剪胀角是用来表示材料在剪切过程中体积变化率的一个物理量。剪切过程中产生的位移分为法向位移和切向位移，剪胀角的正切值为法向位移同切向位移的比值。 剪胀角的定义
结果显示，当上覆压力较小时，剪胀角对抗拔应力的影响较小。
Parametric analysis is carried out to investigate the effects of soil dilation and overburden pressure on the soil nail pullout resistance.
主裂缝的总体传播方向与断层平面的夹角约等于土体在土层平均围压下的剪胀角。
The propagation angle of the principal fault rupture through soil equals the dilation angle of the soil under the mean confining pressure.
给出了塑性区中平均体积应变及弹、塑性变形体积的计算公式和剪胀角的测试方法。
The expressions of elastic deforming volume and plastic deforming volume in the plastic zone were presented together with the average plastic volumetric strain.
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