Abstract:Aiming at the difficulty of backfilling behind culvert abutment on the desert expressway, combined with the characteristics of the engineering environment in the rich aeolian sand of desert area, the key technology of backfilling behind the aeolian abutment is studied. The best compaction method and the rolling processes of backfilling behind the aeolian sand abutment are evaluated by testing the influence of two rolling processes under the hydraulic sprinkling and compaction method of one static press of road roller + one vibration press and one static press of the bulldozer + one finish of the scraper on the compaction degree behind the aeolian sand abutment, and the influence of two rolling processes of non-rolling by water sinking method or one static press by loader on the compaction degree behind the aeolian sand abutment. The stability behind the aeolian sand abutment is evaluated by using the overloading method to preload the section behind the abutment and to observe its settlement value. The study result shows that compared with the water sinking method, the watering rolling method only needs to wet the surface aeolian sand. Its water consumption is less than one tenth of that of water sinking method, and its economic benefits are remarkable. Compared with the rolling process of the bulldozer static press once + the scraper truck receiving the light once, the method of one static press of road roller + one vibration press is low in mechanical resource demands. Moreover, it can meet the needs of continuous operation and the construction efficiency is remarkable. In addition, the stability of backfilling behind the Aeolian sand abutment by this method is good, and the differential settlement risk behind the abutment is reduced. At the same time, the water damage can be greatly avoided because of the Aeolian sand material with the good water permeability.
