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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Case II - Unusual Loading Condition <br /> <br />o Dead weight of concrete <br />o Horizontal water load for reservoir water surface E1. 8689.8 <br />o Tai1water load E1. 8533.5 (PMF backwater) <br />o Horizontal silt load <br />o Uplift <br /> <br />Case III - Extreme Loading Condition <br /> <br />o Case I loads <br />o Pseudo-static inertia and hydrodynamic loading due to an <br />earthquake acceleration of 0.10 g <br /> <br />Minimum stability factors of safety requirements are as follows: <br /> <br />Sliding Stability - The shear-friction factor of safety designated <br />as SSF and computed by the following equation, shall be greater <br />than 3.0 for usual loading, 2.0 for unusual loading, and 1.0 for <br />extreme loading: <br /> <br />SSF = C A + (V - U) tan 0 <br /> H <br />When: <br />C = Unit cohesion <br />A = Area of section considered <br />V = Summation of vertical forces <br />U = Summation of Uplift forces <br />H = Summation of Horizontal forces <br />tan 0 = Coefficient of internal friction <br /> <br />Values for cohesion and internal friction were assumed to be <br />100 psi and 450 respectively for concrete surfaces. These values <br />were also applicable for the foundation contact plane based on <br />geological assessment of the foundation rock. <br /> <br />3 - 20 <br /> <br />6819W/502OW <br />