Will weed membrane prevent raspberry plants spreading ?

You'd be better off burying something to the sides of the plants to provide a channel for the suckers/roots to grow along, maybe wood like decking boards.  Not sure how deep you'd need to go.  Membrane will just get pushed up I reckon.  I've found potatoes left in the ground and covered in membrane will just lift it up when they grow, and raspberries are much stronger/woodier so would expect them to do the same.