Answer / gopi

back Filling:
after completing foundation or any structure,doing that gape filling or extra area
Refilling:
temporary or wrong excavation filled all excavated area

Answer / sjtbehera

Backfilling is done after a structure complete its ground construction. Refilling means cutting then immediate filling but you go without technical both are same meaning.

Answer / sha

The excavated sand filling called back filling..and filling
red earth from out side is called refilling

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