桩底压浆桩在轴向荷载作用下的有限元分析

简述了桩底压浆桩的成桩工艺，讨论了其提高承载力的机理，建立了桩－土体系分析模型，利用所提出的分析模型对桩底压浆桩成桩及压桩的全过程进行了模拟分析。在分析中引用了非线性接触面单元、考虑了土体的非线性。结果表明桩底压浆桩的荷载－沉降曲线为“缓变型”，与普通灌注桩荷载－沉降曲线显著不同；桩底压浆桩的承载力较之普通灌注桩有显著提高；土体性质、压浆压力和压浆腔高度对桩底压浆桩提高承载力的效果有显著影响。

Analysis of base-grouted pile under axial load

Briefs the construction of base-grouted pile,discusses the improvement of bearing capacity of base-grouted pile.Presents the analysis model built with nonlinear interface elements and nonlinear soil elements to simulate the construction and loading of base-grouted pile and concludes that the load-settlement curve of base-grouted pile is progressive,and remarkably different from that of bored pile.The bearing capacity of base-grouted pile can be significantly improved in comparison with that of bored pile;character of soil,size of grouting cavity and pressure of grouting have considerable ef-fect on the bearing capacity improvement of base-grouted pile.