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Safe roof thickness and span of stope under complex filling body

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Abstract

Longhole caving method was used to mine gently inclined thick orebody step by step in a test stope of tin mine under complex filling body. The problem that the complex filling body around the stope affects the stability of roof thickness, chamber and spacer pillar in actual mining was investigated; meanwhile, the formed goaf during mining is so vulnerable that surrounding rock collapses early. Based on this point, elasticity mechanics and limit span theory were used to study separately the roof thickness and the span limit of goaf formed in mining, and then a reasonable roof thickness of 8 m and goaf span of 14 m are proposed. In addition, the stability of roof thickness, chamber and spacer pillar were investigated and analyzed by using numerical analysis method; meanwhile, the field monitoring on the displacement of caving chamber was conducted. The results show that the maximum compressive stress of surrounding rock is 20 MPa, and the maximum tensile stress is 1.2 MPa, which is less than the ultimate tensile strength of 2.4 MPa. Moreover, plastic zone has little influence on stope stability. In addition, the displacement of 11 mm is also smaller. The displacement monitoring results are consistent with the numerical results. Thus, the roof thickness and span of goaf proposed are safe.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Zhou-quan Luo  (罗周全), Cheng-yu Xie  (谢承煜), Nan Jia  (贾楠) & Biao Yang  (杨彪)

  2. College of Resources and Metallurgy Engineering, Guangxi University, Nanning, 530004, China

    Gui-hai Cheng  (程贵海)

Authors
  1. Zhou-quan Luo  (罗周全)
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  2. Cheng-yu Xie  (谢承煜)
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  3. Nan Jia  (贾楠)
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  4. Biao Yang  (杨彪)
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  5. Gui-hai Cheng  (程贵海)
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Corresponding author

Correspondence to Zhou-quan Luo  (罗周全).

Additional information

Foundation item: Project(2012BAK09B02-05) supported by the National Science and Technology Pillar Program during the 12th Five-Year Plan Period; Project(11KF02) supported by the Research Fund of the State Key Laboratory of Coal Resources and Mine Safety

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Luo, Zq., Xie, Cy., Jia, N. et al. Safe roof thickness and span of stope under complex filling body. J. Cent. South Univ. 20, 3641–3647 (2013). https://doi.org/10.1007/s11771-013-1891-2

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  • DOI: https://doi.org/10.1007/s11771-013-1891-2

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