(For anyone just finding this thread, this is about an issue where stargates damage the floor when they are used, destroying the floor blocks under them and thus themselves after a couple uses, as well as killing characters. I play on a dedicated server. The problem happens whether vortex damage is on or off, but is much worse when it is on.)

I confirmed that the Stargate vortex damage was set to off. I don't have the wormhole mod. It behaved exactly as I described before. I also observed that I once took damage by standing near the portal when it opened, which sounds like I "intersected the radius" as you said. Exit ports seem to kill characters in that radius as well, even when they've been open for a bit. It seems that perhaps not only is the vortex damage in effect when it shouldn't be, it's a bit larger than intended, hence the damage to blocks directly below the stargate? This might be supported by the fact that after I turned off vortex damage, the blocks below the stargate were only partly damaged instead of completely destroyed.

Or perhaps I can speculate that as of some update, the game, if not finding a collision mesh for a model, adds one of its own, causing the vortex effect to collide with things?

Anyway, here's a log with debug. I went back and forth between two portals until one of them broke. I went three or four times, welding the armor blocks back into shape the first few times. One of the stargates was on a row of light armor blocks stickng out in the air and it did ALMOST no damage to those blocks. The other one was in a somewhat cramped room on top of heavy armor floor in all directions, with only windows as walls (those don't transfer deformation do they?) and the floor took a LOT of damage each time the gate was opened.
http://www.megafileupload.com/7x4w/Stargate.log