3 edition of State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences found in the catalog.
|Statement||National Academies Press|
|Publishers||National Academies Press|
|The Physical Object|
|Pagination||xvi, 60 p. :|
|Number of Pages||69|
nodata File Size: 7MB.
1 Introduction An earthquake on the morning of February 9, 1971, produced a landslide in the upstream face of Lower San Fernando Dam also known as the Lower Van Norman Daman earthen structure located at the terminus of the Los Angeles Aqueduct see Figure 1. 52 Site Characterization for Case History Assessments, 53 Liquefaction Triggering Case Histories, 58 Site-Specific Ground Motion Recordings, 69 Lateral Spreading Case Histories, 70 Post-Liquefaction Shear Strength Case Histories, 73 Nontraditional Sources of Data, 75 Enhancing Database Development, 75 4 THE SIMPLIFIED STRESS-BASED APPROACH TO TRIGGERING ASSESSMENT.
Many lives could have been lost had the water level in the reservoir been at maximum allowable pool level Cortright, 1975 or the slide a bit larger Page et al. MARK HARRISON, University of California, Los Angeles ANN S. The committee also requested written clarification on specific issues from individual members of the technical community.
Although the task requires the study committee to evaluate objectively the various assessment methods i. The review comments and draft manuscript remain confidential to protect the integrity of the deliberative process.
The figure offers a simplistic description of the liquefaction phenomenon and should not be interpreted to suggest that the density of the soil always increases after a soil liquefies. Publication Info 350 pages 6 x 9 Paperback ISBN: 978-0-309-44027-1 DOI: Copyright Information The National Academies Press and the Transportation Research Board have partnered with Copyright Clearance Center to offer a variety of options for reusing our content.
15,000 modern single family homes, such as shown in bwere damaged beyond repair and abandoned. In the original simplified method, the CRR was evaluated from the standard penetration test SPT blow count of the soil, while subsequent variants of this method sometimes employ other indices of the in situ soil resistance, including cone penetration test or CPT resistance and shear wave velocity or Vs.
Since then, liquefaction assessment in current engineering practice has been inconsistent. 2 Recent Liquefaction in New Zealand In addition to the 15,000 single family homes that had to be abandoned due primarily to liquefaction associated with the February 22, 2011 M 6. Liquefaction was only identified in hindsight and therefore not extensively studied. Recovery following earthquake-induced soil liquefaction can be expensive tens of millions to billions of dollars and may take many years.
Liquefaction is often described in the literature as the phenomena of seismic generation of excess porewater pressures and consequent softening of granular soils. Brief biographies of the committee members are given in Appendix A. 5 earthquake, for cases where there is no initial static shear stress on the horizontal plane or 2 effective overburden pressure of 96 kPa I.1985; Gu et al.
2 Recent Liquefaction in New Zealand In addition to the 15,000 single family homes that had to be abandoned due primarily to liquefaction associated with the February 22, 2011 M 6.
The review includes a summary of several field case histories indicating greater resistance to liquefaction in aged soils than in young uncemented soils during earthquakes, a discussion of the mechanisms that increase liquefaction resistance with time, an evaluation of proposed methods for quantifying the influence of aging processes or diagenesis on liquefaction resistance K DR , and an evaluation of proposed predictor variables for K DR.