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Modeling of Cohesive Crack Propagation in Saturated and Semi Saturated Porous Media

Barani, Omid Reza | 2011

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 41347 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza; Mofid, Massoud
  7. Abstract:
  8. Modeling the water flow in cohesive fracture is a fundamental issue in the crack growth simulation of cracked concrete gravity dams and hydraulic fracture problems. Discontinuities in porous materials such as concrete, soil and rock have important role on the mechanical and hydraulic behavior of a multiphase system. The creation and propagation of discontinuities, such as cracks in a multi-physics system, lead to a complex non-linear coupled problem with continuous topological changes in the domain.In this study, a mathematical model is presented for for the analysis of dynamic fracture propagation in the saturated and semi-saturated porous media. The solid behavior incorporates a discrete cohesive fracture model, coupled with the flow in porous media through the fracture network. The double-nodded zero-thickness cohesive interface element is employed for the mixed mode fracture behavior in tension and contact behavior in compression. The crack is automatically detected and propagated perpendicular to the maximum effective stress. The spatial discretization is continuously updated during the crack propagation. Numerical examples from the hydraulic fracturing test and the concrete gravity dam show the capability of the model to simulate dynamic fracture propagation. The comparison is performed between the quasi-static and fully dynamic solutions, and the performance of two analyses is investigated on the values of crack length and crack mouth opening. The modified crack permeability is applied in fracture propagation based on the data obtained from experimental results to implement the roughness of fracture wa
  9. Keywords:
  10. Porous Media ; Cohesive Crack ; Crack Propagation ; Saturated Porous Medium ; Finite Element Method ; Semi Saturated Porousmedia

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