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BRAY, RATHJE, AUGELLO AND MERRY D Seismic Design for Lined Solid-Waste Landfills <br />222 GEOSYNTHETICS INTERNATIONAL S 1998, VOL. 5, NOS. 1-2 <br />2.7.2 Comparison of Analytical Results to Observed Performance <br />Analytical results presented in the current paper (e.g. Figures 6 and 11) were used to <br />estimate the expected range of earthquake-induced permanent displacements for a <br />number of California landfills that were shaken by the 1989 Loma Prieta and 1994 <br />Northridge earthquakes (Bray and Rathje 1998). The calculations and observations are <br />summarized in Table 1. <br />Table 1. Back-analysis of seismic landfill performance (from Bray and Rathje 1998). <br />Landfill EQ MHA <br />(g) <br />Tm <br />(s) <br />D5-95 <br />(s) <br />Ts <br />(s) <br />ky kmax <br />(³/+1¹) <br />U <br />(mm) <br />Observed <br />damage <br />Buena Vista LP 0.40 0.6 13 0.64 0.261 0.17/0.23 None No <br />cracking1 <br />Guadalupe LP 0.45 0.6 13 0.64 0.201 0.24/0.32 3to40 Minor <br />downslope <br />movement1 <br />Pacheco <br />Pass <br />LP 0.30 0.6 14 0.76 0.301 0.16/0.21 None No <br />cracking1 <br />Marina LP 0.21 0.6 15 0.59 0.261 0.12/0.16 None No <br />cracking1 <br />Zanker Road LP 0.19 0.6 15 0.56 0.141 0.07/0.10 None No <br />cracking1 <br />Lopez <br />Canyon C-A <br />NR 0.42 0.5 11 0.64 0.27 0.18/0.25 None No <br />cracking2 <br />Lopez <br />Canyon C-B <br />NR 0.42 0.5 11 0.45 0.35 0.24/0.33 None No <br />cracking2 <br />Chiquita <br />Canyon C <br />NR 0.33 0.6 11 0.64 0.09 0.18/0.24 30 to 200 240 mm tear in <br />HDPE2 <br />Chiquita <br />Canyon D <br />NR 0.33 0.6 11 0.64 0.10 0.18/0.24 20 to 150 300 mm tear in <br />HDPE2 <br />OII <br />Section HH <br />NR 0.11 0.6 16 0.47 0.14 0.10/0.13 none 50 to 150 mm <br />cover cracks <br />2 <br />OII <br />Section HH <br />3 <br />-- ---- ---- ---- --0.81 0.08 0.13/0.16 20 to 250 50 to 150 mm <br />cover cracks <br />2 <br />Sunshine <br />Canyon <br />NR 0.46 0.5 11 0.77 0.31 0.17/0.23 none 20 to 300 mm <br />cover cracks <br />2 <br />Sunshine <br />Canyon3 <br />-- ---- ---- ---- --1.3 0.25 0.30/0.37 2to50 20 to 300 mm <br />cover cracks <br />2 <br />Notes:1 Observations of damage and ky values are from Buranek and Prasad (1991). <br />2 Observations of <br />damagearefromAugello etal. (1995). <br />3 Analysesperformedforshallowsliding alongthecoversystemusing <br />Figure 12. EQ = earthquake event; NR = Northridge; LP = Loma Prieta.³=median,¹= standard error.