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Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep

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Abstract

Room-pillar technology is the main method used for underground gypsum resource mining. A large area of mined gob with a hanging roof is formed by continuous gypsum rock pillars, which continue to creep until failure occurs due to the long-term load of overlying strata. Once failure occurs, the gypsum-mined gob collapses suddenly and induces a serious dynamic mining disaster. In this study, using the creep experiment of gypsum rocks, a creep curve and the characteristics under the condition of a graded load were obtained. Furthermore, a creep model of the gypsum rock was established based on the creep experimental results. New FLAC numerical calculation models of gypsum-mined gob were established by inputting a creep model into the software for secondary development. Moreover, the stress distribution and plastic zone evolution of the gypsum rock pillars were analyzed. Finally, the mechanism of gypsum-mined gob collapse was revealed, and the lagging time was predicted. The results of this study are important for clarifying the lagging collapse mechanism of gypsum-mined gobs with rock creep.

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Acknowledgements

This research was supported by National Natural Science Foundation of China (51904177).

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Authors and Affiliations

  1. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China

    Shuli Wang, Zhihe Liu & Huaichang Zheng

  2. Shandong New Julong Energy Limited Liability Corporation, Heze, 274000, China

    Weikui Lv

Authors
  1. Shuli Wang
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  2. Weikui Lv
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  3. Zhihe Liu
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  4. Huaichang Zheng
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Contributions

SW carried out experiment and wrote the paper. WL carried out field work. ZL made numerical simulation. HZ analyzed experimental results.

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Correspondence to Shuli Wang.

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Wang, S., Lv, W., Liu, Z. et al. Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep. Geotech Geol Eng 40, 2489–2499 (2022). https://doi.org/10.1007/s10706-021-02040-2

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  • DOI: https://doi.org/10.1007/s10706-021-02040-2

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