用什么土料做基础工程的回填士，建筑施工图上一般都不做规定，只需做到回填达到规定的密实度即可。南方地区，由于雨水较多，工地多没有土方夯实机械，人工夯实强度大，难于保证土方回填的密实度，因而多采用浸水毛砂回填。尤其是深基坑回填土。尽管采用毛砂做回填土价格偏高 What kind of soil material will be used as a backfill for the basic project will not be stipulated in the construction drawings. It is only necessary to backfill and achieve the specified degree of compactness. In the southern region, due to more rainwater, there is no more earth-moving equipment on the construction site, and the artificial compaction intensity is large, and it is difficult to ensure the compactness of the earth backfill. Therefore, backfilling with water-sanded sand is often used. Especially for deep excavation backfill. Although using wool sand as backfill, the price is high