振杆密实处理可液化地基的加固机理与效果研究OA

The vibratory rod compaction method is an emerging technique for improving liquefiable ground.A numerical model of a ground improved by the vibratory rod compaction method was developed using the coupled arbitrary Lagrangian-Eulerian technique with Abaqus.The variations of surface vibration velocity,soil stress,and plastic strain evolution during the process of the vibrating rod penetrating into the ground were analyzed.Therefore,the mechanism of the method was revealed.Through on-site testing of the ground im-provement of the Dongtai-Xinghua Expressway extension project,the improvement effect was analyzed.The results indicate that,during vibratory rod penetration,the surface vibration velocity decreases and tends to a certain value gradually with the increasing of penetration depth.Both vertical and horizontal soil stresses of surrounding soils increase during the vibratory rod penetration process,and the increasing of horizontal stress and the influence zone is more significant than that of vertical stresses.The equivalent plastic strain decreases with distance increasing from the vibratory rod and it becomes negligible beyond 2 m from the center of vibra-tion point,indicating an effective improvement radius range from 1.0 m to 1.5 m.Field standard penetration tests and cone penetration tests confirm that the vibratory rod compaction method effectively eliminates lique-faction of ground.