Theoretical Foundation Engineering
Featuring an easy-to-understand format where detailed mathematical treatment is kept to a minimum, this in-depth book provides numerous charts, drawings, and illustrations to illuminate the problems and theory.
TABLE OF CONTENTS Theoretical Foundation Engineering
4.6: GENERAL BEARING CAPACITY EQUATION
4.6 GENERAL BEARING CAPACITY EQUATION
The relationships for estimation of the ultimate bearing capacity presented in Sections 4.3 and 4.5 are for continuous (strip) foundations. They do not give the following:
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The relationships for the ultimate bearing capacity of rectangular foundations ( B=width; L=length)
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The effect of load inclination ? with respect to the vertical (Fig. 4.21)
Figure 4.21: Inclined load on a foundation. -
The effect of the increase of q u due to the increase of the foundation depth D f
For these reasons, a general relationship can be written in the form
where
| ? cs, ? qs, ? ?s | = | shape factors |
| ? ci, ? qi, ? ?i | = | inclination factors |
| ? cd, ? qd, ? ?d, | = | depth factors |
Most of the shape, inclination, and depth factors available in the literature are now empirical and/or semiempirical. The factors are listed in Table 4.4.
| Factor | Relationship | Reference |
|---|---|---|
| Shape | For ?=0 : ? cs=1+0.2 ? qs = 1 ? ?s = 1 For ??10 : ? cs = 1 + 0.2 ? qs = ? ?s = 1+0.1 | Meyerhof (1963) |
| ? cs = 1+ [Note: Use Eq. (4.65) for N c and Eq. (4.64) for N q as given in Table 4.3] ? qs = 1+ |
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