SHEAR BANDS DEVELOPED IN SUBSURFACE LAYERS BY STRIKE-SLIP FAULTING -DEM ANALYSIS-

• TANIYAMA Hisashi

  埼玉大学大学院　理工学研究科

Bibliographic Information

Other Title

• 横ずれ断層によって表層地盤に形成されるせん断帯－ＤＥＭ　による解析－
• SHEAR BANDS DEVELOPED IN SUBSURFACE LAYERS BY STRIKE-SLIP FAULTING −DEM ANALYSIS−

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.

Journal

• Doboku Gakkai Ronbunshuu C

  Doboku Gakkai Ronbunshuu C 64 (3), 485-494, 2008

  Japan Society of Civil Engineers

Keywords

• fault
• strike slip
• surface rupture
• DEM
• shear band

Details

• CRID: 1390282680231193728
• NII Article ID: 130004468284
• DOI: 10.2208/jscejc.64.485
• ISSN: 1880604X
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed