For the cellar of a new house a hole is dug in the ground, withvertical sides going down 2.40m. A concrete foundation wallis built all the way across

iohanetc

iohanetc

Answered question

2021-04-19

For the cellar of a new house a hole is dug in the ground, withvertical sides going down 2.40m. A concrete foundation wallis built all the way across the 9.6m width of the excavation. This foundation wall is 0.183m away from the front of the cellarhole. During a rainstorm, drainage from the streetfills up the space in front of the concrete wall, but not thecellar behind the wall. The water does not soak into the clays oil. Find the force the water causes on the foundation wall. For comparison, the weight of the water is given by:
2.40m9.60m0.183m1000kgm39.8ms2=41.3kN

Answer & Explanation

Viktor Wiley

Viktor Wiley

Skilled2021-04-21Added 84 answers

When the hole is dugging in the initial stage the the verticalsides from 0m to 2.40m
So average height is h=0+2.40m2=1.20m
We know the formula for the gauge pressure is
Pgau=ρgh
=(103kgm3)(9.8ms2)(1.20m)
=11.76103Nm2
Now the formula for the force the watercauses on the foundation wall is
F=(Pgau)A
=(11.76103Nm2)(2.40m)(9.60m)
=270.9103N

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