Friday, November 23, 2012

Housel's (1929) Method of Determining Safe Bearing Pressure from Settlement Consideration - Foundations.

The method suggested by Housel for determining the safe bearing pressure on settlement
consideration is based on the following formula

where Q = load applied on a given plate, Ap = contact area of plate, Pp = perimeter of plate, m = a constant corresponding to the bearing pressure, n - another constant corresponding to perimeter shear.

Objective

To determine the load Qf and the size of a foundation for a permissible settlement Sf.

Housel suggests two plate load tests with plates of different sizes, say Bl x B1 and B2 x B2 for this purpose.

Procedure

1. Two plate load tests are to be conducted at the foundation level of the prototype as per the procedure explained earlier.

2. Draw the load-settlement curves for each of the plate load tests.

3. Select the permissible settlement S,. for the foundation.

4. Determine the loads Q{ and Q2 from each of the curves for the given permissible settlement Sf.

Now we may write the following equations

for plate load test 1 .