Tunel SandBox

Tunnel Geology and Stress Explorer

Lithostratigraphy before and after excavation, plus a simplified stress redistribution view. Intended for learning and explanation, not design.

Geology, geometry, stress, construction

Tunnel diameter (m)

Crown depth below ground (m)

Dip (degrees, positive to the right)

Number of lithostrat layers

Average layer thickness (m)

Fault zone None Normal fault, steep Reverse fault, steep Shear zone, wide

Fault offset (m)

Water table depth from ground (m)

Rock mass class Good rock mass Fair rock mass Poor rock mass Very poor rock mass

In situ stress ratio K0 (Sh / Sv)

Unit weight gamma (kN/m3)

Excavation method NATM sequential excavation TBM shielded excavation

Support level Light Medium Heavy

Advance per step (m)

Before

After

Stress

Before shows lithostratigraphy, groundwater, and tunnel location. After adds excavation, lining, a disturbed zone, and a schematic settlement trough. Stress shows a simplified map of deviatoric stress concentration around the opening, plus principal stress arrows.