Research On The Variable Stiffness Treatment Technology And Design Method Of High Fill Embankment

With the fast development of China's freeway and railway constructions in recent years, both construction investment and scale are unceasingly expanding. Along with highway constructions gradually outspreading, there are more and more high-fill embankments in the mid and west area of China. Compared with normal road embankment, high-fill road embankment owns large height, wide fill area, and large quantities of conditions. Then request embankment itself has enough strength and stability, and control of total settlement and sedimentation rate, if cannot meet the demands, will seriously affect traffic safety and transportation speed.For freeway high-fill embankment in soft soil area, excess pore pressure is created during the fill process, because of the small permeability coefficient, excess pore water pressure dissipate slowly, so as the additional effective soil stress. Then influence the stability of roadbed deformation. The variable stiffness processing technology for high-fill road embankment, which has post treat period using non-sand concrete micro-pile, can speed up drainage ratio and cementing and vertical displacement. The technology can be used in the road embankment of saturated soft soil, silt clay, clay, plain fill, miscellaneous fill.Based on summarizing the existing high-fill embankment processing method and calculation theory, variable stiffness treatment technology of Embankment treatment is studied:The mechanism of high-fill embankment variable stiffness technology is studied, and convinced that non-sand pile treatment can dissipate the excess pore pressure creating during the fill process. By using FEM to study the mechanism for high-fill Embankment post treatment, the variation of the excess pore pressure, embankment settlement and deformation with the processing of the fill are calculated and analyzed.The variable stiffness high-fill Embankment work performance is studied by numerical simulation, different processing conditions are calculated. The key conditions of the embankment settlement, displacement, and the stress distribution regularity of cement-jetted pile and non-sand concrete micro-pile are analyzed.The technology of variable stiffness processing parameters is analyzed, and the applicability, deformation under different treatment is studied. The embankment behavior is simulated by changing the pile length, pile body modulus, pile spacing. The research concentrates on embankment displacement, pile stress and excess pore pressure, etc.Based on the researches of composite foundation nowadays, probing into the variable stiffness high-fill road design and calculation method of processing technology, and the key parameters are discussed.Combined with site measurement data, this paper analyzes the treatment effect of variable stiffness high-fill Embankment post-treatment technology; the research provides data for the mechanism studies.According to the current research, some advises are discussed for the further research of variable stiffness post-processing high-fill Embankment technology.