Rock Testing Block

Rock Testing Block

Developing new technologies to make use of underground space

In the Rock Testing Block, we conduct research and development aimed at new underground storage for energy, high level radioactive waste disposal sites, etc. We are also working to develop new technologies for existing facilities such as tunnels, underground power generation plants, and water-sealed type underground rock caverns. We use testing equipment having various different load-bearing capacities to test and evaluate the mechanical, hydraulic, and physical properties of rock and bedrock under many different conditions, such as high-pressure environment deep under the ground.

Underground high-pressure natural gas storage system
Underground high-pressure natural gas storage system
High-level radioactive waste disposal facility
High-level radioactive waste disposal facility
Water-sealed type underground cavern
Water-sealed type underground cavern

Types of Testing

  • Triaxial compression test, triaxial creep test, fracture toughness test
  • Cyclic triaxial testing to determine dynamic properties of rocks
  • High-pressure permeability test (80 MPa max.)
  • Testing of various mock-ups using a combination of a load frame and hydraulic pressure generator

Facility Features

  • 0.5 MN, 2.7 MN, and 4.5 MN load testing devices
  • 5 MPa, 30 MPa, and 80 MPa hydraulic pressure generators
  • Triaxial compression testing machine for soft rock (in a thermostatic laboratory)
  • Portable load testing machine
  • Rock specimen molding equipment (surface grinder, cutter, boring machine)
Triaxial compression machine for testing soft rock (in a thermostatic laboratory)
Triaxial compression machine for testing soft rock (in a thermostatic laboratory)
Portable load testing machine
Portable load testing machine

Examples of Tests and Achievements

  • Basic research to build a rock mechanics model presuming a large rock cavern
  • Evaluation of strength and deformation characteristics of soft rock presumed urban underground
  • Performance evaluation of fiber-reinforced concrete materials and woody materials
  • Performance evaluation of crushed rock materials

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