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In case of releasing artesian pressure, which precaution should be taken when the system of well points is adopted.

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In case of releasing artesian pressure, which precaution should be taken when the system of well points is adopted.

(a) Pumping rate

(b) Air locks

(c) Duplication of pumps

(d) Blowing action

I have been asked this question in homework.

My question is based upon Deep Excavations topic in chapter Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Correct answer is (d) Blowing action

To explain I would say: Blowing action is adopted for the release of artesian pressure. At some places, the artesian conditions exists at a certain death from the ground level. If the foundation trench reaches that depth, its bottom is likely to be blown off due to hydrostatic pressure.

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