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Ground subsidence and structural damage over an abandoned room-and-pillar coal mine at Hegeler, Illinois.

Marino GG; Mahar JW; Powell LR; Thill RE

MISSING 1986; :1-24

10005117

The Bureau of Mines and the University of Illinois investigated surface characteristics and damage to structures from mine subsidence over a room-and-pillar coal mine in Hegeler, Illinois. Data on three adjacent subsidence sags and associated structural damage were collected, summarized, and evaluated. The subsidence sags developed over a 10-year period and took place above a modified room-and- pillar operation mining the Herrin (No. 6) Coal at a depth of 130 to 135 ft. Surface vertical displacements of 3.0 to 3.5 Ft resulted from extracting 6.1 to 6.4 Ft of coal. Ground movements associated with sag formation severely damaged three houses and a radio station building, broke numerous utility lines, and structurally distorted three radio transmission towers. The radio station was remodeled and the towers repaired, but the three houses were subsequently demolished. Surface waters collecting in the subsidence depressions caused failure of radial ground transmission systems. The following subsidence profile characteristics were determined at the radio station and one of the houses, respectively: profile slopes, 0.02 and 0.07; Maximum curvatures, 2.3 X 10-4ft-1 and 3.0 X 10-4ft-1; and angular distortions, 6.6 X 10-3 and 62.0 X 10-3.

Mining; Subsidence; Room and pillar mining; Coal mining; Coal mines; Structural analysis; Structural failure; Ground stability; Ground subsidence

19860101

IH; Information Circular

1986

IC 9072

TCRC

MISSING

IL; MN