基于应变路径法的压入管桩单桩挤土位移

摘要

基于应变路径法和球孔扩张理论，结合真实源与虚拟源、真实源与虚拟汇的相互作用，在假定土体变形为小应变的前提下，将压入实心桩单桩挤土位移的求解方法应用于压入管桩，通过求解真实源与虚拟汇共同作用下产生的竖向挤土位移，并修正地表面处的附加剪应力，得到压入管桩单桩竖向挤土位移的解析解；通过求解真实源与虚拟源共同作用下产生的水平挤土位移，并修正地表面处的附加正应力，得到压入管桩单桩水平挤土位移的解析解。由挤土位移的解析解可知，桩长、管桩内外径和土塞高度最大值的变化都会对压入管桩挤土位移产生影响。%On the basis of strain path method and the spherical cavity expansion theory, the solution of compacting displace⁃ment of press⁃in solid pile is used to solve the compacting displacement of press⁃in pipe pile combining with real source and virtual source or sink under an assumption that soil deformation is small strain. By solving the vertical compacting displacement under real source and virtual sink and revising shear stress in the ground surface, the vertical compacting displacement of press⁃in pipe pile is obtained. By solving the horizontal compacting displacement under real source and virtual source and revising normal stress in the ground surface, the horizontal compacting displacement of press⁃in pipe pile is obtained. The findings of the analysis of compacting displacement indicate that pile length and outside and inside diameters of pipe pile and the maximum height of soil plug may affect the compacting displacement of press⁃in pipe pile.