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<br />The horizontal shear stress is given by: <br /> <br />Z <br />Sa = -.318w HAl (81 - k83) <br /> <br />10 <br />Sa = -.318x IlOx25x60 (.174 - .8Sx2.36) <br /> <br />Sa = 267 psf <br /> <br />the submerged weight of foundation <br /> <br />PI = 10' x 60' = 600 psf <br /> <br />and weight of embankment, P2 <br /> <br />5 <br />P2 = .318 x 110 x 2S[ (.174 + .014 + 2.36) + 60 (.174 + .85 x 2.36) <br />10 <br />+ 60 (. 174 - . 85 x 2.36) ] <br /> <br />P = 2199 psf <br />2 <br /> <br />The resisting shear Sr = C + (PI + P2) tan c;il = 400 + 2799 (.488) = 1765 psf <br /> <br />Then factor safety against horizontal movement is <br /> <br />F S = resisting shear = 1765 = 6.6 <br />.. shear force 267 <br /> <br />This high a factor against sliding also indicates the dam has not moved <br />downstream. Downstream movement was one item of concern from the initial <br />inspection. <br /> <br />Longitudinal Cracking <br /> <br />The cracking has been occurring each spring according to a past super- <br />intendent of Water Works for Idaho Springs. He has recalled seeing this type <br />crack since at least 1952. <br /> <br />III-6 <br />