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RECENT ADVANCES IN SOIL LIQUEFACTION ENGINEERING



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RECENT ADVANCES IN SOIL LIQUEFACTION ENGINEERING AND SEISMIC SITE RESPONSE EVALUATION Seed R B University of California Berkeley California 94720 Cetin K O Middle East Technical University Ankara Turkey Moss R E S Kammerer A M Wu J Pestana J M Riemer M F University of California Berkeley California 94720 ABSTRACT Over the past decade major advances have occurred in both understanding and practice with regard to engineering treatment of seismic soil liquefaction and assessment of seismic site response Seismic soil liquefaction engineering has evolved into a sub field in its own right and assessment and treatment of site effects affecting seismic site response has gone from a topic of controversy to a mainstream issue addressed in most modern building codes and addressed in both research and practice This rapid evolution in the treatment of both liquefaction and site response issues has been pushed by a confluence of lessons and data provided by a series of earthquakes over the past eleven years as well as by the research and professional political will engendered by these major seismic events Although the rate of progress has been laudable further advances are occurring and more remains to be done As we enter a new millenium engineers are increasingly well able to deal with important aspects of these two seismic problem areas This paper will highlight a few major recent and ongoing developments in each of these two important areas of seismic practice and will offer insights regarding work research in progress as well as suggestions regarding further advances needed The first part of the paper will address soil liquefaction and the second portion will briefly address engineering assessment of seismic site response INTRODUCTION Soil liquefaction is a major cause of damage during earthquakes Modern engineering treatment of liquefactionrelated issues evolved initially in the wake of the two devastating earthquakes of 1964 the 1964 Niigata and 1964 Great Alaska



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