Why Does Concrete Settle?
Concrete settles for multiple reasons, including poor drainage, bad site conditions, low-quality compaction, tree roots, and more. The most common reason is when rainwater and water from your gutters washes away the dirt from under your sidewalk or driveway. This forms pockets or voids under the existing concrete, which causes it to settle.
Another reason is when you have clay-rich soil, which expands and shrinks as per its moisture level. When the soil is saturated with water, it expands. Then, when the soil dries, it contracts. Thus, the soil remains unstable and causes the concrete to move and sink.
Concrete Leveling Using Polyjacking