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Test Facilities




Earthwork test facilities

　The earthwork test facilities include four types of concrete pits. Various full-scale earthwork experiments can be carried out at the concrete pits, including tests to confirm solidification by chemical grouting and compaction machine tests.


  • Mountain retaining wall test site (8m wide x 15m long x 4m deep)
  • Large-sized earth tank pit x 1 (8m wide x 15m long x 4m deep)
  • Medium-sized earth tank pits x 2 (4m wide x 8m long x 4m deep)
  • Small-sized earth tank pits x 2 (4m wide x 4m long x 4m deep)
  • Longer-type earth tank pit x 1 (5m wide x 40m long x 4m deep)
  • Overhead traveling cranes (15t/1t, top running, double rail)


Embankment compaction experiment

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Earthwork management test site

　The earthwork management test site is used to construct structures whose behaviors are difficult to predict in model tests, e.g. earth retaining structures and foundation structures, to examine long-term stability and test new construction methods and execution management method.
　Facilities include gantry cranes (15t/5t) and a static loading machine (max. load of 200tf) in place.


Geotextile reinforced retaining wall


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Medium-sized centrifuge test facility
　This facility is used for studying ground behavior in a centrifugal field by attaching a　geometrically-scaled ground model to the centrifuge test device which provides centrifugal acceleration. Compared with tests in a gravitational field, this test method assumes a clearer similarity law and can reproduce a stress state equivalent to that in a full-scale case.

  • Effective turning radius: 3.5m
  • Maximum centrifugal acceleration: 140G
  • Maximum load: 1000kg


Medium-sized centrifuge test device


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Test facility for improving the construction site working environment
　This experimental tunnel is used for full-scale measurement of the concentration and behavior of dust generated and scattered during such works as tunnel construction, chipping work on deteriorated concrete and concrete spraying. The tunnel is 8m high, approx. 13m wide and 100m long (the concrete portion being 30m) with a sectional area of 80m2. There are a fan blower (max. blowing capacity: 1500m3/min) and a dust collector (max. air volume: 1800m3/min).


　
Left:Exterior of the experimental tunnel facility
Right:Excavating a bedrock model　made of concrete
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