Critter dug gravel out from under the barn’s cement slab

gravel

I live in the country and have a pole barn with a cement floor.
A critter of some sort has dug a burrow in the dirt under the outside of the barn and pulled out a couple of wheel barrows full of the gravel that supports the concrete floor. The entrance he dug out under the slab is at ground level and only about 12 inches wide.
I am sure the critter is gone now but I have no idea of how to get all that gravel back under the concrete slab.
I don't have any equipment like a backhoe, dozer, bobcat etc. Only hand emplements.
Any suggestions will be greatly appreciated.
Thanks.
Trent.

Best Answer

Mix up a wet slurry of cement, sand and gravel and pour it in, then make some a little less wet and pack it in.