Going underground, breaking bad, soil health

I've a very free draining garden on chalk. I discovered our apple tree buried a good foot. While digging about I found a buried concrete path, and loads of litter. Anyway, probably rather foolishly I've been pulling all this out and turning the soil. Barely a worm in sight. And the soil is turning to dust. I've probably killed off anything that was living in the soil, and degraded it, while I had the plan to augment it!
It's only a 3x3m section, and I'm planning to dig in some compost into the top layer and cover with mulch. How long will it take to recover the soil health do you think?
I did have some turf around the tree at one point, but had read that grass around a tree isn't the best of ideas. But perhaps that is only relevant for young trees, or restricted rootstocks. The tree does quite well despite all the abuse it gets.
It's only a 3x3m section, and I'm planning to dig in some compost into the top layer and cover with mulch. How long will it take to recover the soil health do you think?
I did have some turf around the tree at one point, but had read that grass around a tree isn't the best of ideas. But perhaps that is only relevant for young trees, or restricted rootstocks. The tree does quite well despite all the abuse it gets.
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Lots of old metal waste, glass, a few batteries and loads of plastic. They probably weren't harming it. Our back garden appears to have been something of a rubbish dump. This was the second pass over that section. So actually all in all, I've probably pulled a good few carrier bags of waste from there. And it is probably something of a foolish endeavour trying to clean up the garden like this. When I could be growing myself some dinner.
Is grading my own top soil with rotted compost not as good as bringing some in? It feels counter-intuitive to import top soil (from an environmental standpoint).
I now what its like I inherited an allotment last year and I think the guy before me had used it to dump all his household waste on it, like you loads of old carrier bags, cans, glass, plastic, even an old wheel.
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
You need to build the 'dead' ecology. Manure is helpful but ideally you want to encourage a wide variety of fungi and invertebrates to build up the soil bacteria. So I'd go for a mixture of rotted manure, composted bark, leaf mould if you can get/make it. And mulch rather than dig, to let the structure become established. If it fruits, ideally leave as many of the apples as you can bear to on the ground (or just under the surface) to rot down. You'll get plenty of wasps and probably rodents though, so treat that one with caution, depending on where your garden is and where the tree is relative to your house.
It's a Good Thing to have got the rubbish out and removed the concrete which will have been inhibiting the movement of water and animals within the soil. Now you need to try to build an ecosystem around the tree. It doesn't take very long.