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Preliminary predictive model of subsidence process over room and pillar workings. Phase I: definition of factors.

Mathur SK; Mikkilineni MR

NTIS: PB/83-191759, 1982; :1-113

https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/PB83191759.xhtml

10002844

The 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.

Room and pillar mining; Mining; Underground mines; Subsidence; Structural analysis; Structural failure; Roof falls; Environmental stress; Failure analysis

19820101

CP; Final Contract Report

Contract

1982

PB83-191759

A07

OFR 68-83

PRC

NTIS: PB/83-191759

PA

Mrm Engineers