回填施工应均匀对称进行,并分层办实,分层厚度≤250mm,夯实后回填土压实系数应≥0.94。施工时应注意不得损伤防水层。改写这段话查重率低于20%

The backfill construction should be carried out evenly and symmetrically, and compacted in layers. The thickness of each layer should not exceed 250mm, and the compaction coefficient of the backfilled soil after tamping should be ≥0.94. During construction, care should be taken not to damage the waterproof layer. The rewritten paragraph has a plagiarism rate of less than 20%.