Abstract
The mismatch of speed of mining and excavating is the main contradiction of high efficiency production in China, improving the excavating speed of coal roadway is an effective way to solve the problem. According to the engineering geological conditions of the main haulage roadway 21205 in Hulusu Coal Mine, the technical problems existing in the original support scheme were analyzed, increased the excavating speed of roadway through improve support efficiency of single bolt and reducing density of bolt, a rapid excavation technology based on anchoring method of critical high efficiency and low density on roof of coal roadway was proposed. The influence of different bolt length and different pre-tightening force on the stability of roadway roof was studied by FLAC3D simulation, the results showed: (1) increasing the length and pre-tightening force can control the development of the roof vertical strain with a certain range; (2) as the length of bolt increases, the compressive stress zone of the rock layer between the two bolts increases and the compressive stress in the rock layer area of the anchorage section tends to increase; (3) with the increase of pre-tightening force, the effective, compressive stress zones between the two bolts overlap with each other, forming a whole, and the compressive stress values in the near zero stress zone increase. Decided the scheme that, bolt length is 4 m, pre-tightening force is 200 kN, and the support density is 0.5 root/m2, industrial experiments were carried out. The mine pressure monitoring showed that the roof of the roadway has almost no ionosphere, and the deep ionosphere was well controlled. The monthly excavating progress of the roadway was increased from 520 to 825 m, with a rise of 58.7%, the technical and economical effects were significant. It was proved that the scheme is in line with the actual. It can provide reference for roadway rapid excavating support technology for similar conditions.
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References
Gao JG (2011) Analysis of application effect about rapid excavation technology in coal roadway. Coal Sci Technol 39(S1):16–18
Guo WB, Deng KZ, Zou YF (2005) Research on surface movement parameters of strip-partial mining. J China Coal Soc 30(2):182–186
Han CL, Zhang N, Kan JG et al (2017) Mechanism and application of double active control with pressure-relieving anchoring for gob-side entry retaining. J China Coal Soc 42(s2):323–330
Kang HP, Jiang TM, Gao FQ (2008) Design for pretensioned rock bolting parameters. J China Coal Soc 30(2):182–186
Kang HP, Wang JH, Lin J (2010) Study and applications of roadway support techniques for coal mines. J China Coal Soc 11:1809–1814
Kushwaha A, Singh SK, Tewari S et al (2010) Empirical approach for designing of support system in mechanized coal pillar mining. Int J Rock Mech Min Sci 47(7):1063–1078
Liu QS, Zhao YF, Zhang XP (2019) Case study: using the point load test to estimate rock strength of tunnels constructed by a tunnel boring machine. Bull Eng Geol Environ 78(3):1727–1734
Ma CL, Zhang Y, Hu WS (2013) Rapid excavation construction technology for large section roadway. Saf Coal Mines 44(5):98–100
Miu XX, Qian MG (2009) Research on green mining of coal resources in China: current status and future prospects. J Min Saf Eng 26:1–14
Peng SP, Zhang B, Wang T (2015) China’s coal resources: octothorpe shaped distribution characteristics and sustainable development strategies. Eng Sci 17(9):29–35
Qian MG, Miu XX, Xu JL (2007) Green mining of coal resources harmonizing with enviroment. J China Coal Soc 1:1–7
Qian DY, Zhang N, Pan DJ et al (2017) Stability of deep underground openings through large fault zones in argillaceous rock. Sustainability 9(12):2153
Wang JL (2002) Research and discovery on rapid excavation technology for large cross section seam roadway. Coal Sci Technol (S1):55–57 + 54
Xie ZZ, Zhang N, Qian DY et al (2018) Rapid excavation and stability control of deep roadways for an underground coal mine with high production in Inner Mongolia. Sustainability 10(4):1160
Xu ZM, Gao S, Cui SY et al (2017) Hydro-geological basic and practice for water-preserved mining in ecologically vulnerable area: a case study in Hami coalfield. J China Coal Soc 42(1):80–87
Zhang ZG (2016) Development tendency and key technology of mine seam gateway rapid driving system. Coal Sci Technol 44(1):55–60
Zhang N, Yuan L (2006) Control principle of separating and broken roof rock strata in roadway. J Min Saf Eng 23(1):34–38
Zhang C, Yang JS, Fu JY et al (2019) Performance evaluation of modified cement-sodium silicate grouting material for prereinforcing loose deposit tunnels. J Mater Civ Eng 31:060190037
Zhao XS (2007) Present status and development tendency of high efficiency roadway driving technology in coal mine. Coal Sci Technol 35(4):5–14
Acknowledgements
Funding was provided by National Natural Science Foundation of China Youth Science Foundation (51404251), Project supported by Youth Fund of Jiangsu Natural Science Foundation (BK20140198) and Ministry of Education Science and Technology Project Innovation Team Funding (IRT_14R55).
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Yang, H., Han, C., Zhang, N. et al. Research and Application of Low Density Roof Support Technology of Rapid Excavation for Coal Roadway. Geotech Geol Eng 38, 389–401 (2020). https://doi.org/10.1007/s10706-019-01029-2
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DOI: https://doi.org/10.1007/s10706-019-01029-2