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Granular Column for Footing Support

A granular column constructed under a footing provides improved beaing stress. Parameters are as follows:

The minimum height of the granular column required to support the footing and to obtain the maximum increase in bearing capacity is 3B.

Maximum Bearing capacity = Kp[YcD + 2(1 + B/L)Cu] Where: Kp = Rankine passive pressure coefficient,(1+sinΦ)/(1-sinΦ) Φ = friction angle of granular material, degrees Yc = moist unit weight of weak clay, kip/ft3 D = depth of the rectangle foundation below ground surface, ft B = width of foundation, ft L = length of foundation, ft Cu = undrained shear strength of weak clay, ksf

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