The Swell Factor of a rock is a critical consideration when calculating the volume of material after blasting because blasting increases the volume of the rock. The Swell Factor accounts for this increase, allowing for accurate estimation of the amount of material that needs to be handled. Swell Factor is the ratio of the volume of a material after excavation (e.g., blasting) to its volume in situ (before excavation). Blasting introduces air voids between the fragmented rock pieces, increasing the overall volume. It is a percentage. The swell factor is typically expressed as a percentage or a ratio. For example, a swell factor of 25% means that the blasted rock will occupy 25% more volume than it did in its original state. How it affects volume calculations is based on the original and final states. If you know the in-situ volume of rock before blasting, you can use the s....
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