Improved strata control through planning of coalwinning and support operations
As strata pressure calculations are vital in the planning of layout and support, this research work aimed to improve the mathematical modelling techniques currently used in German underground hard-coal workings. An isobar-plotting program was developed enabling strata pressures to be charted for any desired plane in the mine. The program can be used to identify zones of low strata pressure for heading intended workings and to represent visually differences in patterns of strata pressure exhibited by different situations in workings. It was particularly important to develop further the basis for calculations using the mathematical strata-pressure model, in order to obtain more accurate values for strata pressure at the panel edges and in neighbouring destressed zones, and in order to take into account the time factor while strata pressure is reestablished in the gob. Thus emphasis was placed on increasing the basic understanding of strata pressure distribution, based on research into strata movements above worked seam areas. From the values obtained, equations were developed with which to describe subsidence, compression and elongation of strata, enabling the patterns of strata pressure to be deduced.
Bibliographic Reference: EUR 13211 DE (1991) 102 pp., MF, ECU 8, blow-up copy ECU 13.75
Record Number: 199110460 / Last updated on: 1994-12-02
Original language: de
Available languages: de