Our 3D BEM(Boundary Element Method) calculation shows that the larger the notch width is, the bigger the error makes for the dimensionless stress intensity factor.

At the same rate of soil loss, the maximum settlement value induced under the rotated condition is smaller than that under the normal condition, but the settlement trough width is larger.

The paper also research on the relation between width and velocity, current, pulse width, and summarize the formulae between width and other parameters.