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REVIEW - EARTH WORK Fall 2011

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STEPS FOR EARTH WORK COMPUTATION Define Typical Cross Section Apply Typical Cross Section: Every Station Station at pluses (ground breaks) PT and PC Where profile change from cut to fill or vise versa Compute Area for each Cross Section Compute Volumes between Cross Section

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Typical Cross Section Harbin (1998) Figure 20.2

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Application of Typical Cross Section Wright and Dixon (2004) Fig 13-5

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Application of Typical Cross Section Sections at Pluses Harbin (1998) Figure 20.3

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Application of Typical Cross Section Harbin (1998) Figure 20.4 Transition

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Excavation & Grading Handbook (http://www.electrical- contractor.net/The_Store/CR/Exc&Grading_Hbk_Previ ew.htm)http://www.electrical- contractor.net/The_Store/CR/Exc&Grading_Hbk_Previ ew.htm Side Slope

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Plotting Cross Sections Harbin (1998) Figure 20.6

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Computing Areas for Cross Sections McCormack (1985) Figure 13-3

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Computing Areas for Cross Sections McCormack (1985) Figure 13-3

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Computing Volumes Average-End-Area Where, V = volume (cu yd) A = area end sections (ft 3 ) L = distance between end sections (ft) Where, V = volume (m 3 ) A = area end sections (m 2 ) L = distance between end sections (m) U.S. Units Metric Note: 1 yd 3 = 27 ft 3

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Computing Volume - Example Determine the earthwork volume between Stations 100 and 101 using the average area method if the road width is 30 ft. The cut side slopes are 2 : 1. StationLeftCenterRight 100+00C8.0 31.0 C6.0 0.0 C5.0 25.0 101+00C6.0 27.0 C4.0 0.0 C2.0 19.0

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Computing Volume - Example Determine the earthwork volume between Stations 100 and 101 using the average area method if the road width is 30 ft. The cut side slopes are 2 : 1. Cross Section at 100+00

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Computing Volume - Example Determine the earthwork volume between Stations 100 and 101 using the average area method if the road width is 30 ft. The cut side slopes are 2 : 1. Area at Station 100+00

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Computing Volume - Example Determine the earthwork volume between Stations 100 and 101 using the average area method if the road width is 30 ft. The cut side slopes are 2 : 1. Area at Station 101+00 Volume between 100+00 and 101+00

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