I don't think you can turn it into soil but you can turn it into good compost by turning it and mixing it up. The center will compost but once that part is done it won't work its way out. Have you ever seen a pile of mulch smoking? It's composting, the anaerobic bacteria is breaking down and the molecules are working overtime against each other creating heat. Landfills can catch on fire due to composting because the heat gets so intense. Take a 6' x 6' pile of your shavings. Throw about one third of the cow or chicken manure in, add some water to it, Even get a box of Rid Ex septic tank additive and add it in, Its's the bacteria that compost needs to get working and watch it go. Once it stops smoking, turn it and add more nitrogen material. Even fertilizer with nitrogen will help. If you have a tractor with a front loader to mix it with, do it on a larger scale. You have the makings for some great compost!