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Coupled pile soil interaction analysis in undrained condition

journal of Central South University 2013年第5期20卷 1376-1383页

作者： M.y.Fattah F.A.Salman y.j.al-shakarchi A.M.Raheem Building and Construction Engineering Department University of Technology Department of Civil Engineering Faculty of EngineeringUniversity of Malaya Department of Civil Engineering College of EngineeringUniversity of Baghdad Department of Civil Engineering College of EngineeringUniversity of Kirkuk

The effective stress method is developed to predict the axial capacity of piles in clay. The effective stress state changes due to the resulting pore pressure change and therefore, the strength and stiffness of the soil will change. In this work, the finite element method is utilized as a tool for the analysis of pile-soil systems in undrained condition. The computer program CRISP was developed to suit the problem requirements. CRISP uses the finite element technique and allows predictions to be made of ground deformation using critical state theories. Eight-node isoparametric element was added to the program in addition to the slip element. A pile loading problem was solved in which the pile-soil system is analyzed in undrained condition. The pile is modelled as elastic-plastic material, while the soil is assumed to follow the modified Cam clay model. During undrained loading condition, the settlement values increase by 22% when slip elements are used. The surface settlement increases by about three times when the load is doubled and the surface settlement at all points increases when using slip elements due to the mode of motion which allows smooth movement of the adjacent soil with respect to the pile. The vertical displacement increases as the distance decreases from the pile and negligible values are obtained beyond 10D (where D is the pile diameter) from the center of the pile and these values are slightly increased when slip elements are used. The vertical effective stress along a section at a distance D from the pile center is approximately the same for all load increments and lower values of effective vertical stress can be obtained when slip elements are used.

关键词： pile finite element coupled analysis undrained condition

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New High Tc-Value Investigated in Superconducting System yBa2（C u3）1-xA gxO6.5x＋δ

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journal of Physical Science and Application 2012年第9期2卷 352-358页

作者： Emad K. al-shakarchi Salwan K.j. al-Ani Wedad. M. Faysal Physics Department College of Science Al-Nahrain University Baghdad Iraq Physics Department College of Science Baghdad University Baghdad Iraq

A ceramic superconductor compound with composition yBa2（C u3）1-xA gxO6.5x＋δhas been prepared experimentally by solid state reaction from principal roots of high purity materials like y203, BaO, CuO and Ag20. The study was concentrated on the effect of partial substitution of Ag with respect to Cu atoms by the ratios （x = 0, 1, 0.2, 0.3, 0.4 and 0.5） through different analysis and measurements. X-ray diffraction （XRD）, Scanning Electron Microscope （SEM） and Resistivity measurement is play an important role to show the improvement on high superconducting phase. It was found that the best substituted value of （x = 0.5） investigated a favor value of Tc equal nearly to （123 K）, due to more excess of Ag atoms in the structure. X-ray diffraction showed an orthorhombic structure related to high-To phase with high stability through diminishing some peaks related to low temperature superconducting phase, that was related to presence of multiphase derivative from yBCO-phase. SEM pictures give us more details on the surface morphology, grain and grain boundaries, it gives an indication on successful of sintering process, the last one is very important in forming superconducting phase.

关键词： Superconductor compound 123-compound resistivity measurements X-ray diffraction.

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