Influence of canopy ratio of powered roof support on longwall working stability – A case study

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scopus – master journals – JCR

ایمپکت فاکتور

۴٫۲۷۶ در سال ۲۰۲۰

شاخص H_index

۲۶ در سال ۲۰۲۱

شاخص SJR

۰٫۹۰۱ در سال ۲۰۲۰

شاخص Quartile (چارک)

Q1 در سال ۲۰۲۰

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Influence of canopy ratio of powered roof support on longwall working stability – A case study

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Influence of canopy ratio of powered roof support on longwall working stability – A case study


The case study describes longwall coal  seam A in a hard coal  mine, where longwall coal  face  stability loss and periodic roof  fall  occurrences had been registered. The  authors have attempted to explain the situa- tion based on  in-situ measurements and observations of the longwall working as well as numerical sim- ulation. The  calculations included several parameters, such as  powered roof  support geometry in  the form  of   the  canopy ratio,  which  is   a   factor  that  influences load  distribution  along  the  canopy. Numerical simulations were realized based on  a rock mass model representing realistic mining and geo- logical conditions at a depth of 600 m  below surface for  coal  seam A. Numerical model assumptions are described, while the obtained results were compared with the in-situ measurements. The  conclusions drawn from this work can  complement engineering knowledge utilized at the stage of powered roof  sup- port construction and selection in order to improve both personnel safety and longwall working stability, and to achieve better extraction.

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  1. Introduction

The safe  and effective mining of coal  seams is inseparably con- nected  with  maintaining  the  original mine  working geometry despite the load  applied by the rock mass. Adverse mining and geo- logical conditions while operating at great depths  considerably contribute to the occurrence of damage events due to loss of stabil- ity  [۱,۲].  Mine  working stability is determined by  several factors, which are  dependent primarily on the natural and technical condi- tions of the conducted mining operations [3].  Liu et al. found the internal factors between mining heights and shield resistance as well  as surrounding rocks in order to  determine the stability con- ditions of overburden based on  the numerical simulation [4]. Li el al. studied the stability of the roof structure and hydraulic supports with physical simulation and theoretical analysis [5]. Prusek et al. analyzed and described typical damage to support of the workings, resulting from dynamic load,  illustrated with numerical simula- tion, as well  as determined the major factors influencing the stabil- ity  of the roof  in  retreat longwall panels [3,6].  Also  Prusek et al. studied the interaction between shield and roof  strata in two long- wall  panels with natural roof caving in the gob using the concept of ground  reaction  curves  (GRCs)   in   order  to   determine  shield

capacity [1]. Hu et al. studied the effects of strike angle on support stability and analyzed influencing factors of support stability and the technical measures of  controlling support  and surrounding rock  stability [7].

One   of  the  significant technical factors influencing longwall working stability is  the dimensions and geometrical parameters of the powered support. An unfavourable geometric configuration of the powered roof  support, may result in  a situation where the powered support does not  sufficiently interact with surrounding mass rock.  Important technical parameters ensuring that the bal- ance of  mass forces originating from the surrounding rock  mass is maintained include uniform distribution of pressure (active sup- port) along the entire length of the canopy [6].  Load  distribution can  be  achieved on  condition that the position of  the resultant force  is  within approximately 1/3  the length, L,  from the end of the canopy, as shown in Fig. 1 [8].

Achieving  a  hydraulic  leg   socket  distance  (resultant  force– Fig. 1) in relation to the end of the canopy at a proportion of max- imum of  ۲٫۶:۱ constitutes the optimal powered support canopy ratio value [9–۱۱]. In order to  demonstrate the importance of the powered support canopy ratio and its  influence on  the longwall working stability, a  series of  numerical simulations were per- formed. Various dimensions and geometrical parameters  of  the support were used for  this purpose, one  of which was  character- ized   by  a  favourable and unfavourable geometric configuration.

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