Study On Technology Of Foundation Treatment At Brdge-head In The Yellow River Alluvial Plain That Base On Settlement And Settlement Rate

The Yellow River alluvial plain is flat,and the soil is deep.Expressways built in this area are mostly filled with embankment,and the filling height is generally higher.This area is rich in silt and silty clay,the groundwater level is high,so the various diseases were easily occurred in this subgrade.The settlement at transition section of bridge is the most common,and have huge harm.In order to reduce the different settlement,and avoid bumping at bridge-head,a reasonable standard for Control different settlement at transition section of bridge was needed,and the appropriate treatment technology of foundation was choosed.However,there is no clear and uniform standard for Control different settlement at transition at present,the commonly treatment technology of foundation can not effectively reduce the settlement which high-fill subgrade caused.Firstly,investigations and analyses were taken to the transition section of bridge of built expressways in this paper,and the settlement and settlement rate were been put forward.Subgrade and foundation model were established by FLAC3D numerical software,the different settlement was calculated when the pavement structure is destroyed,combined with the expressway repair time point,determine the control standard of settlement rate,and based on the double-index control standard for expressway in the Yellow River alluvial plain,evaluate the common treatment technology of foundation.At last,from the indoor model test and numerical simulation analysis,the bearing and drainage characteristics of pervious concrete pile were been studyed,and the influence of pile length and pile spacing on settlement and drainage was analyzed.The results of this article,which can provide a new basis for the selection of the foundation treatment at the Yellow River alluvial plain,avoiding bumping at bridge-head occurred.