USACE, 1994

Lock Gates and Operating Equipment (EM 1110-2-2703), USACE, 1994

Nonlinear, Incremental Structural Analysis of Massive Concrete Structures (ETL 1110-2-365), USACE, 1994

Design of Small Dams, USBR, 1987

Trainings

On-Demand Webinar: Rehabilitation of Concrete Dams

On-Demand Webinar: Stability Evaluations of Concrete Dams

On-Demand Webinar: Analysis of Concrete Arch Dams

On-Demand Webinar: Introduction to Concrete Gravity Dams

Citations:

Revision ID: 5669
Revision Date: 12/14/2022

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 | [[Image:GravityDamUplift1.png|350px|x350px|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/]]
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-|style="text-align:center; font-size:90%;"| Learn more [[about]] the need to consider uplift pressure when designing a gravity structure at [https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ DamFailures.org]
+|style="text-align:center; font-size:90%;"| Learn more about the need to consider uplift pressure when designing a gravity structure at [https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ DamFailures.org]
 |}
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-"Design and evaluation of hydraulic structures requires and understanding of the interaction between the flow and the components of the structure. The non-hydrostatic forces generated by the flowing water are of particular interest. Historically, [[Physical Models|physical models]] have been the primary means for predicting hydrodynamic forces on hydraulic structures. Laboratory studies of hydraulic loadings require relatively large-scale [[Physical Models|physical models]] which are expensive to construct, instrument, and operate. The hydraulic evaluation costs can be decreased if computational methods are used in lieu of such [[Physical Models|physical models]] studies. Numerical models capable of calculating hydraulic loads on bridge piers, lock guard walls, culvert valves, tainter valves, floodwalls, and moored ships will result in more cost-effective [[structural]], mechanical, and geotechnical designs."<ref name="ERDC/CHL CHETN-IX-21">[[Calculating Forces on Components of Hydraulic Structures (ERDC/CHL CHETN-IX-21) | Calculating Forces on Components of Hydraulic Structures (ERDC/CHL CHETN-IX-21), USACE, 2009]]</ref>
+When a dam impounds a body of water, it will experience a load or force commonly referred to as hydrostatic pressure. A variety of other forces such as uplift pressure, earth pressure, silt pressure, wave pressure, wind pressure, ice pressure, [[seismic]] acceleration, hydrodynamic pressure, and thermal stress from ambient temperature changes can also act on the dam depending upon site conditions. Global [[stability]] refers to the ability of the dam to withstand all design loading conditions with adequate safety margin. This is a function of the geometry and material properties of the dam as well as the magnitude and combination of loads acting on the structure.
 ==Required Data==