There is no formal way of preventing this behaviour as editing a post is assumed to improve it, and the subsequent bump is a by-product.
Since the site is community driven, improper use of this technique can be discussed in the chat room - to seek confirmation (just to make sure you're not seeing things that aren't there) and perhaps brought to moderator attention. They would be able to super-ping the user (if they're not in the chat room already) requesting a change in behaviour if deemed necessary (with an accompanying explanation of why meaningless edits are not helpful) or perform more rigorous actions.
My (a general) suggestion would be to stagger edits when editing multiple questions rather than lumping them together at one time. Also, avoid deliberately staggering edits to a single question. While this still dilutes the front page, at least it doesn't bombard it and/or bury other active posts.