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Pre-reinforcement grout in fractured rock masses and numerical simulation for optimizing shrinkage stoping configuration

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Abstract

Proper room and pillar sizes are both critical factors for safe mining and high ore recovery rate in shrinkage stoping mining of underground metal mines. The rock masses of Tangdan copper mine of China are fractured, which needs much reinforcement and support prior to mining. Cement-sodium silicate grout technology was selected, then its related parameters such as grout pressure, diffusion radius and time were calculated and proposed. In order to test the effect of the pressured grout in the fractured No.4 ore block, field experiments were conducted. To optimize stoping configuration, three-dimensional numerical simulation with ANSYS and FLAC 3D softwares was proposed. The results show that the drilling porosity and mechanical properties of the rock masses are increased obviously. After grout, ore recovery rate is increased by 10.2 % employing the newly designed stoping configuration compared with the previous. Last, analyzed from the surface movements, roof subsidence and the maximum principal stress of the pillars, the mining safety is probable of being ensured.

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Shao-feng Yu  (于少峰), Ai-xiang Wu  (吴爱祥), Yi-ming Wang  (王贻明) & Tao Li  (李涛)

  2. Key Laboratory of High-Efficient Mining and Safety of Metal of Ministry of Education, University of Science and Technology Beijing, Beijing, 100083, China

    Shao-feng Yu  (于少峰), Ai-xiang Wu  (吴爱祥), Yi-ming Wang  (王贻明) & Tao Li  (李涛)

Authors
  1. Shao-feng Yu  (于少峰)
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  2. Ai-xiang Wu  (吴爱祥)
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  3. Yi-ming Wang  (王贻明)
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  4. Tao Li  (李涛)
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Corresponding author

Correspondence to Yi-ming Wang  (王贻明).

Additional information

Foundation item: Projects(51374034, 51674012) supported by the National Natural Science Foundation of China; Project(2013BAB02B05) supported by the China National Science and Technology Support Program during the 12th Five-Year Plan Period

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Yu, Sf., Wu, Ax., Wang, Ym. et al. Pre-reinforcement grout in fractured rock masses and numerical simulation for optimizing shrinkage stoping configuration. J. Cent. South Univ. 24, 2924–2931 (2017). https://doi.org/10.1007/s11771-017-3706-3

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  • DOI: https://doi.org/10.1007/s11771-017-3706-3

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