THE STUDY ON PROBABILISTIC EVALUATION OF
SOIL LIQUEFACTION
Y. Yao Chi* and Li Ting Ou
Department of Land Management and Development
Chang Jung Christian University
396 Chang Jung Rd., Sec.1 Kway Jen, Tainan, Taiwan, R.O.C.
Ph:(886)06-2785123#2317; Fax:(886)06-2785902
E-mails: yunyao@mail.cju.edu.tw(Chi); ivyo@ms65.url.com.tw (Ou)
*Corresponding author
ABSTRACT
In the present study, a new evaluation method of annual liquefaction probability
was developed based on both Davies and Berrill’s (1982)seismic energy dissipation
theory and Juang and Chen’s (2000) limit state methodology to change seismic loading
for search the liquefaction and non-liquefaction curve. Furthermore in this paper, the new
approach was developed using the average annual liquefaction probability (AALP)of
divided soil layer to represent the AALP of over hole. The AALP of local area is in
Yunlin, where had been liquefied during Chi-Chi earthquake 1999 was calculated as an
example. The result shown that the AALP of surface sand layer more than the second
sand layer ones, that conform to the generally opinion.Mapping of AALP for Yunlin area
that revealed the high AALP area was between south of county road No.148 and west of
county road No.137, that AALP was approximately 0.01 and the average return period of
liquefaction was approximately 100 years. The distribution characteristics of liquefaction
average probability were further examined and discussed.
Key Words: liquefaction, probability, seismic energy dissipation, evaluation.