Laserfiche WebLink
TABLE7 <br /> SEISMIC INDUCED PERMANENT DISPLACEMENT EVALUATION-COVER <br /> BENCH SLOPE <br /> FORWARD LANDFILL <br /> PROCEDURE USED-Bray and Rathje(1998)and Bray et al (1998) <br /> INPUT DATA: <br /> SITE CONDITION-ALLUVIUM <br /> FILL HEIGHT,H, feet 40' <br /> SHEAR WAVE VELOCITY,VS,ft/sec 600 (from Bray, et al.,(1998), Figure 3) <br /> EARTHQUAKE MAGNITUDE for the MCE: 6.7(on the Great Valley 7—20 miles away) <br /> MAXIMUM HORIZONTAL SITE ACCELERATION,kmax 0.15g (mean value for the <br /> MCE for the Site) <br /> SIGNIFICANT DURATION—D5_95 —15 Sec. (for the MPE, <br /> Bray et al, 1998) <br /> YIELD ACCELERATION,ky 0.349(see Appendix C) <br /> CALCULATION: <br /> MEAN PERIOD OF SHAKING, for the MCE: Tm =0.54 Sec. (Bray et al ,1998) <br /> FILL HEIGHT,H, feet 40 <br /> PREDOMINANT FILL PERIOD,TS,sec 0.27 <br /> (TS=4H/VS) <br /> RATIO TS/Tm = 0.50 <br /> RATIO MHEA/MHA x NRF= 1.41 <br /> (from Bray and Rathje(1998),Figure 8b) <br /> Where- MHEA-Maximum Horizontal Equivalent Acceleration of the fill=kmax <br /> MHA -Maximum Horizontal Site Acceleration <br /> NRF -Nonlinear Response Factor= 1.3 (Bray&Rathje, 1998,Figure 6b). <br /> Thus,calculate: <br /> FILL HEIGHT,H, feet 40' <br /> MHEA(or kmax): 0.27 <br /> Multiply by 1.25 to account for 2D effects: 0.34 <br /> Ratio of ky/kmax = 1.00 <br /> Calculate Displacement,U, from Figure 13 of Bray and Rathje(1998): _ <br /> FILL HEIGHT, H, feet 40' <br /> DISPLACEMENT,U,inches: 0 (since k,_ <br />