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Damage Analysis of Soaking Gypsum and Safety Evaluation of Goaf: Based on Energy Dissipation Theory

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Abstract

Based on the theory of energy dissipation, the energy dissipation model of gypsum rock was established, and we analyzed the energy dissipation law of four stages (compaction stage, elastic stage, plastic stage, and failure stage) of gypsum rock failure process with different soaking time. The results show that: the energy of the system (total strain energy, releasable elastic strain energy and dissipative strain energy) changes dynamically. The total strain energy and releasable elastic strain energy decrease with the increase of soaking time. The growth rate is also negatively related to soaking time, while the dissipative strain energy is positively related to soaking time. Then, based on the geological characteristics and test data of gypsum mine in Northern Jiangsu Province, FLAC3D software was used to simulate the stability of goaf under natural and saturated conditions respectively. The simulation results show that the plastic area of goaf was not obvious and the stability was good under natural conditions. In the state of water saturation, most of the area was completely penetrated by the plastic area, the pillar was seriously unstable, which endangers the safety of the goaf.

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Acknowledgements

This work was supported by the Research and development project of Guizhou University of Engineering Science (Grant No: G2018016), Technology top talent support project of Guizhou Provincial Education Department ([2017]098), and Technology platform and talent team plan Project ([2018]5622).

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Authors and Affiliations

  1. College of Construction Engineering, Jilin University, Changchun, 130026, China

    Xiaoding Xu & Qiongqiong Tang

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Xiaoding Xu, Xuebin Cui & Xiaohu Zhang

  3. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou, 221008, Jiangsu, China

    Xiaoding Xu & Xue Liu

  4. School of Civil Engineering, Guizhou University of Engineering Science, Bijie, 551700, China

    Xiaohu Zhang & Yanhua Sun

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  1. Xiaoding Xu
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  2. Xuebin Cui
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  3. Xue Liu
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  4. Qiongqiong Tang
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Correspondence to Qiongqiong Tang.

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Xu, X., Cui, X., Liu, X. et al. Damage Analysis of Soaking Gypsum and Safety Evaluation of Goaf: Based on Energy Dissipation Theory. Geotech Geol Eng 38, 6177–6188 (2020). https://doi.org/10.1007/s10706-020-01426-y

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  • DOI: https://doi.org/10.1007/s10706-020-01426-y

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