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1 <br />1 <br />1 <br />1 <br />t <br />1 <br />1 <br /> <br />SPENCER'S (1973) -Magnitude & I.ocavon of <br />Inerstice Forces <br />Slice Right Force Interstice Force Boundary <br />Height <br />p x<oord Angle Force Height Height <br />Ratio <br />(ft) (degrees) (Ib) (ft) (ft) <br />1 1495.13 15.40 12900. 7.()9 8.91 <br />.795 <br />2 1548.00 15.40 183057. 21.49 33.56 <br />.(x40 <br />3 1586.48 15.40 521981. 27.82 68.64 <br />.405 <br />4 1569.11 15.40 531101. 27.98 69.36 <br />.403 <br />5 1700.00 15.40 813446. 40.70 110.30 <br />.369 <br />6 1700.10 15.40 813733. 40.71 110.34 <br />.369 <br />7 1990.00 15.40 1547778. 63.27 201.30 <br />.314 <br />8 2066.80 15.40 140(A50. (x6.66 208.02 <br />.320 <br />9 2068.40 15.40 1403032. 66.74 ZO8. I6 <br />.321 <br />10 2070.00 15.40 1400012. 66.83 208.30 <br />.321 <br />11 2298.00 15.40 1057627. 85.93 234.50 <br />.366 <br />12 2299.29 15.40 1064960. 85.69 235.02 <br />.365 <br />13 2299.67 15.40 1058442. 85.82 234.(x7 <br />.366 <br />14 2343.20 15.40 478268. 59.23 158.73 <br />.373 <br />IS 2386.73 15.40 122073. 32.01 82.79 <br />.387 <br />Ib 2398.00 15.40 66356. 28.99 63.13 <br />.459 <br />17 2429.04 .00 -38. .30 .00 .000 <br />AVERAGE VALUES ALONG FAILURE SURFACE <br />Total Normal Svess = 13176.85 (psf) <br />Pore Water Pressure = 175.66 (psf) <br />Shear Svess = 3535.91 (psf) <br />Tonal Lengrh of failure surface = 1155.83 feet <br />For the single specified surface and the assumed angle <br />of the interstice forces, the SPENCER'S (1973) <br />procedure gives a <br />FACTOR OF SAFETY = 1.572 <br />Tonal shear stre~gdt available <br />along specified failure surface = 625.24E+04 Ib <br />