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Project Title:

State of the Art and Practice in Earthquake Induced Soil Liquefaction Assessment
PIN: DELS-BESR-11-02        

Major Unit:

Division on Earth and Life Studies

Sub Unit: Board on Earth Sciences & Resources

RSO: Magsino, Sammantha

Subject/Focus Area: Earth Sciences; Engineering and Technology


Project Scope
An ad hoc committee of the National Research Council will solicit input from the technical community and critically examine the technical issues regarding liquefaction hazard evaluation and consequence assessment. The study will assess and evaluate

*Sufficiency, quality, and uncertainties associated with laboratory and in situ field tests, case histories, and physical model tests to develop and assess methods for determining liquefaction triggering, and the resulting loss of soil strength and its consequences;  
                                                                                                  
*Methods to conduct and analyze laboratory and physical model testing and to collect and analyze field case history data to determine the triggering of liquefaction, and post-liquefaction soil behavior (e.g. strength loss, dilation, and hardening);

*Adequacy and accuracy of empirical and mechanistic methods to evaluate liquefaction triggering and post-liquefaction deformations of earth structures and structures founded on or in the earth, such as large embankment dams, levees, dikes, pipelines, highway embankments, bridges, pile-supported decks, and other structural foundations. Effects at large depths and high static shear stresses on liquefaction triggering and post-earthquake shear strength will be among those addressed.

The study will focus on developments since the 1996 National Center for Earthquake Engineering Research (NCEER) and the 1998 National Science Foundation/NCEER workshops on liquefaction issues and consider data including those related to soil properties, site characterization, ground motions, and observations and measurements of soil response (e.g., post liquefaction deformations). Inherent characteristics associated with the data (e.g., uneven distribution, scarcity, uncertainty) will be investigated. The study will include a workshop on data gathering, vetting of field and laboratory data, and new developments in the assessment of earthquake induced soil liquefaction. The final report will assess the state-of-the-art and practice for liquefaction analyses and will address future directions for research and practice related to (i) collecting, reporting, and assessing the sufficiency and quality of field case history observations as well as in situ field, laboratory, and model test data; (ii) addressing the spatial variability and uncertainty of these data; and (iii) and developing more accurate tools for assessing liquefaction triggering and its consequences.

The project is sponsored by the Bureau of Reclamation, U.S. Nuclear Regulatory Commission, the American Society of Civil Engineers and the Geo-Institutes, the Port of Los Angeles, the Los Angeles Department of Water and Power, the Federal Highways Administration, and the Port of Long Beach.

The approximate start date for the project is June 1, 2013.

A report will be issued at the end of the project in approximately 18 months.


 
Project Duration: 22 months    

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Committee Membership
Committee Membership

Meetings
 Meeting 1 - 11/12/2013
 Meeting 2 - 12/20/2013
 Meeting 3 - 01/14/2014
 Meeting 4 - 01/16/2014
 Meeting 5 - 02/07/2014
 Meeting 6 - 03/04/2014
 Meeting 7 - 03/09/2014
 Meeting 8 - 04/04/2014
 Meeting 9 - 05/07/2014
 Meeting 10 - 06/09/2014
 Meeting 11 - 07/14/2014

Reports

Reports having no URL can be seen
at the Public Access Records Office