The best attempt on a repair would be to pick away any loose bits of particle board that prevent perfect mating, then lightly coat both the chipped pieces and the base with a good quality wood glue and mate them together. Wipe off any excess you see when you mate them together, and clamp down on them using a piece of scrap wood to ensure they would stay in place. If it were me, I'd probably use painters tape to ensure they remain in place before I clamped the wood down. Regarding particle board, it doesn't look any dryer than your typical press-wood furniture; the wood glue will do a good job of forming a good bond.
Like the other post says, you might need to get a little creative with the bolts; my bet given how this looks, you might need to secure the bolts and such with some JB Weld on top of doing the repair, joining both the bolts and whatever flanges that those are secured to.