Equipment Overview
This system was independently developed by the research team of the National Key Laboratory for Intelligent Construction and Healthy Operation & Maintenance of Deep Underground Engineering at China University of Mining and Technology. It is designed to meet the experimental requirements for investigating multi-field coupling responses of rock masses under complex deep geological environments.
The system enables simultaneous application of temperature, seepage flow, and stress fields during X-ray CT scanning, realizing real-time visualization and quantitative characterization of internal structural evolution in rocks, together with coupled mechanical–seepage analysis.
It overcomes the limitation of conventional experimental methods in which structural characterization and physical property measurements are performed separately.
The system can be used for in-situ, continuous, and quantitative analysis of pore-fracture evolution, seepage behavior, and mechanical responses of porous media under thermo-hydro-mechanical coupling conditions.

Main Technical Specifications

• 1. Type: Circulating-pressure non-magnetic core holder (rotatable), manufactured using imported high-strength non-metallic materials.
• 2. Pressure capacity: Confining pressure 30 MPa/50 MPa; axial pressure 50 MPa/70 MPa.
• 3. Rock core specimen dimensions: Φ5×30 mm or Φ25×50–100 mm.
• 4. Gas permeability range: 10⁻¹⁴ m²–10⁻²¹ m².
• 5. Operating temperature: Room temperature–120 °C.
• 6. Communication interfaces: Standard RS232 interfaces.
• 7. Expandable connection: Compatible with JHNY-LPM™ ultra-low permeability gas permeability measurement equipment.

Equipment Overview
This system was independently developed for precise characterization of porous media transport properties, gas migration behavior, and breakthrough processes.
The system can be connected with different types of core holders and triaxial pressure cells to perform coupled measurements of permeability and mechanical responses under various stress-path conditions.
It enables quantitative measurement of gas permeability, pressure decay characteristics, gas breakthrough pressure, and gas migration processes.
Applications include coalbed methane, shale gas, tight sandstone gas, gas extraction, nuclear waste geological disposal, and CO₂ geological storage.

Main Technical Specifications

• 1. Test gases: Helium, nitrogen, methane, and other gases.
• 2. Low-permeability measurement accuracy: up to 10⁻²¹ m² (nanodarcy level).
• 3. Pressure range: 0–20 MPa; accuracy 10 mbar, maximum 0.1 mbar.
• 4. Real-time pressure and temperature monitoring with automatic data acquisition.
• 5. Temperature correction and permeability calibration software.
• 6. Supports steady-state and transient-state gas permeability tests.
• 7. Compatible with conventional triaxial pressure cells for coupled temperature–stress–chemical–saturation gas permeability and displacement experiments.

Equipment Overview
This system was independently developed for in-situ evaluation of fluid transport characteristics in engineering-scale rock masses.
It enables measurement of key parameters including pressure attenuation, gas permeability, and gas breakthrough pressure.
Combined with JHNY-DPM™ and JHNY-LPM™ systems, it establishes a cross-scale permeability evaluation framework integrating microscopic pore structure, core-scale properties, and engineering-scale in-situ behavior.

Main Technical Specifications

• 1. Test gases: Helium, nitrogen, methane, and other gases.
• 2. Low-permeability measurement accuracy: up to 10⁻²⁰ m².
• 3. Pressure range: 0–20 MPa; accuracy 10 mbar, maximum 0.1 mbar.
• 4. Real-time pressure and temperature monitoring with automatic data acquisition.
• 5. Borehole diameter: 30–40 mm; borehole length: 1–2 m.
• 6. Enables engineering-scale in-situ gas permeability and breakthrough experiments.
• 7. Equipped with professional temperature-pressure acquisition software and gas migration calculation software.
• 8. Portable design suitable for field testing.

Material Overview
JHNY-LPH™ is a low-pH high-performance grouting material developed for deep underground engineering applications.
It is classified into conventional and ultra-fine types.
The conventional type has:
- pH value after 133 days: <11;
- 28-day compressive strength: 11.59 MPa;
- Injectable fracture aperture: <200 μm.
The ultra-fine type has:
- pH value after 120/200 days: approximately 11.0/10.85;
- 28-day compressive strength: 12.04 MPa;
- Injectable fracture aperture: <50 μm.
The material has been successfully applied in underground engineering laboratories and addresses the adverse effects of highly alkaline grouting materials on argillaceous and clay-bearing rocks.

Main Technical Specifications
Conventional low-pH grouting material:
1. pH value after 133 days: <11.
2. 28-day compressive strength: >11 MPa.
3. Injectable fracture aperture: <200 μm.
Ultra-fine low-pH grouting material:
1. pH value after 133 days: <11.
2. 28-day compressive strength: >11 MPa.
3. Injectable fracture aperture: <50 μm.