Study On Settlement Mechanism And Controlling Technology Of Composite Foundation On Shallow Bedrock Of Wuhan-guangzhou Passenger Dedicated Line

With the rapid development of our country’s high-speed railway,especially without a frantic jumble track technology application,railway roadbed in guarantee strength satisfy the standard requirement at the same time,how to control and reduce the roadbed post-construction settlement high speed railway roadbed design as one of the key problems.Using high strength of composite foundation can effectively reduce the work of subgrade settlement and improve foundation stiffness,however practice indicates that the mechanical properties of the composite foundation and not into full play,and its design calculation theory is still exist deficiencies.The engineering properties of shallow bedrock will affect the bearing mechanism of CFG pile composite foundation at the same time.Based on wuhan-guangzhou railway in foundation treatment CFG pile composite foundation of the field test results,numerical simulation and the field measured in its settlement calculation method and control technology research,perfect CFG pile composite foundation of perfect design theory and practical application.The thesis combines wuhan-guangzhou railway subgrade treatment engineering,aim at the shallow bedrock section of soft soil composite foundation by using the engineering measurement result analysis pile settlement change rule,through the numerical simulation analysis,and discussed the static load embankment-the interaction of pile and soil,the different parameters under the pile of embankment-the interaction law,focus on pile top to the bottom of the pile settlement,the settlement in Hollywood and add in the process of the distribution and the law of development.Based on the static load of settlement of composite foundation analysis results,roadbed of post-construction settlement mechanism and the influencing factors,and analysis considered the pile body elastic modulus,cushion layer thickness,pile diameter,the pile modulus,cloth pile forms and grille the influence of such factors as characteristics,to determine the size of control settlement main factors.In the above on the basis of analysis,by establishing dynamic loading conditions of numerical model,some soft soil dam and composite foundation in traffic load deformation characteristics,analyzes get traffic load embankment surface subsidence and roadbed subsidence of the additional long term power characteristics,the corresponding control technical measures for the engineering decision programming provides the reliable theory basis.