Most proposals for moon colonies are either built underground or covered up with a thick layer of regolith for both of the reasons you mentioned. It’s very likely a collider would also be built underground for the same reasons. Digging a many-miles-long tunnel on the moon with the awful properties of moon regolith to deal with would have its own set of challenges though.
Don’t forget about the heated argument on a bodybuilding forum about how many days are in a week