Combined type compacting method for earthwork backfilling of double-arch culvert

The invention discloses a combined type compacting method for earthwork backfilling of a double-arch culvert. The double-arch culvert comprises a culvert structure body; and culvert two-side backfilling areas are located on the two sides of the culvert structure body, and an inter-culvert backfilling area is located in the middle of the culvert structure body. The combined type compacting method comprises the steps that (1) the culvert two-side backfilling areas are backfilled and compacted to the top of the culvert structure body layer by layer; and (2) the inter-culvert backfilling area is backfilled layer by layer, for each layer, compacting is conducted through a hydraulic vibration tamper firstly, then surface-finishing rolling is conducted through a hand-propelled tamper and not stopped until the surface is flat and compact, and after the compaction degree is detected as being qualified, laying construction of the next layer is conducted. Deep layer vibration compacting is conducted through the hydrauli