Probabilistic Safety Factor of Soil Liquefaction

Abstract:

The most widely used method of liquefaction prediction are perform in deterministic process. The deterministic method according to seismic Chinese code is introduced by Z. CAO et al (2008). The deterministic method used the standard penetration test (SPT) to evaluate the liquefaction of soil. With this method, liquefaction of soil is predicted to occur if the factor of safety(FS), which in the ratio of critical SPT-N value(Resistance) over the actual measurement SPT-N(Load), is less than or equal to one. If the factor of safety greater than one, no soil liquefaction is predicted. Because the significant uncertainties in variable involved in the deterministic factor of safety, the probability method need to use. because the significant uncertainties in the random variables involved, the probabilistic method is needed to predict liquefaction. Probability of failure may be performed in which the liquefaction potential is assessed in term of probability safety factor (central safety factor). The study case is shown that the probabilistic method given the much more information for engineering decision than the deterministic method that given only the safety factor..

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 2414-2418
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.2414
• Online since: November 2012
• Authors: Sanguan Vongchavalitkul
• Keywords: Central Safety Factor, Deterministic , Liquefaction, Probabilistic, Probability of Failure, Reliability Index

References

[1] Phoon, K. K. and Kulhawy, F. H.: Characterization of Geotechnical Variability, Canadian GeotechnicalJournal, 36-6, 1999, pp.612-624

DOI: 10.1139/t99-038

[2] Seed, H. B. and Idriss, I. M.: Simplified Procedure for Evaluating Soil Liquefaction Potential, Journal Soil Mechanics and Foundation Division, ASCE, SM9, 1971, pp.249-1273.

DOI: 10.1061/jsfeaq.0001662

[3] Seed, H. B., Tokimatsu, K., Harder, L.F. and Chung, R. M.: Influence of SPT Procedures in Soil Liquefaction Resistance Evaluations.Journal Geotechnical Engineering, ASCE, 111-12, 1985, pp.1425-1445

DOI: 10.1061/(asce)0733-9410(1985)111:12(1425)

[4] Zhenzhong CAO, Xiaoming YUAN, Longwei CHEN : A Formula for Calculating Liquefaction Probability Based on Chinese Seismic Code, The 14th World Conference on Earthquake Engineering, October 12-17, 2008, Beijing, China