Subsidence Damaged Homes Over Room and Pillar Mines in Illinois (Ground Movements, Damage Criteria)
Marino, Gennaro Gerald
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https://hdl.handle.net/2142/69948
Description
Title
Subsidence Damaged Homes Over Room and Pillar Mines in Illinois (Ground Movements, Damage Criteria)
Author(s)
Marino, Gennaro Gerald
Issue Date
1985
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Geotechnology
Abstract
In this thesis a relationship is established between residential damage and ground movements over Illinois room and pillar mines. Using this ground movement-damage criterion and knowing the expected level of ground displacement house damage can be estimated. Subsidence characteristics observed at the ground surface over Illinois room and pillar mines are presented for estimating ground movement for damage prediction.
Thesis objectives were achieved through information acquired from a review of the literature and from case data. The subsidence information collected was over room and pillar mines 110 to 250 ft deep. Sags refer to the subsidence events over the room and pillar workings and are bowl- or dish-shaped depressions typically up to 4 ft deep and up to 1,000 ft in diameter. The house cases had ratios of house length to sag diameter of 0.05 to 0.25.
House damage was quantified by developing a damage classification system with five damage intensities where a description of the damage and associated repairs was given at each intensity. Damage levels were defined by the relative repair cost, RRC. The RRC was defined as the ratio of the total repair cost of the house to the house replacement cost.
The ground movement-damage criteria were established by estimating subsidence profile characteristics adjacent to the case houses and relating them to the RRC values for the houses. Both angular distortion and the average slope of the subsidence profile adjacent to the homes were used in the criteria. The angular distortion was measured as the maximum vertical displacement at either end of the house from a tangent to the subsidence profile divided by one half the house length, where the tangent was taken on the profile at the house mid-point. The magnitude of lateral strain of the ground movements could not be included in these criteria because insufficient data was available. For the range of conditions of the case data it was assumed that the strain effects were implicitly included in the profile angular distortion. A ground movement-damage criterion was established separately for houses on crawl-space and on basement foundation.
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