pertemuan 05 daya dukung tanah
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Pertemuan 05 Daya Dukung Tanah. Matakuliah: S2094 / Rekayasa Pondasi Tahun: 2005 Versi: 1.1. Shallow Foundations Bearing Capacity. The problems of soil mechanics can be divided into two principal groups - stability problems and elasticity problems - Karl Terzaghi, 1943. - PowerPoint PPT PresentationTRANSCRIPT
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MatakuliahMatakuliah : S2094 / Rekayasa Pondasi: S2094 / Rekayasa PondasiTahunTahun : 2005: 2005VersiVersi : 1.1: 1.1
Pertemuan 05Pertemuan 05Daya Dukung TanahDaya Dukung Tanah
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Shallow Foundations Shallow Foundations Bearing CapacityBearing Capacity
• The problems of soil mechanics can The problems of soil mechanics can be divided into two principal groups - be divided into two principal groups - stability problemsstability problems and and elasticity elasticity problemsproblems
- Karl Terzaghi, 1943- Karl Terzaghi, 1943
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Karl Terzaghi (1883-1963)Karl Terzaghi (1883-1963)
• Father of modern soil mechanicsFather of modern soil mechanics• Born in Prague, CzechoslovakiaBorn in Prague, Czechoslovakia• Wrote “Wrote “ErdbaumechanickErdbaumechanick” in 1925” in 1925• Taught at MIT (1925-1929)Taught at MIT (1925-1929)• Taught at Harvard (1938 and after)Taught at Harvard (1938 and after)
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Karl Terzaghi at Harvard, Karl Terzaghi at Harvard, 19401940
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Bearing Capacity FailureBearing Capacity Failure;; Fargo Grain Elevator, N. DakotaFargo Grain Elevator, N. Dakota
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Transcosna Grain Elevator, CanadaTranscosna Grain Elevator, CanadaOct. 18, 1913Oct. 18, 1913
West side of foundation sank 24-ft
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Stability ProblemStability ProblemBearing Capacity FailureBearing Capacity Failure
• Bearing Capacity AnalysisBearing Capacity Analysis• How do we estimate the How do we estimate the maximum maximum
bearing pressurebearing pressure that the soil can that the soil can withstand before failure occurs?withstand before failure occurs?
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Bearing Capacity FailuresBearing Capacity Failures
Types/Modes of FailureTypes/Modes of Failure general shear failuregeneral shear failure local shear failurelocal shear failure punching shear failurepunching shear failure
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General Shear FailureGeneral Shear Failure
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Punching Shear FailurePunching Shear Failure
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Model Tests by Vesic (1973)Model Tests by Vesic (1973)
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General GuidelinesGeneral Guidelines
Footings in clays - Footings in clays - general sheargeneral shear Footings in Dense sands ( > 67%)Footings in Dense sands ( > 67%)
--general sheargeneral shear Footings in Loose to Medium dense Footings in Loose to Medium dense
(30%< < 67%) - (30%< < 67%) - Local ShearLocal Shear Footings in Very Loose Sand ( < 30%)-Footings in Very Loose Sand ( < 30%)-
punching shearpunching shear
rD
rD
rD
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Bearing Capacity FormulasBearing Capacity Formulas
zDucult sNq
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Terzaghi Bearing Capacity Terzaghi Bearing Capacity FormulasFormulas
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Terzaghi Bearing Capacity Terzaghi Bearing Capacity FormulasFormulas
BNNNcq qzDcult 5.0
For Square foundations:
For Continuous foundations:
BNNNcq qzDcult 4.03.1
For Circular foundations:
BNNNcq qzDcult 3.03.1
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Bearing Capacity FactorsBearing Capacity Factors
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Terzaghi Bearing Capacity Terzaghi Bearing Capacity FormulasFormulas
D D B B No sliding between footing and soilNo sliding between footing and soil soil: a homogeneous semi-infinite soil: a homogeneous semi-infinite
massmass general shear failuregeneral shear failure footing is very rigid compared to soilfooting is very rigid compared to soil