Estimation of First and Periodic Roof Weighting Effect Interval in Mechanized Longwall Mining Using Numerical Modeling
Publication: International Journal of Geomechanics
Volume 20, Issue 2
Abstract
The main factors that make longwall mining projects economical are roof control and prediction of roof behavior in roof caving and face advance. Sudden and unexpected roof fall not only endangers the safety of employees but also destroys and damages the extraction equipment and components. In addition, there are financial and economic impacts because the extraction operation is interrupted. Therefore, determining the first roof weighting effect interval (FRWEI) and the periodic roof weighting effect interval (PRWEI) are very important in longwall mining. There are several methods to determine the FRWEI and PRWEI. This paper investigated the behavior of steep layers during the roof caving process in the gob space by numerical modeling, and then estimated the value of the FRWEI and PRWEI at the E3 panel of the Tabas Parvadeh coal mine. The roof failure criterion was based on the Sakurai equations. According to the numerical modeling results, the FRWEI value is 11 m and the PRWEI value is between 2.5 and 4.5 m.
Get full access to this article
View all available purchase options and get full access to this article.
References
Ataei, M. 2015. Underground caving method. Shahroud, Iran: Shahrood Univ. of Technology.
Chuang, L., L. Huamin, and J. Dongjie. 2017. “Numerical simulation study on the relationship between mining heights and shield resistance in longwall panel.” Int. J. Min. Sci. Technol. 27 (2): 293–297. https://doi.org/10.1016/j.ijmst.2017.01.017.
Das, S. K. 2000. “Observations and classification of roof strata behaviour over longwall coal mining panels in India.” Int. J. Rock Mech. Min. Sci. 37 (4): 585–597. https://doi.org/10.1016/S1365-1609(99)00123-9.
Hosseini, N. G., B. K. Oraee-Mirzamani, and M. Gholinejad. 2013. “Calculation of periodic roof weighting interval in longwall mining using finite element method.” Arabian J. Geosci. 7 (5): 1951–1956. https://doi.org/10.1007/s12517-013-0859-8.
Kwasniewski, M. 2008. “Numerical analysis of strata behavior in the vicinity of a longwall panel in a coal seam mined with roof caving.” In Proc., 1st Int. FLAC/DEM Symposium: Continuum and Distinct Element Numerical Modelling in Geo-Engineering, 7–8. Minneapolis: Itasca Consulting Group.
Majdi, A., F. Hasani, and M. Y. Nasiri. 2012. “Prediction of the height of destressed zone above the mined panel roof in longwall coal mining.” Int. J. Coal Geol. 98: 62–72. https://doi.org/10.1016/j.coal.2012.04.005.
Mangal, A., and P. S. Paul. 2016. “Rock mechanical investigation of strata loading characteristics to assess caving and requirement of support resistance in a mechanized powered support longwall face.” Int. J. Min. Sci. Technol. 26 (6): 1081–1087. https://doi.org/10.1016/j.ijmst.2016.09.017.
Najafi, M., A. H. Shishebori, and J. Gholamnejad. 2016. “Numerical estimation of suitable distance between two adjacent panels’ working faces in short wall mining.” Int. J. Geomech. 17 (4): 04016090. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000784.
Noroozi, A., K. Oraee, M. Javadi, K. Goshtasbi, and H. Khodadady. 2012. “A model for determining the breaking characteristics of immediate roof in longwall mines.” Yerbilimleri Dergisi 33 (2): 193–203.
Oraee, K., and M. Rostami. 2008. “Qualitative and quantitative analysis of hangingwall caving in longwall mining method using a fuzzy system.” In Proc., 21st World Mining Congress and Expo 2008. Krakow, Poland.
Osouli, A., and B. Moradi. 2015. “Geomechanical properties of coal mine roof rocks in Illinois.” In Proc., IFCEE. Reston, VA: ASCE.
Peng, S. S. 1986. Coal mine ground control. 2nd ed. New York: Wiley.
Peng, S. S. 1987. “Support capacity and roof behavior at longwall face with shield support.” Int. J. Min. Geol. Eng. 5 (1): 29–57. https://doi.org/10.1007/BF01553531.
Peng, S. S., and H. S. Chiang. 1984. Longwall mining, 708. New York: Wiley.
Rezaei, M., M. F. Hossaini, and A. Majdi. 2015. “A time-independent energy model to determine the height of destressed zone above the mined panel in longwall coal mining.” Tunnelling Underground Space Technol. 47 (Mar): 81–92. https://doi.org/10.1016/j.tust.2015.01.001.
Richardson, A. M., L. J. Gilbride, and J. F. T. Agapito. 1998. “A study of periodic weighting of longwall supports.” In Proc., 17th Conf. on Ground Control in Mining, 4–6. Morgantown, WV.
Sakurai, S. 1997. “Lessons learned from field measurements in tunnelling.” Tunnelling Underground Space Technol. 12 (4): 453–460. https://doi.org/10.1016/S0886-7798(98)00004-2.
Shabanimashcool, M., L. Jing, and C. C. Li. 2014. “Discontinuous modelling of stratum cave-in in a longwall coal mine in the arctic area.” Geotech. Geol. Eng. 32 (5): 1239–1252. https://doi.org/10.1007/s10706-014-9795-y.
Shabanimashcool, M., and C. C. Li. 2012. “Numerical modelling of longwall mining and stability analysis of the gates in a coal mine.” Int. J. Rock Mech. Min. Sci. 51 (Apr): 24–34. https://doi.org/10.1016/j.ijrmms.2012.02.002.
Singh, G. S. P., and U. K. Singh. 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): 1–16. https://doi.org/10.1016/j.ijrmms.2009.09.001.
TPC (Tabas Parvadeh Coal). 2005. Basic design of Tabas coal mine project. Tabas, South: TPC.
Trueman, R., R. Thomas, and D. Hoyer. 2011. “Understanding the causes of roof control problems on a longwall face from shield monitoring data—A case study.” In Proc., 11th Underground Coal Operators’ Conf., 40–47. Wollongong, NSW, Australia: Univ. of Wollongong and Australasian Institute of Mining and Metallurgy.
Wang, K. 2011. “Study of reasonable hanging roof length on hard roof.” Procedia Eng. 15 (Jan): 772–776. https://doi.org/10.1016/j.proeng.2011.08.144.
Wang, S., and X. Li. 2016. “Dynamic distribution of longwall mining-induced voids in overlying strata of a coal bed.” Int. J. Geomech. 17 (6): 04016124. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000820.
Zhang, G. C., Y. L. Tan, S. J. Liang, and H. G. Jia. 2018a. “Numerical estimation of suitable gob-side filling wall width in a highly gassy longwall mining panel.” Int. J. Geomech. 18 (8): 04018091. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001217.
Zhang, K., T. Yang, H. Bai, and R. Pathegama Gamage. 2018b. “Longwall mining–induced damage and fractures: Field measurements and simulation using FDM and DEM coupled method.” Int. J. Geomech. 18 (1): 04017127. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001040.
Information & Authors
Information
Published In
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 7, 2019
Accepted: May 16, 2019
Published online: Dec 7, 2019
Published in print: Feb 1, 2020
Discussion open until: May 7, 2020
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.