EPB TBM Face Support Pressure Calculator

Mechanized Soft Ground Tunneling: Determine required EPB muck chamber support pressure to prevent face collapse and surface blowouts.

Excavated Diameter $D$ (m):

Depth to Crown $C$ (m):

Water Table Depth $z_w$ (m):

Soil Unit Weight $\gamma_{soil}$ ($\text{kN/m}^3$):

Friction Angle $\phi'$ (deg):

Cohesion $c'$ (kPa):

Surface Surcharge $q_s$ (kPa):

Safety Pressure Buffer $\Delta p$ (bar):

Crown Pressure ($p_{crown}$)

-- bar

Axis Pressure ($p_{axis}$)

-- bar

Invert Pressure ($p_{invert}$)

-- bar

Max Heave Limit

-- bar

• Earth Pressure Coefficient ($K_0$): --

• Hydrostatic Water Head at Crown: -- bar

• Hydrostatic Water Head at Invert: -- bar

• Effective Horizontal Stress at Axis: -- kPa

• Required Muck Gradient: -- $\text{bar/m}$

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