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Subsidence Over a Room-and-Pillar Coal Panel in Southern West Virginia.

PB84220177

Publication Date	1983
Personal Author	Jones, T. Z.; Kohli, K. K.
Page Count	77
Abstract	This study was sponsored by the Bureau of Mines as part of its on-going subsidence research program. The study involved installation of surface survey monuments over a room-and-pillar panel in southern West Virginia, eastern coal province. Monitoring was conducted for a period of 6 months. Maximum subsidence was 1.48 ft and occurred near the center of a two-panel span, one of which was monitored as part of the study and the other adjacent to it. This is equal to 31 pct of the extracted coal height. The angle of draw over the pillared panels was 24 degrees. The width-to-depth ratio over the pillared panels was 0.85. A maximum surface horizontal strain of 0.003 was detected near the center of the monitored panel. The overburden lithology consists of interlayered sandstone, shales, and coal with 50 pct of the overburden being sandstone layers 5 ft thick or greater.
Keywords	Subsidence Underground mining Coal mining Monitoring Strains Overburden Lithology Sandstones Shales Coal Stratigraphy Slope West Virginia Tables(Data) Room and pillar mining
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	West Virginia Inst. of Tech., Montgomery. Div. of Mining.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. 7 May 82-28 Oct 83.
NTIS Issue Number	198422
Contract Number	J0328010

Subsidence Over a Room-and-Pillar Coal Panel in Southern West Virginia.

Subsidence Over a Room-and-Pillar Coal Panel in Southern West Virginia.
PB84220177

Publication Date	1983
Personal Author	Jones, T. Z.; Kohli, K. K.
Page Count	77
Abstract	This study was sponsored by the Bureau of Mines as part of its on-going subsidence research program. The study involved installation of surface survey monuments over a room-and-pillar panel in southern West Virginia, eastern coal province. Monitoring was conducted for a period of 6 months. Maximum subsidence was 1.48 ft and occurred near the center of a two-panel span, one of which was monitored as part of the study and the other adjacent to it. This is equal to 31 pct of the extracted coal height. The angle of draw over the pillared panels was 24 degrees. The width-to-depth ratio over the pillared panels was 0.85. A maximum surface horizontal strain of 0.003 was detected near the center of the monitored panel. The overburden lithology consists of interlayered sandstone, shales, and coal with 50 pct of the overburden being sandstone layers 5 ft thick or greater.
Keywords	Subsidence Underground mining Coal mining Monitoring Strains Overburden Lithology Sandstones Shales Coal Stratigraphy Slope West Virginia Tables(Data) Room and pillar mining
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	West Virginia Inst. of Tech., Montgomery. Div. of Mining.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. 7 May 82-28 Oct 83.
NTIS Issue Number	198422
Contract Number	J0328010