Dry dirt will never compact. The friction between the particles will not let the air out.
On the other hand flooded dirt or clay is hard to compact. While it does not have air in the mix it has water. But once the water drains compaction can happen. Clay will compact better than dirt because of all the small particles to fill the tiny voids. The problem with using dirt or clay under a slab is the organic matter in the mix. This will cause it to settle as the organic matter rots away. If you can get some clay dirt mix; most likely red driveway clay; from a pit that is digging well below any organic matter that would be best.
Nothing (in my mind) compacts better than crusher run; 1 inch rocks to dust; limestone. A small dozer can not rip it up.
Sand never fully compacts. Think of a beach. But once you flood compact it that is it. It will not settle more. This and the fact it has little to no organic matter makes it a good cheap fill.
I would clean any disturbed soil out the hole and fill it with sand. Flood it and let drain. Flood it again and let drain. Once you got the hole filled cover the dirt sand with a fabric and put down a layer of limestone.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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