If something happens as usual, it happens in the way that it normally does, especially when other things have changed. When somebody died everything went on as usual, as if it had never happened
Such as is in common use; such as occurs in ordinary practice, or in the ordinary course of events; customary; ordinary; habitual; common
Usual is used to describe what happens or what is done most often in a particular situation. It is a neighborhood beset by all the usual inner-city problems She's smiling her usual friendly smile After lunch there was a little more clearing up to do than usual It is usual to tip waiters, porters, guides and drivers. = normal Usual is also a noun. The stout barman in a bow tie presented himself to take their order. `Good morning, sir. The usual?'
You use as usual to indicate that you are describing something that normally happens or that is normally the case. As usual there will be the local and regional elections on June the twelfth The front pages are, as usual, a mixture of domestic and foreign news
occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure; "grew the usual vegetables"; "the usual summer heat"; "came at the usual time"; "the child's usual bedtime"