Improvement on the Key Element of Flexible U-Shaped Steel Support and Its Field Applications

Figure 10

The relationship between surface stress and slippage magnitude of lock units under high confining pressure. (a)Top surface of two-slotted splint lock unit, (b)bottom surface of two-slotted splint lock unit, (c)top surface snap-in lock unit, (d)bottom surface snap-in lock unit.

(a)

(b)

(c)

(d)