首页|Calibrating Numerical Model for Room-and-Pillar Coal Mining Simulation in Weak Immediate Roof Based on In-situ Tests
Calibrating Numerical Model for Room-and-Pillar Coal Mining Simulation in Weak Immediate Roof Based on In-situ Tests
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It is a very difficult task to estimate the immediate roof and support behavior in a room-and-pillar mining section in the initial phase of the mining project。 There is little information available at this phase， and it is restricted to geomechanic characterization of the rock layers from cores samples， and the in-situ instrumentation of experimental entries and intersections。 Even being a pilot excavation for roof support test a good indicator for the behavior of the immediate roof， its behavior for a full excavation mining section is different from a single intersection of two entries， mainly because the stress redistribution caused by the multiple entries excavation and face advance for a full excavation section。 The objective of this paper was to calibrate a 3-D numerical model of an experimental intersection， based on the in-situ instrumentation of an experimental intersection excavation， and the geomechanic description of the rock layers。 The numerical model was built with the same specifications as the excavation test， including the entry geometry and roof support。 The numerical model calibration was based on wire extensometers that were installed at different positions in the roof of the pilot excavation， and on the geomechanic characterization of the rock layers that form the roof， coal seam， and floor。 Therefore， it is possible to estimate whether the roof support specification adopted in the test phase will be good enough for the development of the entire mining section。
Andre C. Zingano、Cleber Gomes、Jair C. Koppe、Joao Felipe Costa
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Dept. of Mining Engineering University Federal of Rio Grande do Sul Porto Alegre, Brazil
Research Dept. SIECESC Cricuima, Brazil
Dept. of Mining Eng. University Federal of Rio Grande do Sul Porto Alegre, Brazil
International conference on ground control in mining;ICGCM
Morgantown, WV(US);Morgantown, WV(US)
28th international conference on ground control in mining
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