Lec 04 Slope stabilitycontents.kocw.net/KOCW/document/2014/hanyang/parkduhee1/... · 2016-09-09 ·...
Transcript of Lec 04 Slope stabilitycontents.kocw.net/KOCW/document/2014/hanyang/parkduhee1/... · 2016-09-09 ·...
CIE3032 지반공학및실험 lecture 04 slope stability 31
Swedish circle
Used for homogeneous clay soil with = 0Applicable only for short-term analysis of clay slopes (Undrained)Calculated from moment∑ = ∑ 1 1 2 2
∑∑ ∑
Have to find center of circle /failure surface that results in lowest FS by trial and error
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Swedish circle
Stability number(안정정수)Fellenius (1927)Taylor (1937)
dcH
dcH Stability factor
(안정계수)Terzaghi and Peck (1967)
한계상태에서의 비배수전단강도와 단위중량 – 사면고의 관계
CIE3032 지반공학및실험 lecture 04 slope stability 33
Swedish circle
Used for homogeneous clay soil with = 0Applicable only for short-term analysis of clay slopes (Undrained)Calculated from moment equilibrium ∑ ∑∑ = ∑ 1 1 2 2
∑∑ ∑
Have to find center of circle /failure surface that results in lowest FS by trial and error
CIE3032 지반공학및실험 lecture 04 slope stability 34
Swedish circle
∑ ∑
FS = , Stability number(안정정수)Fellenius (1927)Taylor (1937)
dcH
dcH Stability factor
(안정계수)Terzaghi and Peck (1967)
한계상태에서의 비배수전단강도와 단위중량 – 사면고의 관계(Note at failure, cd = su)
CIE3032 지반공학및실험 lecture 04 slope stability 35
Swedish circle
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Swedish circle
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Swedish circle
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Swedish circle
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Ordinary method of slices
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3. Simplified Bishop’s method
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cos i iW P U
Simplified Bishop Method
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Effect of water table
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Comparison of slope stability methods
MethodForce-equilibrium Moment
Equilibriumx yOrdinary method of slices(OMS)Bishop’s simplifiedJanbu’s simplifiedCorps of EngineersLowe & KarafiathJanbu’s generalizedBishop’s rigorousSpencer’sSama’sMorgenstern-Price
NoYesYesYesYesYesYesYesYesYes
NoNoYesYesYesYesYesYesYesYes
Yes YesNoNoNoNoYes YesYesYes
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Swedish circle - Example
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