Answer :
a. Excavation of the garage: The excavation of the garage involves excavation work that removes the soil in the area of the garage. The garage has a footprint of 35,000 square feet, and is three levels deep with each level being 10 feet in height.
To calculate the excavation amount required, we must first find the total volume of the excavation.V = L × W × DThe dimensions of the garage are:L = 35,000 sq.ftW = 30 ft (width of the garage)D = 30 ft x 3 levels = 90 ftTherefore, the total excavation volume required is:V = 35,000 x 30 x 90 = 94,500,000 cubic feetb. Slab on Grade: The slab on grade is the base of the garage and will be made of concrete. The slab should be 6 inches thick. The slab dimensions are:L = 35,000 sq.ftW = 30 ftTherefore, the volume of the slab on grade will be:V = L × W × TWhere T is the thickness of the slab = 6 inches = 0.5 feet.V = 35,000 x 30 x 0.5 = 525,000 cubic feetc. Support of excavation (Perimeter of the garage is 900lf):
The support of excavation involves shoring up the walls of the garage to prevent them from collapsing during construction. The perimeter of the garage is 900 linear feet. Therefore, we need to calculate the area of the excavation and multiply it by the height of the walls.Area of excavation = 35,000 sq.ftHeight of walls = 10 x 3 levels = 30 feetPerimeter of excavation = 900 linear feetThe perimeter of the excavation is 900 feet. The depth of the excavation is 30 feet. Therefore the area of the excavation is:Area = 900 x 30 = 27,000 square feetWe need to multiply the area by the height of the walls to get the volume of the excavation.V = Area x Height = 27,000 x 30 = 810,000 cubic feetd. Spread footings (Each is 10' x10' x 3'):
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