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Subsidence Due to Underground Mining (In Two Parts). 2. Ground Movements and Mining Damage.

Authors
Braeuner-G
Source
NTIS: PB 220 496 :53 pages
Link
NIOSHTIC No.
10000958
Abstract
The present knowledge on ground movements and mining damage is mainly based on observations made when mining seamlike deposits. The studies, rules, and regulations in different countries agree in that the differential ground movements, especially the strain, account for the damage to structures. Accordingly, large buildings are particularly susceptible. The opinions on what amount of ground deformation induces what degree of structural damage are not quite uniform. Mining damage can be reduced or prevented by structural and/or underground precautions. The latter comprise measures for generally reducing the ground movements (leaving pillars, filling, partial extraction) and for reducing temporary movements (rapid extraction, specially arranged workings). Because the differential movements decrease with increasing depth of mining, safety pillars are largely dispensable at greater depths. Shafts are mainly affected by the vertical derivatives of rock displacements, but extraction in the vicinity of shafts is feasible even under difficult conditions. The theoretical concept of the ground movement process established in part 1 of this work is in qualitative agreement with the facts herein observed. As a quantitative approach, it should be applied to calculating ground surface movements rather than rock movements about underground openings. It can be extended by introducing more detailed strata characteristics.
Publication Date
19730101
Document Type
IH; Information Circular;
Fiscal Year
1973
NTIS Accession No.
PB-220496
NTIS Price
A05
Identifying No.
IC 8572
NIOSH Division
DRC;
Source Name
NTIS: PB 220 496
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