About ARL Research

Geotechnical / Geo-environmental Engineering Research Center

KEYWORDS
  • Soil Investigation
  • Liquefaction Countermeasures
  • Soil Structure

Development of technology to reduce geohazards

In order to moderate the increasing threat of natural hazards, and with a particular aim at preventing geohazards such as soil liquefaction and slope failures, the latest developments in fields including soil research, liquefaction countermeasures, and the construction of soil structures are being studied Although our research themes have evolved in tandem with changing social requirements, our center remains committed to addressing these and other issues through collaborative efforts.

Research staff

  • Director/Professor

     

    Naoaki Suemasa

  • Associate Professor

     

    Kazuya Itoh

  • Engineer

     

    Tsuyoshi Tanaka

  • Research Assistant

    Kentaro Uemura

  • Collaborative researcher

    Kouichi Nagao

  • Collaborative researcher

    Takamitsu Sasaki

Research themes

Liquefaction Countermeasure using micro-bubbles and particles injectedinto the ground

While various kinds of liquefaction countermeasure methods have been developed for the construction of large-scale important structures, including buildings, there are few for small-scale constructions, such as residential houses. With that point in mind, we have developed a simple and economical method that involves micro-bubbles and water injections. However, it has proven difficult to apply our bubble method to practical use because the bubbles are as breakable as the bubble economy used to be. As a result, we are now developing a new micro-bubble and micro-particle injection method.

New soil investigation technique using Screw Drive Sounding

Swedish Weight Testing (SWT), which is a highly portable and economical in-situ soil testing method, has been widely used for liquefaction countermeasures. However, it has disadvantages include inaccuracies depending on soil type, especially in cases involving hard soil, and being affected by friction. While making the most of SWT's advantages, we have been developing the screw drive sounding (SDS) method to facilitate more effective and accurate soil investigations.

Development of reinforcingand repairing methods for soft ground and soil structures

In order to create and support safer life environments, we have developed effective methods to prevent sediment-related disasters due to earthquakes or torrential rain. We are also studying ways to repair soil structures damaged by uneven settlement and to reinforce soft ground in order to prevent uneven settlement.

Our distinctive research and facility

Centrifuge Apparatus

This special experimental apparatus enables us to simulate an actual sized model by testing a miniaturized model at high rotational speeds. Although this is testing method still rare elsewhere, we have more than 20 years of experience in this field.

Model Ground Improvement Machine

This machine is used to make improved pile-formed bodies by conducting boring using special screws while mixing the ground and cement. Our investigations have examined the most effective screw shapes and the best cement and soil ratios by considering influences from soil properties and temperature.

Transparent Ground

Transparent ground can be made by mixing liquids with the same refractive indexes – such as liquid paraffin, sugared water, or sodium iodide – with crushed sand-size molten quartz. The photograph on the right shows the penetration of a screw auger into a transparent ground sample. The use of transparent ground enables us to visualize three-dimensional ground behaviors and has great potential for application in various other fields of study.

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