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[mirrizin]

Maybe if the miner had no way to climb out he'd stay in the hole and finish the job?

Nope. The problem isn't that the miner is *choosing* to climb out of the hole (they climb out as freely as they climb back in, that is, never), it's that channeling under himself causes the miner to fall, a falling dwarf will attempt a wall-grab, a successful wall-grab results in a climbing dwarf, and a climbing dwarf will not path to jobs (they seem to path to a "safe" location, possibly a meeting area or their previous-idle location).

You can work around this issue by using up/down staircases instead of vertical shafts in most cases. Water will flow freely down a staircase, and refuse, minecarts, and even prisoners will fall down as well (prisoners have a fair chance of grabbing the walls, which is true in the case of a single-tile shaft too). You do need one tile of "free fall", so channel out the top of the stairway after it has been dug.

If you absolutely want a vertical shaft, you can dig channels in a 2x1 pattern, alternating which tile on each level. This will prevent the miner from falling, thus forcing him to complete the job just like in the old days. Then a simple cave-in to remove the ramps left will create a 2x1 vertical shaft straight down.

In this instance, it was a garbage chute, so stairs aren't an option.

Looking again, I think what may have made the difference later was that I had to build a wall around it in cavern 1. Once I was past that, the dorfs didn't (couldn't?) climb out anymore.

The incinerator is now operational.

Thanks for the analysis of what goes on, that makes perfect sense.

[Loci]

If you absolutely want a vertical shaft, you can dig channels in a 2x1 pattern, alternating which tile on each level. This will prevent the miner from falling, thus forcing him to complete the job just like in the old days. Then a simple cave-in to remove the ramps left will create a 2x1 vertical shaft straight down.

I'm interested in how to do that exactly.
Edit: Just tried to do this, now the miner lies dead at the bottom of the shaft 

side view:

_V__
##V#
#V##
##V#
#V##
##V#
#V##
##V#

V - channel
# - undesignated wall

Only one channel job is available at a time (so no multi-miner mishaps), each channel job is completed by a dwarf standing *beside* the tile (so no falls/climbing), and each successive channel job "breaks" the ramp on the previous level (so no leaving early). After the tiles are channeled, a simple cave-in will clear out the remaining ramps.

What about a 1x1 stairway, and cave-in from the top to clear the stairs?

Cave-ins don't destroy stairs.

In this instance, it was a garbage chute, so stairs aren't an option.

Refuse falls down stairwells just fine if you channel out the top level. As do minecarts, prisoners, and liquids.

[EBannion]

Loci, that is brilliant.