Time Tunnel? :)
Naw, I don't think so. I remember the series, saw it as a teen when it originally aired (and acquired the paperback novels based on it), and that's the wrong shape for their "rings".
I am looking forward to seeing what this does become, given the forum it's posted to. My own guess is a crashed "saucer" of some kind, whether human or alien (cf. C-57-D from
Forbidden Planet), though, partially "buried like that, it definitely fits the description of a Stargate.