nach oben

Bulletin of Engineering Geology and the Environment

Erschienen in:

01.04.2023 | Original Paper

Drawing mechanisms of granular top coal considering the structure of hydraulic support in longwall top coal caving

verfasst von: Weijie Wei, Jiachen Wang, Jinwang Zhang, Shanxi Wu, Zheng Li, Xiangyang Zhang

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 4/2023

Einloggen

Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.

search-config

KI-gestützte Suche

Aus

Abstract

Drawing support is one of the unique equipment for longwall top coal caving (LTCC) technology in coal mine, whose structure has a significant effect on the top coal drawing mechanism. This research systemically investigates the effect of the dip angle of shield beam (α), length ratio of shield beam to tail beam (R_L), and rotation angle of tail beam (β) on the top coal recovery, drawing body and top coal boundary by using particle flow code (PFC^2D). The results show that the variation of α and β has a greater effect on the top coal drawing mechanism, the ideal α should be about 55°, R_L is within the range of 0.8–1.0, and the tail beam rotates at a small angle range, which is beneficial to the top coal drawing in the panel. When α is large while R_L is small, the volume of the initial drawing body gradually increases. With the increase of drawing height, volumes of drawing body under different β all plot an increasing trend with an incremental growth ratio. With increasing R_L, the initial top coal boundary on the goaf side experiences the change of “upward concave-nearly linear-upward concave”, while that on the support side shows a curve with a fast-changing slope and closes to the vertical central line of drawing opening. The research results have important theoretical and field guiding significance for the selection and design of hydraulic support in LTCC.

Vorheriger Artikel Numerical modeling and damage evolution research on the effect of joint geometrical parameters in nonpersistent jointed rock masses

Nächster Artikel Evaluation of dynamic behavior by linear equivalent analysis of North Batman, Turkey

Sie haben noch keine Lizenz? Dann Informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

über 67.000 Bücher
über 390 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Maschinenbau + Werkstoffe

Jetzt Wissensvorsprung sichern!

Jetzt informieren

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

über 102.000 Bücher
über 537 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Finance + Banking
Management + Führung
Marketing + Vertrieb
Maschinenbau + Werkstoffe
Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

Jetzt informieren

Alehossein H, Poulsen BA (2010) Stress analysis of longwall top coal caving. Int J Rock Mech Min Sci 47(1):30–41. https://doi.org/10.1016/j.ijrmms.2009.07.004CrossRef

Çelik A, Özçelik Y (2021) Investigation of the efficiency of longwall top coal caving method applied by forming a face in horizontal thickness of the seam in steeply inclined thick coal seams by using a physical model. Int J Rock Mech Min Sci 148:104917

Fu Q, Yan SH, Wu J (2002) Theoretical research on loose top-coal drawing of longwall sublevel caving mining. Chin J Rock Mech Eng 4:568–572

Gao YJ (2004) Design and stress analysis of hydraulic support with high drawing opening. China Coal 9:33–35, 37, 4. https://doi.org/10.19880/j.cnki.ccm.2004.09.012

Ghosh AK, Gong Y (2014) Improving coal recovery from longwall top coal caving. J Mines Met Fuels 62(3):51–57. http://hdl.handle.net/20.500.11937/43218

He Z, Xie H, Gao M et al (2021) The fracturing models of hard roofs and spatiotemporal law of mining-induced stress in a top coal caving face with an extra-thick coal seam. Geomech Geophys Geo-Energ Geo-Resour 7:2. https://doi.org/10.1007/s40948-020-00202-9CrossRef

Jangara H, Ozturk CA (2021) Longwall top coal caving design for thick coal seam in very poor strength surrounding strata. Int J Coal Sci Technol 8:641–658

Khanal M, Adhikary D, Balusu R (2011) Evaluation of mine scale longwall top coal caving parameters using continuum analysis. Min Sci Technol (China) 21(6):787–796

Khanal M, Adhikary D, Balusu R (2014) Prefeasibility study-geotechnical studies for introducing longwall top coal caving in Indian mines. J Min Sci 50:719–732. https://doi.org/10.1134/S1062739114040139CrossRef

Klishin VI, Fryanov VN, Pavlova LD et al (2019) Modeling top coal disintegration in thick seams in longwall top coal caving. J Min Sci 55:247–256. https://doi.org/10.1134/S1062739119025527CrossRef

Le TD, Oh J, Hebblewhite B et al (2018) A discontinuum modelling approach for investigation of longwall top coal caving mechanisms. Int J Rock Mech Min Sci 106:84–95

Le TD, Zhang CG, Oh J et al (2019) A new cavability assessment for longwall top coal caving from discontinuum numerical analysis. Int J Rock Mech Min Sci 115:11–20

Le, TD, Bui XN (2020) Effect of key parameters on top coal first caving and roof first weighting in longwall top coal caving: a case study. Int J Geomech 20(5):04020037

Melo F, Vivanco F, Fuentes C et al (2008) Kinematic model for quasi static granular displacements in block caving: dilatancy effects on drawbody shape. Int J Rock Mech Min Sci 45(2):248–259. https://doi.org/10.1016/j.ijrmms.2007.07.005CrossRef

Melo F, Vivanco F, Fuentes C (2009) Calculated isolated extracted and movement zones compared to scaled models for block caving. Int J Rock Mech Min Sci 46(2):731–737

Song ZY, Konietzky H (2019) A particle-based numerical investigation on longwall top coal caving mining. Arab J Geosci 12(18):556. https://doi.org/10.1007/s12517-019-4743-zCrossRef

Song ZY, Konietzky H, Herbst M (2020) Drawing mechanism of fractured top coal in longwall top coal caving. Int J Rock Mech Min Sci 130:104329. https://doi.org/10.1016/j.ijrmms.2020. 104329

Unver B, Yasitli NE (2006) Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining. Int J Coal Geol 66(4):227–252. https://doi.org/10.1016/j.coal.2005.05.008CrossRef

Wang GF (1996) Development of fully mechanized top coal caving technology and new hydraulic support for top coal caving. J Min Strata Control Eng 4:18–20,23

Wang GF (2014) Theory system of working face support system and hydraulic roof support technology. J China Coal Soc 36(8):1593–1601

Wang GF, Pang YH, Li MZ et al (2017a) Hydraulic support and coal wall coupling relationship in ultra large height mining face. J China Coal Soc 42(2):518–526

Wang JC, Wei WJ, Zhang GY et al (2022) Top coal drawing mechanism and intelligent drawing. Science Press, Beijing

Wang JC, Wei WJ, Zhang JW et al (2017b) Stability analysis of support around the longwall top-coal caving mining in steeply thick coal seam. J China Coal Soc 42(11):2783–2791. https://doi.org/10.13225/j.cnki.jccs.2017.0914

Wang JC, Wei WJ, Zhang JW (2019) Effect of the size distribution of granular top coal on the drawing mechanism in LTCC. Granular Matter 21(3):70. https://doi.org/10.1007/s10035-019-0923-5CrossRef

Wang JC, Wei WJ, Zhang JW (2020a) Theoretical description of drawing body shape in an inclined seam with longwall top coal caving mining. Int J Coal Sci Technol 7(1):182–195. https://doi.org/10.1007/s40789-019-00286-z

Wang JC, Wei WJ, Zhang JW et al (2020b) Laboratory and field validation of a LTCC recovery prediction model using relative size of the top coal sizes. Bull Eng Geol Environ 80(2):1389–1401. https://doi.org/10.1007/s10064-020-01970-0CrossRef

Wang JC, Wei WJ, Zhang JW et al (2020c) Numerical investigation on the caving mechanism with different standard deviations of top coal block size in LTCC. Int J Min Sci Technol 30(5):583–591. https://doi.org/10.1016/j.ijmst.2020.06.001CrossRef

Wang JC, Yang SL, Wei WJ et al (2021) Drawing mechanisms for top coal in longwall top coal caving (LTCC): a review of two decades of literature. Int J of Coal Sci Technol 8(6):1171–1196. https://doi.org/10.1007/s40789-021-00453-1CrossRef

Wang JC, Zhang JW (2015) BBR study of top-coal drawing law in longwall top-coal caving mining. J China Coal Soc 40(3):487–493. https://doi.org/10.13225/j.cnki.jccs.2015.0278

Wang JC, Zhang JW, Li ZL (2016) A new research system for caving mechanism analysis and its application to sublevel top-coal caving mining. Int J Rock Mech Min Sci 88:273–285. https://doi.org/10.1016/j.ijrmms.2016.07.032

Wei WJ, Song ZY, Zhang JW (2018) Theoretical equation of initial top-coal boundary in longwall top-coal caving mining. Intern J Min Miner Eng 9(2):157–176. https://doi.org/10.1504/IJMME.2018.091972CrossRef

Wei WJ, Yang SL, Li M et al (2022) Motion mechanisms for top coal and gangue sizes in longwall top coal caving (LTCC) with an extra-thick seam. Rock Mech Rock Eng 55(8): 5107–5121. https://doi.org/10.1007/s00603-022-02928-2

Yang L, Li LH, Wei WJ (2021) Optimization of caving technology in an extrathick seam with longwall top coal caving mining. Adv Mater Sci Eng 2021:7725159. https://doi.org/10.1155/2021/7725159CrossRef

Yang SL, Wei WJ, Zhang JW (2020) Top coal movement law of dynamic group caving method in LTCC with an inclined seam. Mining, Metall Explor 37(5):1545–1555. https://doi.org/10.1007/s42461-020-00254-1

Yang SL, Zhang JW, Chen Y et al (2016) Effect of upward angle on the drawing mechanism in longwall top-coal caving mining. Int J Rock Mech Min Sci 85:92–101. https://doi.org/10.1016/j.ijrmms.2016.03.004CrossRef

Yasitli NE, Unver B (2005) 3D numerical modeling of longwall mining with top-coal caving. Int J Rock Mech Min Sci 42(2):219–235. https://doi.org/10.1016/j.ijrmms.2004.08.007

Zhang JW, Cheng DL, Yang YC et al (2022) Numerical and theoretical investigations of the effect of the gangue-coal density ratio on the drawing mechanism in longwall top-coal caving. Int J Coal Sci Technol 9:31. https://doi.org/10.1007/s40789-022-00501-4CrossRef

Zhang JW, Wang JC, Wei WJ (2018) Effect of face inclination angle on the drawing mechanism in longwall top-coal caving mining. J China Univ Mining Technol 47(4):805–814. https://doi.org/10.13247/j.cnki.jcumt.000889

Zhang JW, Wang JC, Wei WJ et al (2019a) Experimental investigation on the effect of size distribution on the flow characteristics of loose top coal. J China Coal Soc 44(4):985–994. https://doi.org/10.13225/j.cnki.jccs.2018.1231

Zhang NB, Liu CY (2016) Arch structure effect of the coal gangue flow of the fully mechanized caving in special thick coal seam and its impact on the loss of top coal. Int J Min Sci Technol 26(3):593–599. https://doi.org/10.1016/j.ijmst.2016.05.010CrossRef

Zhang QL, Yue JC, Liu C et al (2019b) Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method. Int J Rock Mech Min Sci 122:104033. https://doi.org/10.1016/j.ijrmms.2019.04.019

Zhang Y, Si YL, Shi L (2011) Numerical simulation of the effect of particle size on coal caving ratio. J Min Safety Eng 28(2):247–251

Titel: Drawing mechanisms of granular top coal considering the structure of hydraulic support in longwall top coal caving
verfasst von: Weijie Wei
Jiachen Wang
Jinwang Zhang
Shanxi Wu
Zheng Li
Xiangyang Zhang
Publikationsdatum: 01.04.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 4/2023
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-023-03173-9

Springer Professional

Abstract

Bitte loggen Sie sich ein, um Zugang zu Ihrer Lizenz zu erhalten.

Sie haben noch keine Lizenz? Dann Informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Technik"

Springer Professional "Wirtschaft+Technik"

Weitere Artikel der Ausgabe 4/2023

A novel unsaturated drainage layer in capillary barrier cover for slope protection

Effect of silica powder on microbial-induced carbonate precipitation improvement of medium-coarse sand

Hydrological model of landslide risk in Huai Nam Phung subbasin, Thailand

Determination of joint roughness coefficient using a cost-effective photogrammetry technique

Relationship between capillary water absorption mechanism and pore structure and microfracture of red-layer mudstone in central Sichuan

Predicting geomechanical, abrasivity, and drillability properties in some igneous rocks using fabric features and petrographic indexes