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Dynamic earth pressure on rigid retaining walls induced by a neighboring machine foundation,by the meshless local Petrov-Galerkin method

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Earthquake Engineering and Engineering Vibration 2015年第4期14卷 647-661页

作者： mehdi veiskarami Arash Bahar Erfan Zandi Lak Geotechnical Engineering Division Department of Civil EngineeringUniversity of Guilan Department of Civil and Environmental Engineering School of Engineering No.1Shiraz University Structural Engineering Division Department of Civil EngineeringUniversity of Guilan

Dynamic earth pressure induced by machine foundations on a neighboring retaining wall is analyzed with emphasis on factors which control the intensity and location of the design forces. The meshless local Petrov-Galerkin (MLPG) method is used to analyze the problem for a variety of retaining wall and machine foundation geometries. The soil medium is assumed to be homogeneous and visco-elastic. The machine foundation is idealized as a harmonic sinusoidal dynamic force often encountered in practice. A number of analyses have been made to reveal the effect of the loading frequency, the location and size of the foundation and the soil shear wave velocity on the distribution and magnitude of the dynamic earth pressure. Results indicate that there is a critical frequency and a critical location for which the passive pressure takes the maxima in the entire duration of the dynamic load.

关键词： MLPG retaining wall dynamic loading visco-elastic soil machine foundation

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A statistical method for assessment of the existing correlations of hydrate forming conditions

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Journal of Energy Chemistry 2015年第1期24卷 93-100页

作者： Javad Sayyad Amin Somayye Nikkhah mehdi veiskarami Department of Chemical Engineering University of GuilanRasht 41996-13769 Iran Department of Civil Engineering University of Guilan Rasht 41996-13769 Iran Department of Civil and Environmental Engineering School of Engineering (No.1) Shiraz University Shiraz 71348-51156 Iran

Hydrate formation in the oil and gas industries has been a serious problem for a long time. It may cause many difficulties for instance in gas pipelines blockages. In order to determine the hydrate forming condition, gas gravity method has been used. Several correlations have been proposed based on gas gravity method. Checking the accuracy of the applied correlations is important. In this paper, the leverage approach is used for this purpose. Leverage approach is a statistical method for detection outliers which identifies the applicability domain （AD） of hydrate data predicting correlations and the quality of the existing data. Moreover, the Williams plot is sketched, which is a graphical depiction for determination of the doubtful points. The obtained results showed the existing correlations are all statistically correct and valid to predict hydrate formation temperature, just one data point is out of the applicability domains, and none of the experimental data can be chosen as outliers.

关键词： hydrate formation conditions gas gravity method leverage approach outlier detection

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Foundations bearing capacity subjected to seepage by the kinematic approach of the limit analysis

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Frontiers of Structural and Civil Engineering 2013年第4期7卷 446-455页

作者： mehdi veiskarami Ghasem HABIBAGAHI Civil Engineering Department Faculty of EngineeringUniversity of GuilanRasht P.O.41635-3756Iran Civil and Environmental Engineering Department School of EngineeringShiraz UniversityShiraz P.O.71334-1585Iran

An estimate of the ultimate load on foundations on soil layers subject to groundwater flow has been *** kinematic approach of the limit analysis was employed to find the upper-bound limit of the bearing *** smooth and rough base strip foundations were considered associated with different collapse *** of the groundwater flow leads to a non-symmetric collapse pattern,i.e.,a weak side and a strong side in twosided collapse patterns,depending on the direction of the *** was found that the bearing capacity has a decreasing trend with increase in the groundwater flow gradient and hence,a reduction factor has been introduced to the third term in the bearing capacity equation as a function of the flow gradient.

关键词： foundation bearing capacity limit analysis numerical computation plasticity seepage

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Development of a constitutive model for rockfills and similar granular materials based on the disturbed state concept

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Frontiers of Structural and Civil Engineering 2012年第4期6卷 365-378页

作者： mehdi veiskarami Ali GHORBANI Mohammadreza ALAVIPOUR Department of the Civil Engineering The University of GuilanRashtIran

Behavior of rockfills was investigated experimentally and theoretically.A series of standard triaxial compression tests were carried out on a quarried rockfill material at different stress *** was found that both the stress level and the shear stress ratio,like most of granular materials,controls the behavior of rockfill *** lower shear stress ratios the behavior is much more similar to a nonlinear elastic *** the shear stress goes further,the stressstrain curve shows an elasto-plastic behavior which suggests using the disturbed state concept to develop a constitutive model to predict the stress-strain *** presented constitutive model complies reasonably with the experimental data.

关键词： constitutive model granular material rockfill plasticity disturbed state concept stress level

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Green fuel from coal via Fischer-Tropsch process： scenario of optimal condition of process and modelling

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International Journal of Coal Science & Technology 2018年第2期5卷 230-243页

作者： Hossein Atashil Somayyeh veiskarami Department of Chemical Engineering University of Sistan and Baluchestan Zahedan Iran

Extracting, transportation and the using from fossil fuels can damage to the hydrosphere, the biosphere and the Earth’s atmosphere. But humans always need to this valuable substance. The production of oil derivatives by means of forest waste and coal through the Fischer–Tropsch process is an appropriate solution for the cleanliness of all parts of the environment. For the production of favorite products by the synthesis of Fischer–Tropsch, the performance of the catalyst under different operating conditions should be predictable. For this reason, in this paper, eight mathematical models were determined for the selectivity of five products of methane, light hydrocarbons, gasoline, diesel and wax based on three factors of reduction temperature, time on stream, and H2/CO ratio inlet gas on iron-based catalyst. The results showed that the reduction temperature factor had the most effective on the selectivity of hydrocarbon products, exception diesel, so that the increase of the reduction temperature led to increase of the selectivity of methane, light hydrocarbons, gasoline and reduce of the degree of selectivity of the wax and vice versa. For the diesel selectivity, factor of the H2/CO ratio inlet gas was the most effective than other factors.

关键词：化石燃料醇化程度煤矿煤炭

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