Laserfiche WebLink
JC[sham,PG January 20,2015 <br /> Page 2 of 2 <br /> The yield acceleration (ky) is the average horizontal acceleration value within the critical failure mass that <br /> results in a pseudo-static factor of safety equal to 1.00. Based on Newmark(1965), if the maximum value <br /> of the averaged accelerations induced within the critical stability failure surface exceeds the yield <br /> acceleration value (k,,), the potential exists for permanent displacement along the critical failure surface. <br /> The averaged accelerations induced within the critical slope are often referred to as the seismic <br /> coefficient (kmax) or the maximum horizontal equivalent acceleration (MHEA), both which are often lower <br /> than the estimated PGA value. In other words, if the ground shaking caused by the design event <br /> produces accelerations less than the calculated yield acceleration, seismic slope displacement is very <br /> unlikely. <br /> The results of the seismic displacement analysis yielded a median displacement value of 0.0275 inch and a <br /> 16% probability of exceedance value of 0.6523 inch. Both values are deemed negligible and are less than the <br /> limit of 12 inches recommended by the U.S. Environmental Protection Agency in their 1995 Seismic Design <br /> Guidance for Municipal Solid Waste Landfills. Title 27 California Code of Regulations does not specify an <br /> acceptable value for permanent displacement under seismic loading. <br />