Taisei Corporation and Ark Information Systems (Chiyoda-ku, Tokyo, president: Yasufu Nakajima), which operates systems development and other businesses, have developed a new liquefaction analysis tool that helps evaluate Accurately evaluate the behavior of the ground and surrounding structures during an earthquake. Implemented in the 3DFEM (finite element method) analysis program "TDAPI III", the program has a rich track record in both the construction and civil engineering fields. By using this method to evaluate the safety of liquefaction-resistant structures, reasonable liquefaction countermeasure construction methods and foundation structures can be considered based on more reliable assessments.
Image of analysis results with and without considering groundwater movement (from press release documents)
The mechanism of liquefaction is generally due to the reduction of ground stiffness due to earthquake shaking and ground deformation due to groundwater outflow. When planning appropriate and optimal liquefaction countermeasures and the basic design of structures, it is important to faithfully reproduce the liquefaction mechanism using an analysis program. Conventional liquefaction analysis tools have limited computer processing capabilities and cannot model detailed groundwater movements, making it impossible to fully reproduce liquefaction phenomena.
The newly developed liquefaction analysis tool not only shows conventional ground stiffness deterioration but also accurately represents underground drainage movements. It also reproduces with high accuracy the movement of groundwater due to seismic movements including high frequency components and complex accumulation of geological strata with different densities and permeabilities, in which Liquefaction is a concern. The behavior of liquefaction-related structures was also analyzed with high precision. In the 3D model, it is possible to understand ground displacements, groundwater pressure distribution and the safety of structures, and at the same time easily check areas where liquefaction occurs and the extent of damage. damage of the structure and the effectiveness of countermeasures.
In the future, Taisei Group will use new liquefaction analysis tools to plan various facilities and structures, including high-rise buildings in riverside areas and power plants in the bay area, places with a high risk of liquefaction in the event of a large-scale earthquake. We will work to further improve the functionality and scale of the analytics model.
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