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A new hybrid algorithm for global optimization and slope stability evaluation

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Journal of Central South University 2013年第11期20卷 3265-3273页

作者： Taha Mohd Raihan khajehzadeh mohammad Eslami Mahdiyeh Civil and Structural Engineering Department National University of Malaysia Civil Engineering Department Anar BranchIslamic Azad University Electrical Engineering Department Science and Research BranchIslamic Azad University

A new hybrid optimization algorithm was presented by integrating the gravitational search algorithm （GSA） with the sequential quadratic programming （SQP）, namely GSA-SQP, for solving global optimization problems and minimization of factor of safety in slope stability analysis. The new algorithm combines the global exploration ability of the GSA to converge rapidly to a near optimum solution. In addition, it uses the accurate local exploitation ability of the SQP to accelerate the search process and find an accurate solution. A set of five well-known benchmark optimization problems was used to validate the performance of the GSA-SQP as a global optimization algorithm and facilitate comparison with the classical GSA. In addition, the effectiveness of the proposed method for slope stability analysis was investigated using three ease studies of slope stability problems from the literature. The factor of safety of earth slopes was evaluated using the Morgenstern-Price method. The numerical experiments demonstrate that the hybrid algorithm converges faster to a significantly more accurate final solution for a variety of benchmark test functions and slope stability problems.

关键词： gravitational search algorithm sequential quadratic programming hybrid algorithm global optimization slope stability

Modified particle swarm optimization for optimum design of spread footing and retaining wall

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第6期12卷 415-427页

作者： mohammad khajehzadeh Mohd Raihan TAHA Ahmed EL-SHAFIE Mahdiyeh ESLAMI Department of Civil Engineering Anar BranchIslamic Azad University Department of Civil and Structural Engineering University Kebangsaan Malaysia Department of Electrical Engineering Anar BranchIslamic Azad University

This paper deals with the economically optimized design and sensitivity of two of the most widely used systems in geotechnical engineering: spread footing and retaining wall. Several recent advanced optimization methods have been developed, but very few of these methods have been applied to geotechnical problems. The current research develops a modified particle swarm optimization (MPSO) approach to obtain the optimum design of spread footing and retaining wall. The algorithm handles the problem-specific constraints using a penalty function approach. The optimization procedure controls all geotechnical and structural design constraints while reducing the overall cost of the structures. To verify the effectiveness and robustness of the proposed algorithm, three case studies of spread footing and retaining wall are illustrated. Comparison of the results of the present method, standard PSO, and other selected methods employed in previous studies shows the reliability and accuracy of the algorithm. Moreover, the parametric performance is investigated in order to examine the effect of relevant variables on the optimum design of the footing and the retaining structure utilizing the proposed method.

关键词： Particle swarm optimization (PSO) Spread footing Retaining wall Sensitivity analysis

Burial and thermal maturity modeling of the Middle Cretaceous-Early Miocene petroleum system,Iranian sector of the Persian Gulf

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Petroleum Science 2015年第3期12卷 367-390页

作者： Zahra Sadat Mashhadi Ahmad Reza Rabbani mohammad Reza Kamali Maryam Mirshahani Ahmad khajehzadeh Petroleum Engineering Department Amirkabir University of Technology Research Institute of Petroleum Industry (RIPI)

The Cretaceous Kazhdumi and Gurpi forma- tions, Ahmadi Member of the Sarvak Formation, and Paleogene Pabdeh Formation are important source rock candidates of the Middle Cretaceous-Early Miocene pet- roleum system in the Persian Gulf. This study characterizes generation potential, type of organic matter, and thermal maturity of 262 cutting samples （marls and argillaceous limestones） from these rock units taken from 16 fields in the Iranian sector of the Persian Gulf. In addition, the burial and thermal histories of these source rocks were analyzed by one-dimensional basin modeling. Based on the total organic carbon and genetic potential values, fair hydro- carbon generation potential is suggested for the studied samples. Based on Tma~ and vitrinite reflectance values, the studied samples are thermally immature to mature for hydrocarbon generation. The generated models indicate that studied source rocks are immature in central wells. The Gurpi and Pabdeh formations are immature and the Ahmadi Member and Kazhdumi Formation are early mature in the western wells. The Pabdeh Formation is within the main oil window and other source rocks are at the late oil window in the eastern wells. The hydrocarbon expulsion from the source rocks began after deposition of related caprocks which ensures entrapment and preserva- tion of migrated hydrocarbon.

关键词： Persian Gulf. Kazhdumi Formation AhmadiMember Gurpi Formation Pabdeh Formation - MiddleCretaceous-Early Miocene petroleum system