This example considers a strip footing design in sand using SPT $(N)$ values, for the no groundwater case. Find the allowable bearing capacity of the strip foundation shown in the Fig. $5\mathrm{.}18.$ Sand was encountered $10)$ below the footing and SPT $(N)$ values are as shown.

Figure s$.$I$6$ strip rooting in sand

Determine the appropriate bearing capacity versus penetration equation to use, i$.$e$.$ either the lower limit equation proposed by Terzaghi and Peck in the latter $1940\text{'}$s or the upper limit equation later modified by Peck Calculate the appropriate bearing capacity value to assign the strip footing above in pounds per square feet $($psf$)..$

In addition to the above information, the following conditions are to be considered:

The percentage of gravel and cobbles in the deposit

The depth and width ratios of the footing

The amount of silt and clay in the deposit

The possibility of rise of the water table

The possibility of the development of a perched water condition