Understanding of shear behavior of particulate material using dem numerical modeling = 개별요소법을 이용한 입상매질의 전단거동 특성파악

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Understanding of shear behavior of soils is very important in engineering application. There are many factors influencing to the shear behavior of soils. In the laboratory tests, end friction at the axial plate changes the result and many researchers try to reduce the effect of end friction by using lubricated plate and specimen area correction. In this study, the effect of boundary condition is studied by numerical simulation using DEM program. End friction increases the critical void ratio. The best method to calculate the deviator stress is suggested by comparison of various area correction methods. Shear behavior is not different according to specimen shape by comparison with triaxial test and true triaxial test. Thus the effect of specimen shape is found to be little in DEM simulation. For safe design, it has been an issue to clarify the critical state of soils. In this study, the uniqueness of critical state is studied by comparison of the critical state parameters derived from various drainage conditions and densities. Critical state line is unique regardless of drained condition and density. By checking the local void ratio in the triaxial test with free wall boundary, the local area of a specimen in which the void ratio is similar to the critical state void ratio is found. The middle part of specimen with end friction has the void ratio similar to the critical state void ratio.
Advisors
Cho, Gye-Chunresearcher조계춘researcher
Description
한국과학기술원 : 건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2008
Identifier
296011/325007  / 020053638
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2008.2, [ v, 56 p. ]

Keywords

PFC3D; DEM; shear behavior; particulate material; critical state; 개별요소법; 전단거동; 입상매질; 한계상태; PFC3D; DEM; shear behavior; particulate material; critical state; 개별요소법; 전단거동; 입상매질; 한계상태

URI
http://hdl.handle.net/10203/31168
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=296011&flag=dissertation
Appears in Collection
CE-Theses_Master(석사논문)
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