Geotechnical Designs
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Geotechnical insights

Field-tested articles on rock mechanics, slope stability, foundations and tunnel design — shared from active projects.

"Multiple Graph" approach for Rock Tunnelling Excavation Assessment
Tunnels

"Multiple Graph" approach for Rock Tunnelling Excavation Assessment

"Multiple graph" approach** designed for the **preliminary assessment of rock mass behavior** during tunnel excavation. By utilizing a four-sector logical framework, the method quantifies **rock mass fabric, strength, competency, and self-supporting capacity** to identify potential geological hazards. Key metrics such as the **Geological Strength Index (GSI)** and **Rock Mass Rating (RMR)** are integrated to predict phenomena like **squeezing, spalling, and rockbursts**. This tool serves both the **initial design phase** for hazard detection and the **construction phase** for selecting appropriate support measures at the tunnel face. Through empirical correlations and probabilistic analysis, the approach provides a **systematic way to simplify complex geomechanical data** into actionable engineering insights. The author concludes that while based on simplified assumptions, the graphs offer a **robust and user-friendly tool** for managing risks in underground rock engineering.

26 July 2026