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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24149

Title: Modeling the Evolution of Slope Failure as A Crack Propagation Problem
Authors: Jeen-Shang Lin;Cheng-Yu Ku
Contributors: NTOU:Department of Harbor and River Engineering
國立臺灣海洋大學:河海工程學系
Date: 2011
Issue Date: 2011-10-20T08:10:30Z
Publisher: the 11th International Conference on Fracture, Turin, Italy
Abstract: abstract:A comprehensive modeling of the evolution of a slope failure has to address two important issues. One is how the slope becomes unstable; the other how the unstable mass separates itself. This study tackles the first issue considering that the formation the unstable mass to be a mixed mode crack propagation problem. A mesh based partition of unity method, also known as the manifold method, is employed in this undertaking. Because of the method’s root in the discrete element method, it is also capable of modeling discretecontinuum interaction problem. The use of this method, therefore, also takes care of the second issue. Sample problems are solved as an illustration. The problem configuration consists of a simple slope that has a preexisting tensile crack along its crest. The slope failure is triggered by rainfall which raises water pressure in the crack. As the stress around the crack tip increases, an existing crack grows and a failure surface is eventually developed. The maximum stress criterion is adopted in determining the crack growth and growth direction. After a failure surface is formed, the analysis switches from a static to a dynamic formulation. The mechanical interaction between the unstable soil mass and the remaining stable slope dictates how the unstable slope separates itself.
A comprehensive modeling of the evolution of a slope failure has to address two important issues. One is how the slope becomes unstable; the other how the unstable mass separates itself. This study tackles the first issue considering that the formation the unstable mass to be a mixed mode crack propagation problem. A mesh based partition of unity method, also known as the manifold method, is employed in this undertaking. Because of the method’s root in the discrete element method, it is also capable of modeling discretecontinuum interaction problem. The use of this method, therefore, also takes care of the second issue. Sample problems are solved as an illustration. The problem configuration consists of a simple slope that has a preexisting tensile crack along its crest. The slope failure is triggered by rainfall which raises water pressure in the crack. As the stress around the crack tip increases, an existing crack grows and a failure surface is eventually developed. The maximum stress criterion is adopted in determining the crack growth and growth direction. After a failure surface is formed, the analysis switches from a static to a dynamic formulation. The mechanical interaction between the unstable soil mass and the remaining stable slope dictates how the unstable slope separates itself.
URI: http://ntour.ntou.edu.tw/handle/987654321/24149
Appears in Collections:[河海工程學系] 演講及研討會

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