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Subsidence monitoring at a shallow partial extraction room-and-pillar mine in midwestem United State
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Citation (Style = APA)
Chugh, Yoginder P. (1989). Subsidence monitoring at a shallow partial extraction room-and-pillar mine in midwestem United State. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
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Chugh, Yoginder P. (1989). Subsidence monitoring at a shallow partial extraction room-and-pillar mine in midwestem United State. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
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Reference Manager (RIS)
SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 8
Publication Date:
Jan 1, 1989
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Abstract
Abstract
| Subsidence may be observed above partial extraction shallow room-and-pillar mines where the coal seam(s) is associated with weak and thick claystone in the floor. This paper presents results of subsidence studies at such a mine. During the 26-month study period, a time dependent subsidence causing a maximum vertical movement of 50 mn was observed. After a subsidence rate of 6.0-6.5 m/month for the first two months after development of mine workings, the rate decreased to 0.8-0.9 mm/month after 17 months. However, presumably due to settlement of barrier pillars, it increased therafter to 1.7 mm/month for the next 9 months. Angle of draw, based on zero subsidence, was calculated to be about 29 degrees. Maximum tensile strain and compressive strain values observed were 0.040 pct and 0.039 pct respectively. A hypothesis was fomlated to correlate surface subsidence movements with observed underground movments. The data collected to date fits reasonably well within the formulated hypothesis. |
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