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,l <br />FOUNDATIONS AND RETAINING V~'.4LLS <br />10-17 <br /> <br />Figure l0.li A Uniform Surcharge <br />Figure 20.15 Failure 1d~edge <br />Figure 10.16 Sloped Backfill <br />25 SIJRCHARGE LOADING <br />.9. liNIFORttf SUP.CHARGE <br />If there is a uniform surcharge load of q Ibf/ft` above <br />the backfill. there till be an additions! active reaction. <br />Ro. Ro acts at H/2 above the bare. This reaction is <br />in addition to the regular active reaction which acts at <br />H/3. <br />Rq = kAgH x wall width 10.66 <br />m = ~ 10.6 i <br />n = ~ 10.68 <br /> <br />V <br />Ph = 1.77 m=n= (m > 0.9) ]0.69 <br />' <br />H- (m2+n~)3 <br />0.?5h' <br />Ph= n' m < 0.4 <br />( - ) ]0.70 <br />fly .0.16+n=)~ <br />C. LINE LOAD <br />For a line load of q ]bf/ft, the distribution of pressure <br />B. POINT LOAD behind the wall is given by equations 10.71 and 10.72. <br />If a point load is applied a distance z back from the Figure 10.18 applies if V is replaced with q. <br />wall face, as in figure 1D.18. the distribution of pres- <br />sure behind the wall can be found from equations 10.67 q q m'n <br />through 10.70.'9 Vh r H ((m=+ n~)~) ('r` > 0.9) 1D.71 <br />]B These equations are based on elastic theories with a Poisson's ~ q 0.203n <br />racio of µ = 0.5. The coefficients have been adjusted Lo bring ]lh = ~ ~ (m < 0.9) 10.72 <br />the theory into agreement with observed values. H (0.16 + n ) <br />PROFESSIONAL PUBLICATIONS INC. • P.O. Boa 199. San Carlos. CA 94070 <br />Figure 10.18 A Yoint Load Distribution <br />R,t = Rh +/Rv \l 10.69 <br />0 = arctan \ R ~ / = a 10.65 <br />