Research On The Tecnology Of Backfilling Bridge Backwall Subgrade By Rapid Impact Compactor

Today in the highway retailing backwall subgrade filling,especially the filling of special foundation and narrow area,the traditional compaction technology and construction technology can not making the degree of compaction to meet the standard requirements.The rapid impact compactor was invented based on this situation.It can effectively avoid the large post-construction settlement and the not enough overall degree of compaction.This technique makes up the technology gap between the surface compaction,vibration compaction and dynamic compaction.So this paper analyzes the mechanism and characteristics of the rapid compaction method,and preliminary analysis of the mechanism and differential settlement control of the bridge head jump,lay the theoretical foundation of the numerical simulation,the selection of the parameters of the field construction,and the effect analysis.By using ANSYS software to simulate different working conditions,according to different impact energy and impact number,different hammer weight,hammer diameter and other factors,to analysis effective impact depth and safe distance,and the arrangement of the impact points.Simulation analysis on the effect of rapid impact compaction on the highway retailing backwall subgrade filling.Combined with the actual data by on site measurement of Tianjin-Tangshan highway job location,according to the special geological conditions of Tianjin area,a set of construction control parameters and construction technology is put forward to improve the construction quality control technology of bridge foundation in Tianjin area.At the same time,combined with the actual situation in Tianjin area,compare the software simulation and the actual situation,to provide valuable suggestions to the site operation,and also for further research.