Doboku Gakkai Ronbunshuu C
Online ISSN : 1880-604X
ISSN-L : 1880-604X
Paper (In Japanese)
SHEAR BANDS DEVELOPED IN SUBSURFACE LAYERS BY STRIKE-SLIP FAULTING −DEM ANALYSIS−
Hisashi TANIYAMA
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JOURNAL FREE ACCESS

2008 Volume 64 Issue 3 Pages 485-494

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Abstract
Surface displacement due to shallow inland earthquakes often causes damage to structures. A number of model tests were performed to examine the deformation of unconsolidated sediment subjected to fault displacement. In the case of strike-slip faults, the development of shear bands in subsurface layer has not been completely reproduced numerically, and the mechanism of surface fault rupturing has not been fully elucidated. In this study, DEM analysis was conducted to simulate model tests of strike-slip faulting. Development of shear bands and its mechanism were investigated. The analysis reproduced shear bands typical of strike slip faults; e.g. shear bands in the form of flower structures and en echelon Riedel shears. It was found that the development of flower structures and Riedel shears was attributable to the stress due to dilatancy and the shear in the vertical plane. The results also corroborated that secondary lower-angle shears developed under the stress field which Riedel shears reoriented.
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© 2008 by Japan Society of Civil Engineers
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