Advertisement

Life cycle analysis and damage prediction of a longwall powered support using 3D numerical modelling techniques

  • Sreenivasa Rao IslavathEmail author
  • Debasis Deb
  • Hemant Kumar
Original Paper
  • 45 Downloads

Abstract

Powered shield support consists of structural members like hydraulic legs, canopy, base, goaf shield, lemniscate links and several pins connecting these members. All these members experience cyclic loading as the shearer cuts coal and the longwall face advances. During the operational life of a shield support, members may be damaged since loading conditions vary widely depending on the type of roof and floor strata. This study focuses on the analysis of responses of various members of a powered support in terms of stresses, minimum number of operational loading cycles for a given safety factor and the damage under cyclic loading conditions. Three-dimensional finite element models of a longwall panel are firstly analysed having powered support, rock strata, coal seam and goaf to determine the typical loading patterns those may occur on top of the canopy. Then these loading patterns are applied on a digital twin shield structure as cyclic loads for estimation of fatigue responses of various members. The study reveals that the most effected zone of the entire shield structure lies in goaf shield between the connectors of two lemniscate links. The links are the major load-bearing members and hence, their connection with the base and pins are severely also affected due to cyclic loading.

Keywords

Powered support Cyclic load Fatigue failure Operational life Safety factor and damage 

Notes

Acknowledgments

The authors would like to thank the management of the Singareni Collieries Company Limited (SCCL) of Telangana state, India, for allowing to visit the mine and to collect the relevant data for this study.

References

  1. ANSYS (2009) Manual Release version 12.0.1. ANSYS Inc.Google Scholar
  2. Bae JH, Kim MS, Song MJ, Jung SY, Kim C (2011) A study on optimal design and fatigue life of the common rail pipe. Int J Precis Eng Manuf 12(3):475–483CrossRefGoogle Scholar
  3. Barczak TM, Gearhart DF (1992) Canopy and base load distribution on a longwall shield. United States Bureau Mines (USBM) RI 9418:2–22Google Scholar
  4. Deb D (1997) Longwall strata control and maintenance system (LoSCoMS). PhD thesis. University of Alabama, TuscaloosaGoogle Scholar
  5. Deb D (2000) Analysis of real time shield pressures for the evaluation of longwall ground control problems. J Mines Met Fuels 48:230–236Google Scholar
  6. Gao Y, Zhao T (2014) Statics analysis and fatigue analysis on double telescopic column of hydraulic support. Mech Eng Design 3(2):6–12Google Scholar
  7. Islavath SR (2018) Stability of longwall face vis-a-vis performance and structural analysis of powered support. PhD thesis. In: Indian Institute of Technology. (Indian School of Mines) Dhanbad, IndiaGoogle Scholar
  8. Islavath SR, Deb D, Kumar H (2016) Numerical analysis of a longwall mining cycle and development of a composite longwall index. Int J Rock Mech Min Sci 89:43–54CrossRefGoogle Scholar
  9. Liu F, Zhou S, Xia S, Xia C, Zeng D, Shi T (2016) Optimization of fatigue life distribution model and establishment of probabilistic S-N curves for a 165 ksi grade super high strength drill pipe steel. J Pet Sci Eng 145:527–532CrossRefGoogle Scholar
  10. Rao VG, Talukdar S (2003) Prediction of a fatigue life of a continuous bridge girder based on vehicle induced stress history. Shock Vib 10:325–338CrossRefGoogle Scholar
  11. Ravichandran KS (2016) Physical model and constitutive equations for complete characterization of s-n fatigue behavior of metals. Acta Mater 121:85–103CrossRefGoogle Scholar
  12. Singh GSP, Singh UK (2010) Prediction of caving behavior of strata and optimum rating of hydraulic powered support for longwall workings. Int J Rock Mech Min Sci 47:1–16CrossRefGoogle Scholar
  13. Szurgacz D, Kasprusz A (2011) Selection of hydraulic leg of mechanized roof support for operation in hazardous conditions of mining tremors. Res Rep Min Environ 3:89–99Google Scholar
  14. Trueman LG, Cocker A (2009) Longwall roof control through a fundamental understanding of shield – strata interaction. Int J Rock Mech Min Sci 46:371–380CrossRefGoogle Scholar
  15. Verma AK, Deb D (2010) Longwall face stability index for estimation of chock-shield pressure and face convergence. Geotech Geol Eng 28(4):43–445CrossRefGoogle Scholar
  16. Verma AK, Deb D (2013) Numerical analysis of an interaction between hydraulic – powered support and surrounding rock strata. Int J Geomech 13:181–192CrossRefGoogle Scholar
  17. Witek M, Prusek S (2016) Numerical calculations of shield support stress based on laboratory test results. Comput Geotech 72:74–88CrossRefGoogle Scholar

Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Sreenivasa Rao Islavath
    • 1
    Email author
  • Debasis Deb
    • 2
  • Hemant Kumar
    • 3
  1. 1.Department of Mining Engineering, University College of EngineeringKakatiya UniversityKothagudemIndia
  2. 2.Department of Mining EngineeringIndian Institute of TechnologyKharagpurIndia
  3. 3.Department of Mining EngineeringIndian Institute of Technology (Indian School of Mines)DhanbadIndia

Personalised recommendations