I think you will find that if you loose those bolts and nuts in the first picture you can change the angle, rotate the cutting edge up so that the rounded back part rubs with the front edge off the ground, like the skid shoes do on other blades.
That's the way mine was, the bolts on mine were rusted on and broke when I took it apart, I found that the holes were not round but slots so it can be adjusted.
I take it your trying not to plow the gravel just the snow on the driveway. I have a gravel driveway too.
Hope this helps.