Earthwork backfilling(1) Requirement for backfilling soilThe backfilling soil shall meet design requirements to ensure backfilling quality.(2) Water content of backfilling soilThe water content of backfilling soil is directly connected with its compactness. Prior to tamping (rolling compaction), test must be conducted to determine optimum water content and minimum tamping (rolling compaction) times according to requirement of compactness.(3) Backfilling method1) In principle, backfilling is performed from bottom to top, with each layer compacted successively. Small handcart will be employed where foundations in foundation pit are dense and make machinery difficult to operate. In areas with open space and less obstructions, dump truck will be used to transport soil and bulldozer to spread, with the thickness of each uncompacted layer being 300 mm. Finally, the backfilling soil will be compacted with vibratory rolling machine, and those at certain areas are tamped with tamper. The corners near foundation will be tamped by hand.2) Upon completion of backfilling, quality inspection shall be made for each layer of the compacted backfilling soil.
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