粘性是液体流层问相对运动而产生的摩擦力或阻力。油层间所产生的运动阻力称为粘性摩擦力。
Viscous friction is the fiction, or resistance to relative motion, between adjacent layers of liquid. The resistance of motion between these oil layers is called viscous friction.
对不同位移模式下水平微分单元进行受力分析，认为位移模式只影响了层间等效内摩擦角。
By the stress analysis of the differential element under different displacement modes, it is supposed that the displacement mode only influences the equivalent internal friction Angle of interlayer.
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