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Numerical Modeling of Jet Grouting Cells to Reduce Liquefaction

2019

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  • مطالب مشابه

    • توسط admin
      Single Piles in Liquefiable Ground : Seismic Response and Numerical Analysis Methods
      Abstract
      The seismic response of piles in liquefiable ground is an important and challenging
      topic in the field of geotechnical earthquake engineering. Through a combination of
      case analysis, centrifuge shaking table experiments and numerical simulations, the
      seismic response patterns of single piles in liquefiable ground are revealed, and the
      axial pile force and settlement during post-earthquake reconsolidation is studied.
      A complete set of numerical method for the analysis of single piles in liquefiable
      soils is established, consisting of constitutive formulations, numerical algorithms
      and modelling techniques. The main achievements are as follows:
      1. A three-dimensional unified plasticity model for large post-liquefaction shear
      deformation of sand is formulated and implemented for finite element analysis,
      based on which a three-dimensional dynamic finite element analysis method for
      piles in liquefiable ground is developed. The constitutive model is able to
      achieve a unified description of the behaviour of sand at different states under
      monotonic and cyclic loading during both pre- and post-liquefaction regimes.
      Appropriate stress integration algorithm, three-dimensional stress projection
      algorithm and parallel computation techniques are applied in the OpenSees
      implementation of the model. The potential of the model and its numerical
      implementation are explored via simulations of classical element and centrifuge
      experiments. The finite element analysis method is validated against centrifuge
      shaking table experiments.
      2. Methods for the analysis of consolidation and reconsolidation-induced pile axial
      force and settlement with a consideration for consolidation process are proposed.
      A beam on nonlinear Winkler foundation (BNWF) solution and a
      modified neutral plane solution are developed and validated against centrifuge
      experiments for piles in consolidating and reconsolidating ground.
      3. The seismic response of single piles in liquefiable ground is studied, including
      basic force-resistance mode, kinematic and inertial interaction coupling mechanism
      and major influence factors. The roles of kinematic and inertial effects
      could differ due to the difference in rotational constraint at the pile head.
      Moment caused by kinematic and inertial interaction is opposite for single piles
      with pile cap, while being of the same direction for single piles without pile
      cap. The total moment caused by dynamic interaction is affected by both the
      amplitude and the phasing of the two types of interactions. The dominating
      forces for piles with and without caps are kinematic and inertial forces,
      respectively. Pile residual moment increases with increasing lateral spreading in
      sloping ground. The existence of a non-liquefiable layer over the underlying
      liquefiable layer may cause the maximum moment to occur at the layer interface.
      4. The axial forces and settlement of piles during post-earthquake reconsolidation
      were analysed. The maximum pile axial force caused by post-earthquake
      induced negative friction is irrelevant to the reconsolidation process, and is only
      determined by the final state of the ground. However, pile settlement is
      dependent on the soil settlement at the neutral plane during reconsolidation,
      while the neutral plane position changes during the reconsolidation process.
      Keywords : Liquefaction Pile foundation Constitutive model Seismic response
      pattern Numerical analysis method

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    • توسط admin
      Numerical modelling of steel-plate concrete composite shear walls
      Nam H. Nguyena,Andrew S. Whittakerb

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    • توسط admin
      Investigation of Vs – based liquefaction charts using a heavily preshaken silty sand centrifuge deposit
      T. Abdouna,c, W. El-Sekellyb,c,⁎, R. Dobrya
      a Dept. of Civil and Environmental Eng., Rensselaer Polytechnic Institute, 110 8th Street, JEC 4049, Troy, NY 12180, USA
      b Dept. of Structural Engineering, Mansoura University, Mansoura 35516, Egypt
      c New York University Abu Dhabi, Abu Dhabi, UAE
       

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    • توسط admin
      مقاوم سازی خاک با روش جت گروتینگ
      فیلم به مدت تقریبی 3 دقیقه
      به نقل از کانال تلگرام civilca
      دانلود از پیوست
       

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    • توسط admin
      فیلم از پدیده روانگرایی در ژاپن
      شامل دو فیلم کوتاه هر کدام در حدود سه دقیقه

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