The squeezing of tunnels is a common phenomenon in poor rock masses under high in situ stress conditions. The critical strain parameter is an indicator that allows the degree of squeezing potential to be quantified. It is defined as the strain level on the tunnel periphery beyond which instability and squeezing problems are likely to occur. If not anticipated, these could add huge time delays and surprise costs to the project—not to mention the threat of complete collapse if undetected. 

However, there are some highly effective systems designed to ameliorate these situations. Support systems like TH Profiles and Honeycomb Type Stress Controllers are the most popular, and we’re highly experienced in each Roof Support Systems.

Risk Faced

  • Sudden Collapses
  • Rock burst
  • Human Safety
  • Uncertain Rock Fall Due To Unconfined Strata
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challenges image


  • Thrust Zones
  • Shear Zones
  • In-situ Stresses
  • Seismicity
  • Sliding Rock Mass
  • Uncertain Rock Movements
  • Unconsolidated Rock Mass
  • Saturated Zones
  • Highly Weathered Rock Mass

Product Matrix

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