STUDY ON RAPID RESTORATION OF ROADBED SLOPE VIA AIR-FOAM TREATED LIGHTWEIGHT SOIL AND ROOT PILES

Landslide of roadbed slope easily leads to vegetation deterioration and bring a lot of waste soil which cause a series of secondary disasters. Due to the low efficiency and helpless for utilization of the waste soil of traditional methods, this study comes up with a new approach via air-foam treated lightweight soil and root piles to restore the roadbed slope rapidly and to prevent secondary disasters. To obtain fast foundation construction, simple supporting-retaining structure, and quick backfill of roadbed materials, the authors put forward a roadbed slope support system based on the air-foam treated lightweight soil and root piles. Taking root piles made from the fast-setting concrete as the foundation, the study achieves quick backfill, as air-foam treated lightweight soil is light-weighted, mobile and self-compacting with fast construction speed and requiring no permanent supporting structure. In addition, the proposed method has verified through numerical simulation. Suffice it to say, that this research sheds new light on rapid restoration of roadbed slope and achieve the goal of harmony between support technology and environmental protection.