A sinkhole develops when surface soil collapses or sinks into a new or pre-existing hole in the bedrock below. Sinkholes that form slowly through dissolution of the limestone bedrock may be noticeable when the soil begins to subside. In the case of a sudden bedrock roof collapse, the formation of the sinkhole may be quick without forewarning. If a sinkhole forms on your property, you can fill it yourself or ask a soil professional to assist you if the area is large. Does this Spark an idea?
Instructions
1. Fill the bottom half to two-thirds of the sinkhole with limestone gravel or blocks. The rock will provide stability to the lower portion of the hole.
2. Place a 1- to 2-foot layer of clay or clayey sand on top of the limestone. The clay will form a semi-confining layer that will help prevent rainwater from eroding the hole and making it larger.
3. Pour sand on top of the clay later until you are within 6 to 12 inches of the land surface. The sand provides a good base for the top soil and grass or pavement cover.
4. Fill the remaining hole with top soil and complete with grass seed, sod or pavement as desired. If you plan to repave over the area, consult a structural engineer to determine if hole is large enough to require compaction prior to paving.
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