what is Cavitation(cavities)?
and what is its effect on engineering structures?
all what i know is
the Cavitation(cavities) mean a big Vacuums in soil that effects on building.
please answer me fast i have only one day to get the answer
Dear Samesh, Goodmorning and Fraternal Greetings!
Thankyou very much for asking the question and my answer is as follows
Where there is a basement, a concrete floor is generally placed on the bottom of the excavation within the confines of the footer and basement walls. As the house is built, all of the weight, or load, is carried by the outside walls and footer. In some areas where there are cavities, that can lead to problems.
Cavities of various sizes tend to develop in the soil overburden where infiltrating surface waters erode the soil by piping and transport it downward through bedrock cracks, or joints, that are themselves widened and enlarged by the dissolving of the rock by the infiltrating water. This creates something like a plumbing system through which the eroded soil overburden is carried.
Other types of sinkholes form slowly by the dissolving of carbonate rock at or very near the surface. They tend to have gently sloping sides, and they seldom pose a hazard by collapsing. Like collapse sinkholes, however, they can pose environmental problems related to pollution, because they provide a point where polluted surface runoff can directly flow into the ground water.
In some karst terranes, collapse sinkholes form when the roof of a cave or cavern collapses. However, most collapse sinkholes seem associated with cavities in the soil overlying the carbonate rock. Some prefer the term cover collapse sinkhole to denote that collapse occurs in cavities in the soil overburden, or cover, rather than in the carbonate bedrock below.
Large buildings (schools, shopping centers, office buildings, etc.) commonly have a detailed engineering design to avoid such potential problems, but private homes are often built with little regard to such problems. Adequate site evaluation prior to building is important; done properly, it can do much to prevent damage to a home from differential settling.
The problem develops when a building foundation lies on cavities. The weight of the building will compact the soil to some extent, and the building will settle. That is normal, and does not pose a problem as long as the building settles uniformly. However, in the areas of larger cavities, the result can be differential settling of the building, which may produce cracks in the walls, foundation, and floor. This may compromise the structural soundness of the bearing walls and, therefore, place the safety of the whole structure in doubt.
Dr. D S Subrahmanyam