Study On Subgrade Settlement Of Aeolian Soil And Vibration Isolation Of High-speed Railway

Take Beijing to Shenyang high-speed railway passenger transport line in building through Six Subsidiary area of FuXin city, LiaonNing Province aeolian soil as the research object. Support by "Specialized research fund for the doctoral program of higher education project based on train-rail-subgrade system coupling as dynamic characteristics of aeolian soil subgrade and vibration isolation measures (NO.20112121110004) ", combining the method of laboratory test, theoretical calculation and numerical simulation, to carry out the aeolian soil dynamic response of high speed railway, sedimentation characteristics and vibration isolation measures. Through the indoor test, obtains aeolian soil basic physical and mechanical parameter and dynamic modulus and damping ratio of the most value, analyzed the aeolian soil liquefaction mechanism under vibration load and law of development of super static pore pressure. And through the simulation of train vibration load triaxial test, subsidence forecast of the aeolian soil in different depth; Analysis the problems of high speed railway foundation vibration isolation measures exist, put forward to the CFG-"melamine" in form of case and plate composite foundation structure on the base of sheet pile structure foundation-ground-based systems, according to the construction experience and theoretical calculation, drew up the size of the ground vibration isolation structure as well as the best combination; Application of Midas GTS geotechnical engineering simulation software, study the traffic cyclic loading effects of aeolian soil vibration deformation characteristics, contrast analysis of the three different roadbed structures settlement deformation law of the foundation, and comparing with the results of train load dynamic triaxial test, expounds good vibration isolation effect of CFG-"melamine" in form of case and plate composite foundation; puts forward to concept of span ratio, and do more analysis to "melamine" in form of case and plate of the vibration isolation effect of single factor control variables, elaborated on the premise of meet the requirements of bearing capacity, increasing the thickness of the "melamine" in form of case and plate thickness or diameter ratio can be effectively reduced dynamic stress on transmission to the foundation of the diffusion.