Analysis for Lateral Displacement of Liquefied Ground
Date Issued
2006
Date
2006
Author(s)
Hsu, Chung-Chieh
DOI
zh-TW
Abstract
Lateral spreading occurred on liquefied ground will cause significant damages to supporting structures and buried facilities. The purpose of this study is to develop a simplified analytical model as well as a numerical model to evaluate the amount of lateral displacement induced by soil liquefactions for engineering applications.
This study follows the analytical approach proposed by Towhata (1992) through modifications and dimensional analysis to deduce a simpler solution. Two sets of approximate solutions are presented which are applicable to the condition of a continuous gently sloping ground and the condition of a river bank with cutting free-face, respectively. For verifications, nine cases of in-situ measurements during past earthquakes are analyzed. Results obtained show that the proposed simplified model can reasonably predict the lateral displacements associated with soil liquefactions.
For numerical modeling, the program FLAC is used to simulate the phenomenon of lateral spreading induced by soil liquefactions. The analysis performed is the effective stress approach modeled with Martin’s pore pressure model. Analysis on two sets of shaking table tests are carried out to verify the applicability of the numerical model proposed. The results show that the numerical approach can reasonably simulate the behavior of lateral displacement of liquefied ground.
For applications, three cases of lateral spreading occurred in 1999 Taiwan Chi-chi earthquake are analyzed with the proposed simplified model and numerical approach. From the results obtained, it is shown that the simplified model can reasonably predict the lateral displacements of liquefied ground, while the numerical approach can simulate the characteristics and mechanism of lateral displacement induced by soil liquefactions. Based on the studies presented herein, the proposed simplified model is convenient and sufficiently accurate to be used for engineering applications.
Subjects
土壤液化
側向變位
簡化分析模式
數值模擬
soil liquefaction
lateral displacement
simplified analytical model
numerical simulation
Type
thesis