Abstract
An investigation was undertaken by the Indiana Division of Reclamation (DOR) on behalf of the Indiana Department of Insurance (DOI) to determine if mine subsidence due to old underground works was resulting in structural damage to a residential structure in Alfordsville, Indiana. The owner had alleged that subsidence was causing damage to the structure and had filed a claim under the Indiana Mine Subsidence Insurance Fund. Previous reports that addressed the damage to the owner`s house and their possible causes are summarized. Core drilling, gamma logs, borehole TV camera observations, and elevation surveys indicated no evidence of mine workings in the two coal seams present below the owner`s house. The rock cores showed no signs of disturbance that would be expected if a mine collapse had occurred at shallow depth and progressed to the surface. The gamma logs were in agreement with core descriptions. Elevation measurements of points on the house indicated a continuing differential settlement of the house; surface elevation measurements in the vicinity of the house did not exhibit such a consistent trend. It is the authors` opinion that the observed indications of continuing differential settlement are due to local soil conditions and non-engineered construction modifications without regardmore » to subsoil conditions.« less
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