Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines (2024) / Chapter Skim
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Pages 44-60

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From page 44...
... 44 6.1 General The field and experimental programs completed as part of this project were developed primarily to address data gaps within the best soil liquefaction case history available -- the WLA site. The WLA site was shaken by two earthquakes in 1987 (the first one did not liquefy the site; the second one did, but some of the PWP records are the subject of controversy)
From page 45...
... Field and Experimental Programs 45   report, select information is presented in Figures 6-1 and 6-2, which are reduced-size versions of Figures 2 and 10, respectively, from Appendix B-1. Select26 locations of past and current geotechnical instrumentation, current investigations, and past and current interpretations of site conditions are included in the profile.
From page 46...
... 46 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines was simulated in a centrifuge experiment) is provided in Figure 6-2.
From page 47...
... Notes: T.D. = total depth; GLA = Geo-Logic Associates, Inc.
From page 48...
... 48 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines • Lower fine-grained stratum (Unit C)
From page 49...
... Notes: T.D. = total depth; AMSL = above mean sea level.
From page 50...
... 50 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines (a)
From page 51...
... Field and Experimental Programs 51   critical layer of the WLA site in the 1987 Elmore Ranch earthquake and for the critical layer of the Owi Island site in the 1985 Chiba-Ibaragi earthquake. These evaluations are provided in Appendices E-2 and E-4, respectively.
From page 52...
... 52 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines the laminar box presented in Figure 6-6. It includes a layer of fat clay28 with a thickness of about 3.1 m underlain by a layer of silty sand with a thickness of about 3.9 m.
From page 53...
... Field and Experimental Programs 53   As presented in Table 6-2, consistent with the spectral plots in Figure 6-7(a) , the best agreement between recorded and target histories, as expressed in terms of spectral ordinates, PGA values, and AI values, is for the Elmore Ranch acceleration history.
From page 54...
... 54 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines 6.3.2 Advanced Laboratory Testing 6.3.2.1 General The most significant of these data gaps is a lack of results of undrained laboratory testing of the WLA site silty sand. Results of this type of advanced laboratory testing are required for proper calibration of advanced CMs.
From page 55...
... Field and Experimental Programs 55   (a)
From page 56...
... 56 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines is shown in Figure 6-8(b)
From page 57...
... Field and Experimental Programs 57   Remolded specimens from WLA site Unit A (clay) and Unit B (silty sand)
From page 58...
... 58 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines An attempt to generate modulus reduction and damping curves from the results of the undrained strain-controlled CyDSS testing performed on remolded samples of the WLA site silty sand (see Figures 6-11 and 6-12, and Appendix C-3) is presented in Figure 6-13.
From page 59...
... Field and Experimental Programs 59   6.4 WLA Site – Comparison of Field and Physical Modeling Data The secondary goal of the centrifuge modeling program was to replicate the 1987 WLA site case history (two records) in a laminar box.
From page 60...
... 60 Seismic Site Response Analysis with Pore Water Pressure Generation: Guidelines A relatively poor agreement between comparable ground surface responses (i.e., acceleration response spectra) is shown in Figure 6-15 for the second of the 1987 events (M 6.6 Superstition Hills earthquake)

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