桩底灌浆钻孔灌注桩竖向承载性能研究

在桩底灌浆预制桩承载性能的研究基础上，进一步研究桩底灌浆钻孔灌注桩的承载性能．首先，考虑了钻孔灌注桩桩端对灌浆产生的渗流场的影响，并提出了一个近似地确定浆水分界面和灌浆体尺寸的方法．然后，凝结的灌浆体作为桩体的扩展和延伸采用有限元法分析了桩底灌浆钻孔灌注桩的性能．结果表明，桩底灌浆可以有效的提高钻孔灌注桩的承载能力．

Research on behavior of boring pile grouted at bottom under axial load

Based on research on the behavior of precasted pile and grouted at pile bottom, the behavior of boring pile grouted at pile bottom is studied further. Firstly, the influence of pile end on seepage field is considered, and it is presented a method for determining interface of grout liquid and water and dimension of the body filled grout liquid. Then the behavior of boring pile grouted at pile bottom is analyzed by FEM, in that the concentrate grout liquid is regarded as a part of pile body. The results from a calculation sample show that the bearing capacity of pile is increased obviously by grouting at pile bottom. The presented method can simulate the mechanism of increasing bearing capacity of pile with grouting at pile bottom effectively. Finally, some valuable conclusions are derived.