Internal Stability (Stresses) - Revision history

Mpollei@gfnet.com at 15:16, 21 July 2023

2023-07-21T15:16:06Z

← Older revision		Revision as of 15:16, 21 July 2023
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	{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE]]		{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE]]
	{{Document Icon}} [[Arch Dam Design (EM 1110-2-2201) \| Arch Dam Design (EM 1110-2-2201), USACE]]		{{Document Icon}} [[Arch Dam Design (EM 1110-2-2201) \| Arch Dam Design (EM 1110-2-2201), USACE]]
	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR~~, 1987~~]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR]]

	==Trainings==		==Trainings==

Mpollei@gfnet.com at 20:50, 11 July 2023

2023-07-11T20:50:16Z

← Older revision		Revision as of 20:50, 11 July 2023
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Stability Analysis of Concrete Structures (EM 1110-2-2100) \| Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE~~, 2005~~]]		{{Document Icon}} [[Stability Analysis of Concrete Structures (EM 1110-2-2100) \| Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE]]
	{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE~~, 1995~~]]		{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE]]
	{{Document Icon}} [[Arch Dam Design (EM 1110-2-2201) \| Arch Dam Design (EM 1110-2-2201), USACE~~, 1994~~]]		{{Document Icon}} [[Arch Dam Design (EM 1110-2-2201) \| Arch Dam Design (EM 1110-2-2201), USACE]]
	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR, 1987]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR, 1987]]

Rmanwaring at 20:27, 20 December 2022

2022-12-20T20:27:25Z

← Older revision		Revision as of 20:27, 20 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->

	Internal [[stability]] failures occur at individual joints, lift surfaces, or other weak planes internal to a dam structure rather than the structure as a whole. This may include sliding on lift surfaces or exceedance of allowable material strengths. <ref name="EM2100">[[Stability Analysis of Concrete Structures (EM 1110-2-2100)\|Stability Analysis of Concrete Structures (EM 1110-2-2100) ~~(U.S. Army Corps of Engineers)~~]]</ref>		Internal [[stability]] failures occur at individual joints, lift surfaces, or other weak planes internal to a dam structure rather than the structure as a whole. This may include sliding on lift surfaces or exceedance of allowable material strengths. <ref name="EM2100">[[Stability Analysis of Concrete Structures (EM 1110-2-2100) \| Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE, 2005]]</ref>

	==Examples==		==Examples==

Grichards at 18:02, 14 December 2022

2022-12-14T18:02:29Z

← Older revision		Revision as of 18:02, 14 December 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/]]		\| [[Image:GravityDamUplift1.png\|350px\|x350px\|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/]]
	\|-		\|-
	\|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]
	\|}		\|}

	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->

	~~"Water pressures caused by reservoir water and tailwater~~ occur ~~within the dam and foundation in pores~~, ~~cracks~~, ~~joints, and seams. The distribution of~~ internal ~~water pressures along~~ a ~~horizontal section through the~~ dam ~~or its foundation is assumed to vary linearly from full reservoir pressure at~~ the ~~upstream face to zero~~ or ~~tailwater pressure at the downstream face in the absence~~ of ~~drains or a more detailed analysis~~."<ref name="~~Small Dams~~">[[~~Design~~ of ~~Small Dams~~ \| ~~Design~~ of ~~Small Dams, USBR, 1987]]</ref>~~		Internal [[stability]] failures occur at individual joints, lift surfaces, or other weak planes internal to a dam structure rather than the structure as a whole. This may include sliding on lift surfaces or exceedance of allowable material strengths. <ref name="EM2100">[[Stability Analysis of Concrete Structures (EM 1110-2-2100)\|Stability Analysis of Concrete Structures (EM 1110-2-2100) (U.S. Army Corps of Engineers)]]</ref>

	~~"The internal water pressure, also called uplift, acts to reduce the compressive stresses normal to a horizontal section through the dam~~. ~~Including a line of vertical formed drains within the dam and parallel to the upstream face serves to reduce the uplift force~~. ~~The uplift reduction is dependent on the size, location, and spacing~~ of ~~the drains.<ref name="Small Dams"/>~~

	"Forces from water pressures also occur within the foundation. Uplift forces in the foundation decrease the normal forces occurring on potential sliding planes. Water forces occurring on high angle joints increase driving forces on foundation blocks. Both of these reduce foundation sliding [[stability]].<~~ref name="Small Dams"~~/>

	"The uplift forces within the foundation and along the foundation-dam contact can be reduced by a line of drain holes drilled into the foundation from the floor of the foundation gallery. The internal pressure distribution through the foundation depends on depth, location, and orientation of the drains, rock permeability characteristics, jointing, faulting, and any other geologic features that may modify the flow. The line of drains should be located a distance downstream from the upstream dam face that will ensure that direct connection from the reservoir will not occur."<ref ~~name="Small Dams"/~~>

	==Examples==		==Examples==
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	{{Website Icon}} [https://damfailures.org/case-study/st-francis-dam-california-1928/ Case study: St. Francis Dam Failure (Damfailures.org)]		{{Website Icon}} [https://damfailures.org/case-study/st-francis-dam-california-1928/ Case study: St. Francis Dam Failure (Damfailures.org)]

	==[[Best Practices Resources]]==		==Best Practices Resources==
	{{Document Icon}} [[Stability Analysis of Concrete Structures (EM 1110-2-2100) \| Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE, 2005]]		{{Document Icon}} [[Stability Analysis of Concrete Structures (EM 1110-2-2100) \| Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE, 2005]]
	{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE, 1995]]		{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) \| Gravity Dam Design (EM 1110-2-2200), USACE, 1995]]
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	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR, 1987]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR, 1987]]

	==[[Trainings]]==		==Trainings==
	{{Video Icon}} [[On-Demand Webinar: Introduction to Concrete Gravity Dams]]		{{Video Icon}} [[On-Demand Webinar: Introduction to Concrete Gravity Dams]]
	{{Video Icon}} [[On-Demand Webinar: Uplift and Drainage for Concrete Dams and Spillways]]		{{Video Icon}} [[On-Demand Webinar: Uplift and Drainage for Concrete Dams and Spillways]]

Grichards at 05:37, 18 November 2022

2022-11-18T05:37:45Z

← Older revision		Revision as of 05:37, 18 November 2022
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	__NOTOC__		__NOTOC__
			[[Category:Global Stability of a Dam]]
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Rmanwaring: Created page with " NOTOC ---- {| align="right" style="width:10%;" cellpadding="7" | link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ |- |style="text-align:center; font-size:90%;"| Learn more about the need to consider uplift pressure when designing a gravity structure at [..."

2022-11-17T22:17:18Z

Created page with " __NOTOC__ ---- {| align="right" style="width:10%;" cellpadding="7" | 350px|x350px|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ |- |style="text-align:center; font-size:90%;"| Learn more about the need to consider uplift pressure when designing a gravity structure at [..."

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__NOTOC__
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{| align="right" style="width:10%;" cellpadding="7"
| [[Image:GravityDamUplift1.png|350px|x350px|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/]]
|-
|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]
|}



"Water pressures caused by reservoir water and tailwater occur within the dam and foundation in pores, cracks, joints, and seams. The distribution of internal water pressures along a horizontal section through the dam or its foundation is assumed to vary linearly from full reservoir pressure at the upstream face to zero or tailwater pressure at the downstream face in the absence of drains or a more detailed analysis."<ref name="Small Dams">[[Design of Small Dams | Design of Small Dams, USBR, 1987]]</ref>

"The internal water pressure, also called uplift, acts to reduce the compressive stresses normal to a horizontal section through the dam. Including a line of vertical formed drains within the dam and parallel to the upstream face serves to reduce the uplift force. The uplift reduction is dependent on the size, location, and spacing of the drains.<ref name="Small Dams"/>

"Forces from water pressures also occur within the foundation. Uplift forces in the foundation decrease the normal forces occurring on potential sliding planes. Water forces occurring on high angle joints increase driving forces on foundation blocks. Both of these reduce foundation sliding [[stability]].<ref name="Small Dams"/>

"The uplift forces within the foundation and along the foundation-dam contact can be reduced by a line of drain holes drilled into the foundation from the floor of the foundation gallery. The internal pressure distribution through the foundation depends on depth, location, and orientation of the drains, rock permeability characteristics, jointing, faulting, and any other geologic features that may modify the flow. The line of drains should be located a distance downstream from the upstream dam face that will ensure that direct connection from the reservoir will not occur."<ref name="Small Dams"/>

==Examples==
{{Website Icon}} [https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ Lesson learned: Concrete gravity dams should be evaluated to accommodate full uplift (Damfailures.org)]
{{Website Icon}} [https://damfailures.org/case-study/oroville-dam-california-2017/ Case study: Oroville Dam Spillway Incident (Damfailures.org)]
{{Website Icon}} [https://damfailures.org/case-study/st-francis-dam-california-1928/ Case study: St. Francis Dam Failure (Damfailures.org)]

==[[Best Practices Resources]]==
{{Document Icon}} [[Stability Analysis of Concrete Structures (EM 1110-2-2100) | Stability Analysis of Concrete Structures (EM 1110-2-2100), USACE, 2005]]
{{Document Icon}} [[Gravity Dam Design (EM 1110-2-2200) | Gravity Dam Design (EM 1110-2-2200), USACE, 1995]]
{{Document Icon}} [[Arch Dam Design (EM 1110-2-2201) | Arch Dam Design (EM 1110-2-2201), USACE, 1994]]
{{Document Icon}} [[Design of Small Dams | Design of Small Dams, USBR, 1987]]

==[[Trainings]]==
{{Video Icon}} [[On-Demand Webinar: Introduction to Concrete Gravity Dams]]
{{Video Icon}} [[On-Demand Webinar: Uplift and Drainage for Concrete Dams and Spillways]]
{{Video Icon}} [[On-Demand Webinar: Analysis of Concrete Arch Dams]]
{{Video Icon}} [[On-Demand Webinar: Stability Evaluations of Concrete Dams]]
{{Video Icon}} [[On-Demand Webinar: Roller Compacted Concrete - Design and Construction of Water Control Structures]]


{{Citations}}


{{revhistinf}}