Physical model to study tunnel squeezing under true-triaxial stress state (UTI-UTC 30)

This project develops a novel physical modeling framework to investigate the phenomenon of tunnel squeezing in weak or highly stressed rock masses under true-triaxial stress conditions. Tunnel squeezing—characterized by excessive and time-dependent ground deformation around the tunnel perimeter—poses significant challenges to safe and cost-effective tunnel construction. To simulate this behavior, a miniature tunnel boring machine (TBM) is integrated into a true-triaxial apparatus capable of replicating realistic in-situ stress states. The model allows for controlled excavation in synthetic clay-rich rock analogs and incorporates real-time measurement of displacement, strain, and support system response. Experimental data are complemented with analytical and numerical analyses to evaluate failure mechanisms and the interaction between the TBM, tunnel liner, and surrounding ground. The research aims to provide a deeper understanding of tunnel-ground interactions under squeezing conditions and guide the development of robust tunneling strategies and support systems for use in challenging geological environments.

Language

• English

Project

• Status: Completed
• Funding: $428,484.00
• Contract Numbers:

  69A3551747118

• Sponsor Organizations:

  University Transportation Center for Underground Transportation Infrastructure

  Colorado School of Mines
  Golden, CO  United States  80401

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  Colorado School of Mines

  1500 Illinois St
  Golden, CO  United States  80401
• Performing Organizations:

  Colorado School of Mines

  1500 Illinois St
  Golden, CO  United States  80401
• Principal Investigators:

  Hedayat, Ahmadreza

  Gutierrez , Marte

• Start Date: 20170801
• Expected Completion Date: 20200430
• Actual Completion Date: 20200501
• USDOT Program: University Transportation Centers

Subject/Index Terms

• TRT Terms: Deformation; Mathematical methods; Scale models; Soil structure interaction; Triaxial shear tests; Tunnel borers
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01954480
• Record Type: Research project
• Source Agency: University Transportation Center for Underground Transportation Infrastructure
• Contract Numbers: 69A3551747118
• Files: UTC, RIP
• Created Date: May 7 2025 5:23PM