Mechanisms of Subsidence Induced Damage and Techniques for Analysisby Eric C. Drumm, Univ of Tennessee, Knoxville, TN, USA,
Richard M. Bennett, Univ of Tennessee, Knoxville, TN, USA,
William F. Kane, Univ of Tennessee, Knoxville, TN, USA,
Abstract: Structural damage due to mining induced subsidence is a function of the nature of the structure and its position on the subsidence profile. A point on the profile may be in the tensile zone, the compressive zone, or the no-deformation zone at the bottom of the profile. Damage to structures in the tension zone is primarily due to a reduction of support during vertical displacement of the ground surface, and to shear stresses between the soil and structure resulting from horizontal displacements. The damage mechanisms due to tension can be investigated effectively using a two-dimensional plane stress analysis. Structures in the compression zone are subjected to positive moments in the footing and large compressive horizontal stresses in the foundation walls. A plane strain analysis of the foundation wall is utilized to examine compression zone damage mechanisms. The structural aspects affecting each mechanism are identified and potential mitigation techniques are summarized.
Subject Headings: Stress analysis | Land subsidence | Soil analysis | Damage (structural) | Compression | Shear stress | Soil stress | Soil structures
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