Liquefaction Potential Evaluation Based on In Situ Testing

Abstract

In this chapter, three procedures for evaluating liquefaction potential based on in situ testing are introduced. Procedure I is the assessment of “triggering” (initiation) of soil liquefaction. Soil type is very important for assessment of this initiation. Clay content, liquid limit, and water content are used to evaluate the potential initiation of soil liquefaction. Procedure II is the assessment of liquefaction resistance based on in situ tests, which is the main content of this chapter. The methods that can be used to evaluate liquefaction are the standard penetration test (SPT), cone penetration test (CPT), dynamic cone penetration test (DPT), Becker penetration test (BPT), and shear wave velocity (V S ) test. The liquefaction resistance can be obtained by calculating the penetration resistance in empirical equations. The tests will be introduced based on the test apparatus and test procedure, and data analysis for liquefaction potential evaluation. Procedure III is assessment of the site liquefaction index and deformation of liquefiable sites. In this procedure, the depth and thickness of the liquefiable soil layer should be considered. Finally, the site liquefaction potential can be calculated by integrating all test points. Assessment of soil seismic deformation will also be introduced in this chapter.