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Design of multi-layer coupling support and span of setup entry roof at depth

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Abstract

The setup entry is driven at the starting line of a longwall panel and used to set up equipment, from which mining activities begin. The roof stability of setup entry roof with large span is a major concern in deep underground coal mines, especially when the surrounding strata are weak and fractured. Large-span setup entry roofs at depth induce a serious danger of roof fall and difficulty in the determination of the rational span. We determined a reasonable span for such a situation by studying the 1105 large mining-height coal face setup entry of Zhaogu No. 2 coal mine. A multi-layer coupling support method, led by long-extension bolt and medium length cable, was proposed. The setup entry was designed for four layers of coupling support. The setup entry’s reasonable span was determined and the reliability of the coupling support system was analyzed. These measurements allowed us to set up separate roof depth-displacement monitors and bolt (cable)-condition sensors in the mined area and enabled us to remove secondary instrumentation. The monitoring results show that unstable setup entry roof collapse occurs as roof-fractionated instantaneous fracture within 0 to 6–10 m. The size of the hanging roof varies between 11.7 and 13.6 m at the first fracture, and the hanging roof varies between 13.0 and 14.0 m at the time of the second fracture. For complete roof instability, the reasonable span should be ~ 12.4 m. The deformation of each horizon’s roof and the roof fall achieve effective control in the anchorage range before roof fracture, and the support effect of the core level is significant with a long-extension bolt (20-mm diameter × 5000 mm) and cable (21.6-mm diameter × 12,000 mm). The roof’s rupture depth did not develop further, which indicates that the multi-layer coupling support can adapt to control the large-span roof of setup entry at depth.

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References

  • Boreek M, Chudek M (1985) Rock mass mechanics [M]. Translated by Yu Zhenhai, Liu Tianquan. Beijing, China Coal Industry Publishing House, pp 29–36 (in Chinese)

  • Chang Q, Zhou H, Xie Z, Shen S (2013) Anchoring mechanism and application of hydraulic expansion bolts used in soft rock roadway floor heave control. Int J Min Sci Technol 23(3):323–328

    Article  Google Scholar 

  • Guo X, Ma N, Zhao X et al (2016) General shapes and criterion for surrounding rock mass plastic zone of round roadway. J China Coal Soc 41(8):1871–1877 (in Chinese)

    Google Scholar 

  • Jia H, Guo S, Wang X et al (2012) Design and application of multi point roof separation monitor to mine gateway. Coal Mine Engineering 09:110–113 (in Chinese)

    Google Scholar 

  • Jiang L, Sainoki A, Mitri HS, Ma N, Liu H, Hao Z (2016a) Influence of fracture-induced weakening on coal mine gateroad stability. Int J Rock Mech Min Sci 88:307–317

    Article  Google Scholar 

  • Jiang L, Mitri HS, Ma N, Zhao X (2016b) Effect of foundation rigidity on stratified roadway roof stability in underground coal mines. Arab J Geosci 9(1):32

    Article  Google Scholar 

  • Jiang L, Zhang P, Chen L, Hao Z, Sainoki A, Mitri HS et al (2017) Numerical approach for goaf-side entry layout and yield pillar design in fractured ground conditions. Rock Mech Rock Eng 50(4):1–23

    Google Scholar 

  • Li JP, He FL, Yan H et al (2012) The caving and sliding control of surrounding rocks on large coal roadways affected by abutment press. Saf Sci 50(4):773–777

    Article  Google Scholar 

  • Li J, Fan L, Zhao X et al (2014a) On danger-area forecast system of working face opening roof caving. J Min Saf Eng 03:390–398 (in Chinese)

    Google Scholar 

  • Li WF, Bai JB, Syd P, Wang XY, Xu Y (2014b) Numerical modeling for yield pillar design: a case study. Rock Mech Rock Eng 48:305–318. https://doi.org/10.1007/s00603-013-0539-8

    Article  Google Scholar 

  • Liu H, Ma N (2011) Coal mine roadway roof caving high risk areas recognition technology. J China Coal Soc 12:2043–2047 (in Chinese)

    Google Scholar 

  • Liu H, Ma N, Li J (2012) Evolution and distribution characteristics of roof shallow fissure channel. J China Coal Soc 09:1 451–1 455 (in Chinese)

    Google Scholar 

  • Lu J, Anil R, Khaled M, Syd P (2008) Effects of rock/coal interface property on coal pillar strength. In: Proceeding of 27th international conference on ground control in mining. West Virginia University, Morgantown, pp 262–267

    Google Scholar 

  • Ma ZT, Gao DC, Li RR (2013) Determination and failure mechanism of coal pillar of driving roadway along goaf in deep mining. In: Proceedings of the 3rd international workshop on mine hazards prevention and control. CSIRO Earth Sci & Resource Engn, Brisbane, pp 19–21

    Google Scholar 

  • Ma N, Zhao X, Zhao Z et al (2015) Stability analysis and control technology of mine roadway roof in deep mining. J China Coal Soc 40(10):2287–2295 (in Chinese)

    Google Scholar 

  • Ma N, Guo X, Zhao Z et al (2016) Occurrence mechanisms and judging criterion on circular tunnel butterfly rock burst in homogeneous medium. J China Coal Soc 41(11):2679–2688 (in Chinese)

    Google Scholar 

  • Shen B (2014) Coal mine roadway stability in soft rock: a case study. Rock Mech Rock Eng 47:2225–2238

    Article  Google Scholar 

  • Wang G, Pang Y, Liu J (2012) Determination and influence of cutting height of coal by top coal caving method with great mining height in extra thick coal seam. J China Coal Soc 11(1):777–1 782 (in Chinese)

    Google Scholar 

  • Wang P, Jiang L, Jiang J, Zheng P, Li W (2018) Strata behaviors and rock burst–inducing mechanism under the coupling effect of a hard, thick stratum and a normal fault. International Journal of Geomechanics 18(2):04017135

    Article  Google Scholar 

  • Yan S, Yin X (2008) Discussing about the main theoretical problems of long wall with top coal caving. J China Coal Soc 05:481–484 (in Chinese)

    Google Scholar 

  • Yan S, Bai J, Wang X, Huo L (2013) An innovative approach for gateroad layout in highly gassy longwall top coal caving. Int J Rock Mech Min Sci 59:33–41

    Article  Google Scholar 

  • Zhang H, Cao J, Tu M (2013) Floor stress evolution laws and its effect on stability of floor roadway. Int J Min Sci Technol 23(5):631–636

    Article  Google Scholar 

  • Zhang K, Zhang G, Hou R, Wu Y, Zhou H (2015) Stress evolution in roadway rock bolts during mining in a fully mechanized longwall face, and an evaluation of rock bolt support design. Rock Mech Rock Eng 48:333–344

    Article  Google Scholar 

  • Zhao H, Yao J, He F et al (2007) Application of prestress truss cable in large cross section coal roadway. J China Coal Soc 32(10):1 061–1 065 (in Chinese)

    Google Scholar 

  • Zhao Z, Ma N, Guo X et al (2016) Mechanism conjecture of butterfly rock burst in coal seam roadway. J China Coal Soc 33(12):2689–2697 (in Chinese)

    Google Scholar 

  • Zhu Y, Feng T (2012) Research on dynamic stability classification of bolt support for super-long coal roadway roof. J China Coal Soc 04:565–570 (in Chinese)

    Google Scholar 

Download references

Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51604094, 51674098) and the Research Fund of State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines (Henan Polytechnic University G201612).

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, China

    Hou-sheng Jia, Lu-yao Wang, Shao-wei Liu & Meng-xiong Fu

  2. State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo, Henan Sheng, China

    Hou-sheng Jia & Shao-wei Liu

  3. Collaborative Innovation Center of Coal Work Safety, Jiaozuo, 454003, Henan, China

    Hou-sheng Jia

  4. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Zhi-yao Feng

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  1. Hou-sheng Jia
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  2. Lu-yao Wang
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  3. Shao-wei Liu
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  4. Zhi-yao Feng
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  5. Meng-xiong Fu
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Correspondence to Hou-sheng Jia.

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Jia, Hs., Wang, Ly., Liu, Sw. et al. Design of multi-layer coupling support and span of setup entry roof at depth. Arab J Geosci 11, 488 (2018). https://doi.org/10.1007/s12517-018-3779-9

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  • DOI: https://doi.org/10.1007/s12517-018-3779-9

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