Allowable Bearing Capacity of Shallow Foundations Based on Shear Wave Velocity |
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| Authors: | Semih S Tezcan Ali Keceli Zuhal Ozdemir |
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| Institution: | (1) Bogazici University, Bebek, Istanbul, Turkey;(2) Istanbul University, Beyazit, Istanbul, Turkey;(3) Higher Education Research Foundation, Istanbul, Turkey |
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| Abstract: | Firstly, the historical background is presented for the determination of ultimate bearing capacity of shallow foundations.
The principles of plastic equilibrium used in the classical formulation of the ultimate bearing capacity are reviewed, followed
by a discussion about the sources of approximations inherent in the classical theory. Secondly, based on a variety of case
histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting, an empirical
formulation is proposed for the determination of allowable bearing capacity of shallow foundations. The proposed expression
corroborates consistently with the results of the classical theory and is proven to be reliable and safe, also from the view
point of maximum allowable settlements. It consists of only two soil parameters, namely, the in-situ measured shear wave velocity, and the unit weight. The unit weight may be also determined with sufficient accuracy, by means
of another empirical expression, using the P-wave velocity. It is indicated that once the shear and P-wave velocities are
measured in-situ by an appropriate geophysical survey, the allowable bearing capacity is determined reliably through a single step operation.
Such an approach, is considerably cost and time-saving, in practice. |
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| Keywords: | allowable bearing pressure bearing capacity foundation design shallow footings shear wave |
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