Simple shear test shows that there is a shear zone in soil nearby the contact surface, in which the shear dilation/compression effect exists during shearing.

• 接触面单剪试验显示，在土与结构接触界面土体一侧存在剪切错动带，剪切过程中的土尤其是粗颗粒土出现明显的剪胀/剪缩效应。