Research on the Subgrade Settlement Site Testing and Theoretical Calculation of High-speed Railway
|Keywords||CFG pile—Column pile hammer expansion composite foundation Settlement Cushion effect Composite modulus method Chord modulus method|
CFG pile composite foundation has got a wide range of promotion in the high speedrailway of the loess area, meanwhile embankment settlement requirements in the high speedrailway is more strict than ordinary railway, but the related theoretical research is not enoughperfect, which brings more problems for the control of the high speed railway postconstruction settlement foundation. This paper which is dependent on the built Zheng-Xipassenger line and the building Da-Xi passenger line studied the control technique of highspeed railway subgrade settlement. Research work is reflected in the following aspects:Bury pressure box, meter, flexible displacement meter, single point displacement meter,copper components in the test section of the high-speed railway construction project,collectrelevant data, and analysis the earth pressure and settlement,the stress of CFG pile andcompression deformation, besides the changes of the geogrid on embankment deformation.In addition, it can find three regression subsidence forecast results are reliable by forecastingthe post construction settlement of the test section using the hyperbolic method, three pointsand Asaoka method, three kinds of regression analysis method.It can find that several settlement calculation methods get consistent settlement of changerule, sedimentation values by using chord modulus method are close to the measured valuesand revised composite modulus method can well reflect the settlement of roadbed, which isdrawn by settlement calculation using stratified summation method, the composite modulusmethod, chord modulus method and comparation with the measured values.It can find the calculated subsidence value is very close to the measured value, bycalculating high-speed railway subgrade settlement using2d-sigma analysising software,according to the characteristics of composite foundation settlement. Then it can find thelateral impact can generally spread lateral double roadbed width in the embankment slope bystudying the lateral impact load under the action of embankment settlement, through thecalculation choosing embankment on both sides extends to twice the roadbed width as theanalysis domain for numerical analysis.