Cave ins

Setblock clock:
/setblock ~ ~-1 ~ redstone_block
/setblock ~ ~1 ~ air

Detection (for mining stone):
/scoreboard objectives add Cavein stat.mineBlock.minecraft.stone
/testfor @a[score_Cavein_min=1]
*RESET* /scoreboard players set @a Mine 0

Cave in (must go in order)
1: *ACTIVATION* /fill ~8 ~ ~ ~1 ~ ~ redstone_block 0
2: /scoreboard objectives add CaveIn dummy
3: execute @a ~ ~ ~ fill ~3 ~3 ~5 ~-5 ~10 ~-3 double_plant 0 replace stone
4: /scoreboard players set @e[type=Item] CaveIn 1 {Item:{id:minecraft:double_plant}}
5: /execute @e[score_CaveIn=1] ~ ~ ~ summon FallingSand ~ ~1 ~ {Block:stone,Time:1,DropItem:false,HurtEntities:true,FallHurtAmount:20}
6: /execute @e[type=FallingSand] ~ ~ ~ setblock ~ ~1 ~ stone 0 destroy
7: /scoreboard objectives remove CaveIn
8: /execute @a ~ ~ ~ playsound random.explode @a ~ ~ ~ 2 1
9: *RESET* /fill ~-8 ~ ~ ~-1 ~ ~ air 0