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Pertemuan 05 Daya Dukung Tanah

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.

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Pertemuan 05 Daya Dukung Tanah

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  1. Pertemuan 05Daya Dukung Tanah Matakuliah : S2094 / Rekayasa Pondasi Tahun : 2005 Versi : 1.1

  2. Shallow Foundations Bearing Capacity • The problems of soil mechanics can be divided into two principal groups - stability problems and elasticity problems - Karl Terzaghi, 1943

  3. Karl Terzaghi (1883-1963) • Father of modern soil mechanics • Born in Prague, Czechoslovakia • Wrote “Erdbaumechanick” in 1925 • Taught at MIT (1925-1929) • Taught at Harvard (1938 and after)

  4. Karl Terzaghi at Harvard, 1940

  5. Bearing Capacity Failure;Fargo Grain Elevator, N. Dakota

  6. Transcosna Grain Elevator, CanadaOct. 18, 1913 West side of foundation sank 24-ft

  7. Stability ProblemBearing Capacity Failure • Bearing Capacity Analysis • How do we estimate the maximum bearing pressure that the soil can withstand before failure occurs?

  8. Bearing Capacity Failures Types/Modes of Failure • general shear failure • local shear failure • punching shear failure

  9. General Shear Failure

  10. Punching Shear Failure

  11. Model Tests by Vesic (1973)

  12. General Guidelines • Footings in clays - general shear • Footings in Dense sands ( > 67%) -general shear • Footings in Loose to Medium dense (30%< < 67%) - Local Shear • Footings in Very Loose Sand ( < 30%)- punching shear

  13. Bearing Capacity Formulas

  14. Terzaghi Bearing Capacity Formulas

  15. Terzaghi Bearing Capacity Formulas For Continuous foundations: For Square foundations: For Circular foundations:

  16. Bearing Capacity Factors

  17. Terzaghi Bearing Capacity Formulas • D  B • No sliding between footing and soil • soil: a homogeneous semi-infinite mass • general shear failure • footing is very rigid compared to soil

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