Longwall Surface Subsidence Profile Calculator

Underground Mining & Surface Protection: Model longwall panel extraction subsidence profiles ($S(x)$), ground slope/tilt ($G$), horizontal tensile/compressive strains, and draw limits.

Longwall Panel Dimensions

Seam Extraction Thickness $m$ (m):

Panel Face Width $W$ (m):

Depth of Cover $H$ (m):

Subsidence Factor $a$ ($S_{\text{max}}/m$):

Angle of Draw $\xi$ (deg):

Surface Offset from Center $x$ (m): Rib edge = W/2 (125 m)

Ground Movement & Structural Hazard

Subsidence at Query Offset ($S$)

-- m

Maximum S_max: -- m

Building Damage Category

Light / Negligible

NCB Classification Standard

Peak Ground Tilt / Slope ($G_{\text{max}}$)

-- mm/m

Slope: -- % grade

Peak Tensile Strain ($\varepsilon_{\text{max}}$)

-- mm/m

Peak Compressive: -- mm/m

Panel Geometry Status:

• Width-to-Depth Ratio $W/H$: -- (Supercritical)

• Limit of draw influence distance: -- m from panel edge

• Inflection point (half-subsidence $S = S_{\text{max}}/2$): sits near the rib edge.

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Longwall Surface Subsidence Profile Calculator

Longwall Panel Dimensions

Ground Movement & Structural Hazard

Frequently Asked Questions