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Canadian Foundation Engineering Manual 2006 Pdf Viewer

08.09.2019 
  1. Coastal Engineering Manual

Bearing Capacity equatinos - accounting for fill

Civil engineering manual

Then plot to the PDF plotter. Get AutoCAD 2007. It has a PDF plotter built in. Then plot to it. BTW, this topic has been beat to death. Search the discussion group for more info. Brad wrote in message news:5150879@discussion.autodesk.com. Hi There, Does anybody know how to save dwg file to PDF file in AutoCAD 2006?

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  • Miscellaneous, Soils and Foundations Reference Manual - Volume I, 2006, FHWA-NHI-06-088, View PDF (10 mb). Scanning Tours, Geotechnical Engineering Practices in Canada and Europe - International Technology Exchange Program, 1999, FHWA-PL-99-013. Miscellaneous, Manual.
  • The Canadian Foundation Engineering Manual covers fundamental matters common to all aspects of foundation engineering, such as notation, definitions of terms and symbols and the classification of soil and rock. It also covers procedures used in subsurface exploration, a discussion of unusual site.

Coastal Engineering Manual

Bearing Capacity equatinos - accounting for fill

Hi,
I'm hoping some of you can help untangle some confusion on bearing capacity. An ongoing argument in our office says the depth of fill should be conservatively discounted in determining ultimate bearing capacity, by setting the gamma*Df term as zero. However no one can say why, or quote a source.
Let's assume we're using a general BC equation (from Canadian Foundation Engineering Manual Ed.4):
qu = cuNcSc + qsNqSq + 1/2*gamma*B*Ngamma*Sgamma
The S-terms are shape factors for strip or rectangular footings. If I understand correctly, the CuNc term is shear resistance along the log-spiral shear surface, qsNq term is the resistance to upwards displacement of the volume within the log-spiral surface due to surcharge above the footing depth, and the 1/2*gamma*B*Ngamma term is the wedge below footing. I assume the wedge below footing is unaffected by the fill, so if correct, have no questions about the 1/2*gamma*B*Ngamma term.
My argument against discounting the gamma*Df term is that the surcharge provided by the depth of fill helps to resist failure along the log-spiral surface extending outside the footing area. Therefore I believe the gamma*Df term can be kept as non-zero.
Also, various textbook diagrams show the footing installed below final grade, with either (i) the log-spiral failure surface (cuNc term) extending to the ground surface (i.e. through the fill in this case, which also contributes to surcharge); or (ii) extending out only as far as to match the bearing depth elevation, and discounting shear within the fill. In Terzaghi's equation, where Nc=(Nq-1)*cot(phi), does the Nc value account for shear within the material above the footing, or does tihs really make much difference? If the fill depth should be discounted, then why?
Does Cu or Nc change depending on whether the material is new fill or native material that's been in place for several thousand years? The only way I can see a difference being made is with fine grained soils, where effective stress takes time to develop under the fill surcharge, increasing Cu. However for coarse grained soils, increases in effective stress should develop quickly after fill placement, so the fill can only help - correct??
Other issues are:
- what influence does fill depth have on gross vs. net ultimate bearing capacity? (i.e. fill adds to gamma*Df term providing resistance to upwards displacement of failure volume, yet reduces the amount of 'additional' structural load that can be placed on the bearing surface - confusing!)
- serviceability may be affected by ongoing consolidation settlements if fill is relatively new, reducing the serviceability limit state
Cheers!
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