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PB83191759

Publication Date	1982
Personal Author	Mathur, S. K.; Mikkilineni, M. R.
Page Count	119
Abstract	This report identifies all the possible activities, variables, and factors that contribute to the surface subsidence process over room-and-pillar workings. These factors are responsible for mine instability and collapse that ultimately transforms into surface subsidence. Such a failure mechanism is initiated by the failure of the mine floor bed and/or the failure of the pillars or the failure of the roof after second mining, which eventually brings down the roof. The individual responses of the pillar, floor, and roof rocks to the mining induced stresses and the complex interaction between these components cannot be attributable to any single factor. Also, no attempt has been made to quantify the significance of each of these factors and relate to the ground subsidence due to the lack of field data. The discussion here is centered primarily on the first mining although second mining is mentioned very briefly.
Keywords	Coal mining Room and pillar mining Underground supporting Subsidence Geologic processes Water influx Mine safety
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	MRM Engineers, Pittsburgh, PA.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. Jan 81-Apr 82.
NTIS Issue Number	198315
Contract Number	J01000073

Preliminary Predictive Model of Subsidence Process over Room and Pillar Workings. Phase I. Definition of Factors.

Preliminary Predictive Model of Subsidence Process over Room and Pillar Workings. Phase I. Definition of Factors.
PB83191759

Publication Date	1982
Personal Author	Mathur, S. K.; Mikkilineni, M. R.
Page Count	119
Abstract	This report identifies all the possible activities, variables, and factors that contribute to the surface subsidence process over room-and-pillar workings. These factors are responsible for mine instability and collapse that ultimately transforms into surface subsidence. Such a failure mechanism is initiated by the failure of the mine floor bed and/or the failure of the pillars or the failure of the roof after second mining, which eventually brings down the roof. The individual responses of the pillar, floor, and roof rocks to the mining induced stresses and the complex interaction between these components cannot be attributable to any single factor. Also, no attempt has been made to quantify the significance of each of these factors and relate to the ground subsidence due to the lack of field data. The discussion here is centered primarily on the first mining although second mining is mentioned very briefly.
Keywords	Coal mining Room and pillar mining Underground supporting Subsidence Geologic processes Water influx Mine safety
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	MRM Engineers, Pittsburgh, PA.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. Jan 81-Apr 82.
NTIS Issue Number	198315
Contract Number	J01000073