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Investigating different methods used for approximating pillar loads in longwall coal mines

International Journal of Mining Science and Technology 2021年第1期31卷 23-32页

作者： deniz tuncay a Ihsan Berk Tulu a Ted Klemetti Department of Mining Engineering West Virginia UniversityMorgantown 26501USA NIOSH Pittsburgh Mining Research Division Pittsburgh 15236USA

Accurately estimating load distributions and ground responses around underground openings play a significant role in the safety of the operations in underground *** designing pillars and other support measures relies highly on the accurate assessment of the loads that will be carried by them,as well as the load-bearing capacities of the *** are various methods that can be used to approximate mining-induced loads in stratified rock masses to be used in pillar *** empirical methods are based on equations derived from large databases of various case *** are implemented in government approved design tools and are widely *** are also analytical and numerical techniques used for more detailed analysis of the induced *** this study,two different longwall mines with different panel width-to-depth ratios are analyzed using different *** empirical method used in the analysis is the square-decay stress function that uses the abutment angle concept,implemented in pillar design software developed by the National Institute for Occupational Safety and Health(NIOSH).The first numerical method used in the analysis is a displacement-discontinuity(DD)variation of the boundary element method,LaModel,which utilizes the laminated overburden *** second numerical method used in the analysis is Fast Lagrangian Analysis of Continua(FLAC)with the numerical modeling approach recently developed at West Virginia University which is based on the approach developed by *** model includes the 2D slice of a cross-section along the width of the panel with the chain pillar system that also includes the different stratigraphic layers of the *** three methods gave similar results for the shallow mine,both in terms of load percentages and distribution where the variation was more obvious for the deep cover *** FLAC3D model was observed to better capture the stress changes observed during the field measurements for both

关键词： Abutment loads Numerical modeling LaModel FLAC3D Longwall coal mines

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Analysis of ARMPS2010 database with LaModel and an updated abutment angle equation

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International Journal of Mining Science and Technology 2020年第1期30卷 111-118页

作者： deniz tuncay Ihsan Berk Tulu Ted Klemetti Department of Mining Engineering West Virginia UniversityMorgantownWV 26505USA National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

The Analysis of Retreat Mining Pillar Stability(ARMPS) program was developed by the National Institute for Occupational Safety and Health(NIOSH) to help the United States coal mining industry to design safe retreat room-and-pillar panels. ARMPS calculates the magnitude of the in-situ and mining-induced loads by using geometrical computations and empirical rules. In particular, the program uses the "abutment angle" concept in calculating the magnitude of the abutment load on pillars adjacent to a gob. In this paper, stress measurements from United States and Australian mines with different overburden geologies with varying hard rock percentages were back analyzed. The results of the analyses indicated that for depths less than 200 m, the ARMPS empirical derivation of a 21° abutment angle was supported by the case histories;however, at depths greater than 200 m, the abutment angle was found to be significantly less than 21°. In this paper, a new equation employing the panel width to overburden depth ratio is constructed for the calculation of accurate abutment angles for deeper mining cases. The new abutment angle equation was tested using both ARMPS2010 and La Model for the entire case history database of ARMPS2010. The new abutment angle equation to estimate the magnitude of the mining-induced loads used together with the La Model program was found to give good classification accuracies compared to ARMPS2010 for deep cover cases.

关键词： Abutment angle ARMPS2010 LaModel ARMPS-LAM Coal mining Pillar stability

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