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<br />44 <br /> <br />Condition Three: The surcharge or height of water above ground level (h) is greater <br />than seventy-five percent of the total depth of soil and water loading H (see <br />Figl.Jte 6.3). <br /> <br />D' <br /> <br />= <br /> <br />GROUND EL. <br /> <br /> <br />H <br /> <br />TOTAL DEPTH OF WATER <br />AND SOIL LOADING <br /> <br />h <br /> <br />o <br /> <br />o. <br /> <br />\ /Ii,\\' <br /> <br />a <br /> <br />:; <br /> <br />~..-;~.,' <br /> <br />.:.~. 'c-.-!> ;.:" .6,: <br /> <br />Figure 6,3, Combination soil/water loading, <br /> <br />All three conditions assume that height of surcharge, h, is measured from the water surface <br />to the ground surface (see Figure 6,3) and the total loading height H does not exceed the <br />height of the basement wall or eight feet. For condition one, it is assumed that the water sur- <br />face elevation and ground elevation are equal (figure 6.4), For condition two, the soil pre- <br />ssure is compensated for by multiplying the specific weight of water by a factor of 1.15 to <br />obtain the equivalent fluid weight. For the third condition, the soil pressure becomes neglig- <br />ible and the specific weight of water is used for the equivalent fluid weight. <br /> <br />For condition two and three, the resultant horizontal force is calculated as shown in Figure <br />6,1 except that for condition two, yw is increased by a factor of 1.15. For condition one, <br />where the ground elevation is assumed equal to the water surface elevation, the equivalent <br />weight is calculated using the Rankine analysis for soil pressure. <br /> <br />o' <br /> <br />~ . <br /> <br />'C> <br /> <br />" <br /> <br />o <br /> <br />a=H <br /> <br />F .1. l <br />H - 2 l) eq . <br /> <br />'. <br /> <br />, p ';,) <br /> <br />/j '.~' <br /> <br />.:. . '~'c, <br /> <br />I. <br /> <br />J <br /> <br />PH = LATERAL PRESSURE AT BOTTOM = 1 eq , a <br />Fillure 6.4, Soil/water force diallram, <br />