计算地基中附加应力，必须先知道基础底面处单位面积土体所受到的压力，即基底压力，又称接触压力，它是指上部结构荷载和基础自重通过基础传递，在基础底面处施加于地基上的单位面积压力。反向施加于基础底面上的压力称为基底反力。
本文用有限元法计算了基底压力的变化对地基刚度的影响。
The effect of variation of base pressure upon foundation stiffness are calculated by means of finite element methods.
在此基础上，提出了沉入式无底圆筒结构基底压力的计算方法。
Base on the experimental study, a method for calculating the base stress of the opened bottom cylinder structure is.
利用文克尔局部弹性地基模型，求解均布荷载作用下一端固定的弹性地基梁的基底压力；
With Winkler foundation model, the foundation pressure on Winkler foundation-beam with one fixed end and subject to evenly distributed loading is calculated.
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