Crushed by wall, mine shaft radius protecting?

[Bowshot125]

I was run down by a cave-in, even though that angle was covered by the radius? Is this intentional or what? I'd like to know this for the future.

[loftar]

The radius of mine supports is relevant for the tiles that you mine out that might cause a cave-in; once one is triggered, it may very well spread inside the effective area of a mine support.

[Bowshot125]

The radius of mine supports is relevant for the tiles that you mine out that might cause a cave-in; once one is triggered, it may very well spread inside the effective area of a mine support.

No, I mean half the tile that I mined out was protected, why did it cave in?

[loftar]

No, I mean half the tile that I mined out was protected, why did it cave in?

It's very unclear from your picture which tile it was that actually caved in.

However, just covering part of a tile with a mine-support is not a guarantee for it not caving in. To be sure, it should cover the whole tile.