Quick Answer
Your driveway is sinking due to weak subgrade soil, water drainage issues, or poor construction techniques, which can cause settlement and erosion.
Soil Conditions and Subgrade Weakness
Soil conditions play a significant role in driveway stability. If the subgrade soil lacks adequate bearing capacity, it may not support the weight of the driveway or surrounding soil, leading to settlement. Clays and expansive soils are common culprits, shrinking and swelling with moisture changes. To mitigate this, consider a geotextile fabric or a 6-inch layer of compacted aggregate base material under the driveway. This can improve drainage and provide a stable foundation for the driveway.
Water Drainage and Erosion
Water accumulation around the driveway can exacerbate settlement by softening the soil and creating erosion. Proper grading and drainage are essential for preventing water from collecting near the driveway. Ensure the driveway slopes at least 2% to direct water away from the area. Installing a French drain or a swale can also help to redirect water flow and prevent erosion.
Inspecting and Repairing the Driveway
Inspect the driveway for signs of settlement, such as uneven surfaces or cracks. If you notice any issues, consider hiring a professional to assess and repair the driveway. Repairing or replacing the subgrade soil, adding drainage features, or installing a new surface can help stabilize the driveway and prevent further sinking.
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