The construction of the core of an earth dam requires 320,000 cubic yards (yd3) of clay. The core should be compacted to at least 93% of its standard Proctor maximum dry unit weight obtained in the lab, which was associated with a moist unit weight of 136.8 pcf at a moisture content of 14%. You are the client's engineer in charge of selecting the contractor. Bids from two contractors (A and B) have been submitted. Either contractor will exceed the stipulated minimum dry unit weight by 2% to ensure passing quality control. The contractors plan to procure the required soil from two different sites, as quoted below. Calculate the total cost (haulage and placement) of the bids to verify the contractors' calculations. Company A Distance from borrow pit to embankment: 28 miles Cost of haul ($/yd3-mile): 0.55 Cost of fill material ($/yd3): 2.00 Borrow soil moisture content: 13% Specific gravity of solids: 2.70 Degree of saturation: 70% Company B Distance from borrow pit to embankment: 35 miles Cost of haul ($/yd3-mile): 0.45 Cost of fill material ($/yd3): 2.40 Borrow soil moisture content: 12% Specific gravity of solids: 2.71 Degree of saturation: 60% The total cost (haulage and placement) for company A (million $) The total cost (haulage and placement) for company B (million $)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The construction of the core of an earth dam requires 320,000 cubic yards (yd3) of clay. The core should be compacted to at least 93% of its standard Proctor maximum dry unit weight obtained in the lab, which was associated with a moist unit weight of 136.8 pcf at a moisture content of 14%. You are the client's engineer in charge of selecting the contractor. Bids from two contractors (A and B) have been submitted. Either contractor will exceed the stipulated minimum dry unit weight by 2% to ensure passing quality control. The contractors plan to procure the required soil from two different sites, as quoted below. Calculate the total cost (haulage and placement) of the bids to verify the contractors' calculations. Company A Distance from borrow pit to embankment: 28 miles Cost of haul ($/yd3-mile): 0.55 Cost of fill material ($/yd3): 2.00 Borrow soil moisture content: 13% Specific gravity of solids: 2.70 Degree of saturation: 70% Company B Distance from borrow pit to embankment: 35 miles Cost of haul ($/yd3-mile): 0.45 Cost of fill material ($/yd3): 2.40 Borrow soil moisture content: 12% Specific gravity of solids: 2.71 Degree of saturation: 60% The total cost (haulage and placement) for company A (million $) The total cost (haulage and placement) for company B (million $)

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