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267 APPENDIX E-4 Owi Island Site -- Case Study Site Response in the 1985 M 6.2 Chiba-Ibaragi Earthquake General This Appendix presents results of numerical modeling of the response of the Owi Island site in the 1985 M 6.2 Chiba-Ibaragi earthquake. Owi Island was constructed through the hydraulic deposition of sand, silt, and gravel over natural soil layers of clay, silt, and sand.
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268 Table E2. Chiba-Ibaragi Earthquake – Earthquake and Strong Motion Parameters at the Site.
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269 Table E-3 – Summary of Advanced Laboratory Testing Soil RC and TS Sand Y Silt N (MRD Curves Estimated by Ishihara et al., 1987) RC = Resonant Column; TS = Torsional Shear; Y = Available and used herein; N = Not Measured.
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270 (b) Silt Figure E-2.
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271 System Testing Figure E-4 documents the process of system testing (i.e., model testing at the soil profile level)
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272 Results - Ground Surface Response The total stress analysis (TSA) was performed first to establish a Total Stress (TS)
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273 (a) Program 2 (MKZ)
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274 Results - Response within Soil Profile Figure E-7 shows select results of the TSA in a profile view. Input PGA (recorded at approximately 10 m b.g.s.)
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275 presented herein in the form of normalized PWP ratio (ru)
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276 (c) Peak Shear Strain (d)
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278 (a) Program 2 (MKZ)
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279 Figure E-12(a) shows interpretation of site information in terms of "recorded" stress-strain loops.
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280 Figure E-13. Comparison of the Recorded and Calculated Free-Field Ground Surface Motions in the 1985 M 6.2 Chiba-Ibaragi Earthquake.
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281 APPENDIX E-4 Attachment Site Response Model of the Owi Island Site. Layer Soil Type (Modeled as)
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282 Parameters and Coefficients of the LE-MC Model (Program 3) LE-MC Input Parameters Layer No.
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283 Parameters and Coefficients of the PM4SAND Model (Program 3) Layer No.
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284 Parameters and Coefficients of the UCSDSAND3 Model (Program 3) Layer No.
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285 Parameters and Coefficients of the UBCSAND Model (Program 4) Layer No.
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286 Parameters and Coefficients of the PM4SAND Model (Program 4) Layer No.
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