There are ASD and LRFD methods, depending on the wall type. I'm sure that you could perform LSD checks on various elements, but I can't recall a coherent LSD approach for the geotechnical side of things.
Prof Mick Pender of Auckland University NZ has run courses with good notes on Limit State design. Try contacting him via the Uni, though I'd heard he was on sabbatical. Still e-mails should be passed on.
Gareth Williams
Geotechnical Engineer,
Auckland New Zealand