Site Grading of Terrace

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Presentation transcript:

Site Grading of Terrace http://www.restreets.org/case-studies/portland-green-street-program Norman W. Garrick CE 4410 Spring 2017 Lecture 7

Terrace slopes 3/% down to top Side slopes in cut: 3:1 max 110 109.5 Terrace: 4 m by 5 m Terrace slopes 3/% down to top Side slopes in cut: 3:1 max 107.0 107.5 108.0 108.1 108.1 108.5 109.0 4 m 109.5

110 109.5 107.0 107.5 107.8 107.8 108.0 108.1 108.1 108.5 109.0 4 m 109.5

Contour 108.5 is 1.2 m from Point A 110 109.5 Contour 108.5 is 1.2 m from Point A 107.0 107.5 107.8 107.8 108.0 A 108.1 108.1 108.5 109.0 4 m 109.5

Contour 109 is 2.7 m from Point A 110 109.5 Contour 109 is 2.7 m from Point A 107.0 107.5 107.8 107.8 108.0 A 108.1 108.1 108.5 109.0 4 m 109.5

Contour 108 crosses the terrace 110 109.5 Contour 108 crosses the terrace 107.0 107.5 107.8 107.8 108.0 A 108.1 108.5 109.0 4 m 109.5

Contour 109.5 is 4.2 m from Point A 110 109.5 Contour 109.5 is 4.2 m from Point A 107.0 107.5 107.8 107.8 108.0 A 108.1 108.1 108.5 109.0 4 m 109.5

Same relationship for Point B 110 109.5 Same relationship for Point B 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m 109.5

110 109.5 Repeat for C and D 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m 109.5

110 109.5 Draw Contour 108 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m 109.5

110 109.5 Draw Contour 108.5 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m 109.5

110 109.5 Draw Contour 109 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m

110 109.5 107.0 107.5 108.0 108.5 109.0 Draw Contour 109.5 107.8 107.8 A B 108.1 108.1 4 m

Complete Grading Plan 4 m 110 109.5 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m

110 109.5 Any Design Issues? 107.0 107.5 107.8 107.8 108.0 A B 108.1 108.1 108.5 109.0 4 m

Creating a Diversion X X X 4 m 110 109.5 107.0 107.2 107.5 107.8 107.8 108.0 A 108.1 108.1 107.7 107.7 X X X 107.9 108.5 109.0 4 m 109.5

Complete the 108 ft Contour 110 109.5 Complete the 108 ft Contour 107.0 107.2 107.5 107.8 107.8 108.0 A 108.1 108.1 107.7 107.7 X X X 107.9 108.5 109.0 4 m 109.5

110 109.5 108 Ft Contour Lines 107.0 107.2 107.5 107.8 107.8 108.0 A 108.1 108.1 107.7 107.7 X X X 107.9 108.5 109.0 4 m 109.5

Complete Grading with Diversion 110 109.5 Complete Grading with Diversion 107.0 107.2 107.5 107.8 107.8 108.0 A 108.1 108.1 107.7 107.7 X X X 107.9 108.5 109.0 4 m 109.5

Calculation of Cut and Fill

110 109.5 107.0 107.5 108.0 108.5 109.0 106.5

110 109.5 107.0 107.5 108.0 108.5 109.0 106.5 A B

Profile A - B Proposed Existing A B

110 109.5 107.0 107.5 108.0 108.5 109.0 106.5 Limits of Cut and Fill

How do we Calculation Cut and Fill? We look at three methods: Average End Area Method Contour Area Method Borrow Pit Method

Average End Area Method Typically used for linear projects such as roads, railroads, canals http://www.latinamericanstudies.org/erie-canal.htm

Find area of Fill and Cut separately for selected cross-sections Volume of Fill (or cut) between Two Cross-sections = [(A1 + A2)/2 ] * L Where: A1 is area of fill for Cross-section 1 A2 is area of fill for Cross-section 2 L is distance between 1 and 2

A refinement to this approach is used when A1 or A2 is an end cross-section (there is not fill or cut) In this case, (A1+A2)/2 * L Over estimates the volume since The shape of the earthwork is more Like a pyramid. In this case a more accurate formula Is [(A1+A2)/3] * L (Note there is an error in text for this formula)