Seepage and Slope Stability HO9

Seepage and Slope Stability HO9 - CE 563, Seepage &...

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Unformatted text preview: CE 563, Seepage & Slope Stability Handout #09 EXAMPLE: Calculation of UPLIFT Forces due to Seepage Distance (m) HEAD (meters) 2 Total* Elevation* Pressure Pore Pressure (kPa) 22.75 EPL No 15.6 7.15 Force, ∆F (kN) 70.14 3 1.7 22.00 15.6 6.40 62.78 113.0 4 4.8 21.25 15.6 5.65 55.43 283.7 5 4.2 20.50 15.6 4.90 48.07 217.3 6 4.6 19.75 15.6 4.15 40.71 204.2 7 3.7 19.00 15.6 3.40 33.35 137.0 8 3.0 18.25 15.6 2.65 26.00 89.0 22.0 Total = 1044.3 *Based on Datum at level of Impervious Layer 8.0 2 7.0 3 4 Pressure Head (m) 6.0 5 5.0 6 4.0 7 8 3.0 2.0 1.0 0.0 0.0 22.0 Distance along base of dam (m) Page 1 of 4 CE 563, Seepage & Slope Stability Handout #09 EM 1110-2-1901 30 Sep 86 a. Construct flow net assuming an impermeable foundation. b. External equipotential lines into foundation without adjusting lines of net in dam. c. Adjust flow net until balanced. Figure 4-13. Flow net construction for embankment on a foundation of lower permeability (courtesy of John Wiley and Sons155) 4-19 Page 2 of 4 CE 563, Seepage & Slope Stability Handout #09 EM 1110-2-1901 30 Sep 86 a. Construct flow net assuming impermeable embankment b. Extend equipotentials up into dam locating initial position of line of seepage c. Adjust flow net to meet basic flow net requirements. Flow net construction for an embankment on a foundation 155 ) of higher permeability (courtesy of John Wiley and Sons Figure 4-14. 4-20 Page 3 of 4 CE 563, Seepage & Slope Stability Handout #09 Page 4 of 4 ...
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