Dynamic and Static Analysis of the Effect of Cement Fly-ash Gravel Pile on Bridgehead Bumping Treating
In order to study the improvement effect of cement fly-ash gravel pile(CFG pile)on bridgehead bumping treating,based on the actual project,the model test method was used to analyze the influence of CFG pile length,pile diameter and pile spacing on the pavement settlement at the bridge head and vertical shear stress of pile and soil under dynamic and static loads.According to the composite modulus method,the improvement effect of CFG pile on the phenomenon of bridgehead bumping is verified.The research results show that with the increase of CFG pile length,pile diameter and the decrease of pile spacing,the pavement settlement at the bridge head decreases gradually,which can improve the phenomenon of bridgehead bumping.With the increase of vehicle travel time,the pavement vertical displacement and the vertical shear stress of the pile top at the bridge head after the reinforcement of CFG piles with different pile lengths and pile diameters increase first and then decrease and finally tend to be stable.After the vehicle passes through the bridge head,the pavement has a small upward uplift.After four years of service,the pavement maximum settlement at the bridge head tends to be stable after CFG piles reinforcement with different pile lengths and pile diameters.When the CFG pile is used to treat the bad soil at the bridge head,the CFG pile length should be 12～16m,the pile diameter should be 450～500mm,and the pile spacing should be 1.6～1.8m.
万方数据
维普
