GEOTECHNICAL PROCESSES IN CLOSED OIL SHALE MINES
2003; Estonian Academy Publishers; Volume: 20; Issue: 3S Linguagem: Inglês
10.3176/oil.2003.3s.14
ISSN1736-7492
Autores Tópico(s)Tunneling and Rock Mechanics
ResumoDuring the years 1998-2001 geotechnical processes in closed underground oil shale mines and opencasts were investigated.In addition to kukersite oil shale deposit, the closed Sillamäe uranium (Dictyonema shale) mine was prospected.The main tools and methods included mine plans, aerial photographs and Geographical Information System data.290 km 2 of underground and 130 km 2 of strip-mined areas were studied.The mining maps of Estonian underground and surface mines were created.The stability of underground mined area, where room-and-pillar method was used, was the main objective of the study.It was studied with the help of aerial photographs, mine drawings, maps of quaternary sediments and mathematical modeling of rock failure.The main results are: 20 % of subsidences remain undiscovered and 42 % of subsidence occurrences have no remarkable influence to the land cover; the probability of subsidence remains and may increase in the case of mine drowning.As several mines will be closed during the next few years, the problems of drowned waste (which were not subjects of this study) are going to be more actual than before: increasing underground water level, pollution of underground water, formation of technogenic water sources, overflooding of reclaimed areas, etc.
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