Effects of Grading Shape on Liquefaction Focusing Pore Structures and Percolation


Abstract eng:
When liquefaction occurs owing to seismic motion, erupted sand boils caused by increased excess pore water pressure are observed on the ground surface. Grain size analysis of these erupted sand points show very similar grain size distribution curves. In this study, we conducted model tests and numerical simulations to reveal this liquefaction mechanism considering the local permeability and pore structure. Based on the shaking table test using binary grading, it is confirmed that each maximum excess pore water pressure ratio shows agreement with its densest mixture content ratio, which content ratio also proportional to finer content ratio. This agreement for the liquefaction mechanism is evaluated by simulating the pore structure characteristics, such as void diameter and its continuity, using the discrete element method. The variation in the distribution of these indices shows good agreement with macroscopic permeability; it shows a proportional relation between the void size and its continuity. As for agreement with the experimental result, the pore structure indices show qualitatively good correspondence with excess pore water pressure rising content ratio. Based on the above quantitative agreements, the liquefaction potential according to various gradings is expressed by these interactions.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 682.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)