The average American car weighs nearly 3 thousand pounds; add in the weight of concrete and your driveway soil is potentially keeping 10 thousand pounds of weight afloat. However, when the soil begins to compress, the concrete will follow suit and compress as well.
How can this issue be fixed? Consider PolyLevel Injection Foam. The polymer consists of two liquids that when blended together, create a foam that expands to effectively lift settled concrete.