中文摘要：

桩的下刺变形是桩网复合地基沉降来源之一,其特性是高速铁路地基处理研究的重要内容。本文从理论上分析了桩网复合地基桩端下刺机理,运用有限元软件ABAQUS对影响桩端下刺量的各种因素进行了计算分析,发现影响桩端下刺量的主要因素是路堤填土变形模量,桩径、加固区土体变形模量,桩端土体变形模量、黏聚力、内摩擦角和桩顶荷载。在此基础上运用MATLAB自带的数理统计工具箱对影响桩端下刺量的主要因素进行了参数回归分析,并给出一种桩端下刺量的计算公式。

英文摘要：

The pile end puncture deformation is one of the settlement sources of pile-net composite foundation.The research on pile end puncture deformation characteristics is important for foundation treatments of high speed railway.The mechanism of pile end puncture in pile-net composite foundation was theoretically analyzed.Using finite element software ABAQUS,various factors influencing the pile end puncture were analyzed.The result shows that the main influencing factors include deformation modulus,pile diameter,reinforced area soil deformation modulus of subgrade filling,deformation modulus,cohesion and internal friction angle,and pile top load of pile end soil.By using the mathematical statistics toolbox of MATLAB to perform factors regression analysis,a calculation formula for pile end puncture value was finally acquired.