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Mechanical behaviors of deep pillar sandwiched between strong and weak layers

Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1111-1126页

作者： Sahendra Ram Petr Waclawik Jan Nemcik Radovan Kukutsch Ashok Kumar Arun Kumar Singh Libin Gong Department of Mining Engineering National Institute of TechnologyRourkelaOdishaIndia Institute of Geonics The Czech Academy of SciencesOstravaCzech Republic University of Wollongong WollongongAustralia CSIR-Central Institute of Mining and Fuel Research DhanbadJharkhandIndia Department of Mining Engineering Indian Institute of Technology(Indian School of Mines)DhanbadJharkhandIndia

A variety of coal room and pillar mining methods have been efficiently practiced at depths of up to 500 m with least strata mechanics ***,for the first time,this method was trialled at depths of 850 e900 m in CSM mine of Czech *** rhomboid-shaped coal pillars with acute corners of 70,surrounded with 5.2 m wide and 3.5e4.5 m high mine roadways,were *** were developed in a staggered manner with their size variation in the Panel II from 83 m×25 m to 24 m×20 m(corner to corner)and Panel V from 35 m×30 m to 26 m×16 *** seam inclined at 12was affected by the unusual slippery slickenside roof bands and sometimes in the floor levels with high vertical stress below strong and massive sandstone *** order to ensure safety,pillars in both the panels were continuously monitored using various geotechnical instruments measuring the induced stresses,side spalling and roof *** panels suffered high amounts of mining induced stress and pillar failure with side-spalling up to 5 m from all *** fracturing of coal pillar sides was controlled by fully encapsulated steel *** induced stress kept increasing with the progress of development of pillars and *** installed in the pillar failed to monitor actual induced stress due to fracturing of coal mass around it which created an apprehension of pillar failure up to its core due to high vertical mining induced *** risk was reduced by carrying out scientific studies including the three-dimensional numerical models calibrated with data from the instrumented *** attempt has been made to study the behavior of coal pillars and their yielding characteristics at deeper cover based on field and simulation results.

关键词： Pillar yielding mechanisms Great depth Numerical modeling induced stress Pillar dilation Slippery slickenside layer

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