Helical piers (aka helical piles, screw piles and ground anchors) are screwed into the soil, instead of being buried or rammed in like concrete piers. Think of helical piers the way you compare ...

· For the Screw dislocation, the Burgers vector and the Line vector are parallel. · A straight screw dislocation creates a helical configuration for the planes normal to the dislocation line. The ...