单桩沉降计算理论研究

以Geddes应力解为基础，考虑土体的三向应力分布，并根据土的Duncan-Chang本构模型和基础沉降计算的修正分层总和法，建议了单桩沉降计算新理论。该理论与以往基于Geddes应力解计算单桩沉降方法相比，作了如下改进：(1)考虑了地基土的三向应力分布对单桩沉降计算的影响；(2)考虑了土本构模型(Duncan-Chang模型)，因而能计及土体非线性特性对单桩沉降计算的影响；(3)采用修正分层总和法理论，能考虑土体成层分布特性以及侧向变形对单桩沉降计算的影响。因而该单桩沉降计算方法在理论上更趋完善，而且计算量适中，适合工程应用。

STUDY ON SETTLEMENT CALCULATION OF SINGLE PILE

Based on Geddes stress solution and considering 3 dimensional stress of soil,a new theory on settlement calculation of single pile is presented according to Duncan-Chang constitutive model and modified layer summation. Compared with general method based on Geddes stress solution,three improvements are made,that is,(1) adopting Geddes 3D stress solution,its effect on settlement of single pile can been calculated,(2) Duncan-Chang model is used to study the settlement of pile and the nonlinear character is tics of soil can been considered,and (3) using modified layer summation,the layer character is tics and lateral deformation of soil can been computed. Therefore,the proposed method is more perfect in theory,and calculation amount is moderate to practical application.