کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4744194 1359364 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical analysis of overburden soil subjected to strike-slip fault: Distinct element analysis of Nojima fault
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Numerical analysis of overburden soil subjected to strike-slip fault: Distinct element analysis of Nojima fault
چکیده انگلیسی

A distinct element method analysis is carried out to examine the development of shear bands in overburden soil subjected to a strike-slip fault. About 2.3 million spherical particles are used in the analysis and the results are compared with the shears observed at the Nojima earthquake fault during the 1995 Hyogoken Nanbu earthquake. En echelon shears and secondary shears which strike at lower angles to the basement fault – typical in strike-slip faults – are observed in the numerical analysis. Simple shear in the horizontal plane and drag due to the dependence of velocity on depth are confirmed to control the helicoidal shape of Riedel shears. Rotation of the compressional direction toward the fault strike as a result of slip along Riedel shears is also verified. It is found that the compressional direction is more horizontal within the area enclosed by Riedel shears than in outside areas and that these compressional directions produce secondary lower-angle shears that are less helicoidal. It is shown that the formation of column-like structures of particles and their subsequent buckling play significant micromechanical roles in three-dimensionally wrenched shears. The results of the numerical analysis, such as shear intervals and striking angles, show a resemblance to observational results at sites where sediment contains coarse grains and is subjected to strike slip with a small dip component, although they are not exactly the same as those observed at locations with similar overburden thicknesses.


► Shear bands associated with the Nojima fault are reproduced by distinct element method.
► Horizontal simple shear and depth-dependent slip produce helicoidal Riedel shears.
► Rotation of compressional direction causes secondary shears that are less helicoidal.
► Column-like structures play significant micromechanical roles in wrenched shears.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Geology - Volume 123, Issue 3, 13 November 2011, Pages 194–203
نویسندگان
,