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No .... There will be a small hole and some sand will start falling out of it but it will not become obsolete. And they use multiple layers of sandbags for protection in actual bunker. Damaged sandbags can be replaced within few minutes.

. 50 mm vs sandbag ( check the position of sandbag in actual bunker that is horizontal ) sandbags can provide better protection against even heavy firing 0.50mm vs train track

Sandbags are used all over the world for bunker protection because it is cheaper, easier and much more effective.