The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Fatemeh Bodaghi - One of the best experts on this subject based on the ideXlab platform.

  • Slope Stability Analysis Based on the Numerical Manifold Method and the Graph Theory-Case Study Evaluation
    Geotechnical and Geological Engineering, 2020
    Co-Authors: Saeed Ghaffarpour Jahromi, Fatemeh Bodaghi
    Abstract:

    Contemporary major Methods among the most common and traditional Methods for soil and rock slope stability analysis are the limit Equilibrium Method and the strength reduction Methods. Both Methods are based on the limit Equilibrium conditions. However, the limit Equilibrium Methods are limited to the stiff body assumption, while the strength reduction Method has expansive calculations and simulation progresses. In this study, a search algorithm is proposed to access the critical slip surface and safety factor. The numerical manifold Method, which based on existing stress, is used to analysis and obtain the stress distribution of soil and rock slopes cut by joints. Based on the stress results obtained, a graph theory is used to convert the solution of the critical slip surface to a shortest path problem, which can be directly solved by the Bellman–Ford algorithm. This Method can completely remove the rigid body assumptions in the limit Equilibrium Method and reduce computations which existing in the strength reduction Methods.

Peng Gong-xun - One of the best experts on this subject based on the ideXlab platform.

Saeed Ghaffarpour Jahromi - One of the best experts on this subject based on the ideXlab platform.

  • Slope Stability Analysis Based on the Numerical Manifold Method and the Graph Theory-Case Study Evaluation
    Geotechnical and Geological Engineering, 2020
    Co-Authors: Saeed Ghaffarpour Jahromi, Fatemeh Bodaghi
    Abstract:

    Contemporary major Methods among the most common and traditional Methods for soil and rock slope stability analysis are the limit Equilibrium Method and the strength reduction Methods. Both Methods are based on the limit Equilibrium conditions. However, the limit Equilibrium Methods are limited to the stiff body assumption, while the strength reduction Method has expansive calculations and simulation progresses. In this study, a search algorithm is proposed to access the critical slip surface and safety factor. The numerical manifold Method, which based on existing stress, is used to analysis and obtain the stress distribution of soil and rock slopes cut by joints. Based on the stress results obtained, a graph theory is used to convert the solution of the critical slip surface to a shortest path problem, which can be directly solved by the Bellman–Ford algorithm. This Method can completely remove the rigid body assumptions in the limit Equilibrium Method and reduce computations which existing in the strength reduction Methods.

James C. Keck - One of the best experts on this subject based on the ideXlab platform.

  • combustion modeling of mono carbon fuels using the rate controlled constrained Equilibrium Method
    Combustion and Flame, 2009
    Co-Authors: Mohammad Janbozorgi, Sergio Ugarte, Hameed Metghalchi, James C. Keck
    Abstract:

    Abstract The rate-controlled constrained-Equilibrium (RCCE) Method for simplifying the kinetics of complex reacting systems is reviewed. This Method is based on the maximum entropy principle of thermodynamics and involves the assumption that the evolution of a system can be described using a relatively small set of slowly changing constraints imposed by the external and internal dynamics of the system. As a result, the number of differential and algebraic equations required to determine the constrained-Equilibrium state of a system can be very much smaller than the number of species in the system. It follows that only reactions which change constraints are required to determine the dynamic evolution of the system and all other reactions are in Equilibrium. The accuracy of the Method depends on both the character and number of constraints employed and issues involved in the selection and transformation of the constraints are discussed. A Method for determining the initial conditions for highly non-Equilibrium systems is also presented. The Method is illustrated by applying it to the oxidation of methane (CH 4 ), methanol (CH 3 OH), and formaldehyde (CH 2 O) in a constant volume adiabatic chamber over a wide range of initial temperatures, pressures, and equivalence ratios. The RCCE calculations were carried out using 8–12 constraints and 133 reactions. Good agreement with “Detailed Kinetic Model” (DMK) calculations using 29 species and 133 reactions was obtained. The number of reactions in the RCCE calculations could be reduced to 20 for CH 4 , 16 for CH 3 OH, and 12 for CH 2 O without changing the results significantly affecting the agreement. It may be noted that a DKM with 29 species requires a minimum of 29 reactions.

Da Juan Yin - One of the best experts on this subject based on the ideXlab platform.