>>583534
Dynamite is a loose clay mixed with nitroglycerin, which makes it into a tough dough consistency. Then carefully rolled into a paper tube, and allowed to cure in there. It's more stable than raw nitroglycerin since it can technically be cut, and won't go off if vibrated during transport, but it's not considered one of the "stable" explosives which are used as filler in artillery shells.
The classification of a truly stable explosive is one which can survive the 20-50 thousand g forces being launched out of a rifled cannon barrel. That was tough, in the beginning, when you didn't know if your cannon would explode if triggered.
Measuring holes by radius instead of depth is ridiculous though. A single standardized "stick" of dynamite weighs about 200g, and on normal rain-packed soil will dig a hole from 15-30cm in depth. On loose dry dirt the hole will be slightly more, on packed clay soil its going to be less, and on concrete its going to be nonexistant. 200g of dynamite will not inflict any damage on concrete or asphalt aside from cosmetic scarring and maybe a crack or two, if its a very shitty unreinforced concrete.