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Simulated Test on Compression Deformation Characteristics and Mechanism of Fractured Rock in Mined Out Area

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Abstract

In order to study the whole compression process deformation characteristics, the compression test of fractured rock in goaf was carried out by using the large-scale compression deformation seepage experiment system of fractured rock. Through the Taibo theory, the particle size gradation of the fractured rock mass was determined as n is 0.5. Loaded prepared dry fractured rock into the experimental cabin, and carried out the short-time creep test for 2.5 h at different gradients in a graded loading manner. After level 5 gradient loading for 1.25 h, carried out the long-term creep test under immersion condition. After the creep test, additional stress was added and the additional deformation was observed. The results show that the fractured rock compaction process includes initial compaction, crushing compaction; under the influence of load gradient and water, the fractured rock compaction process has accelerated deformation, which threatens the goaf stability; under creep condition, compaction deformation shows logarithmic growth, slows down gradually and tends to be stable; After fractured rock in the mined out area is stabilized by compaction, it is still possible to be activated under the influence of building load.

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Acknowledgements

This research was supported by grants from the Key Research and Development Program (research) Project in the Shandong Province, China (Grant No. 2016GSF117036) and the Foundation from the the Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources (Henan Polytechnic University) (Grant No. S201606) and Shandong Province Natural Science Foundation Project (ZR2017MEE055) and China Coal Industry Association scientific and technological research guidance project (MTKJ2016-277).

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Authors and Affiliations

  1. College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, China

    Changxiang Wang, Yao Lu, Guo Hao, Boqiang Cui & Zihao Zhao

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  1. Changxiang Wang
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  2. Yao Lu
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  3. Guo Hao
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  4. Boqiang Cui
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  5. Zihao Zhao
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Correspondence to Yao Lu.

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Wang, C., Lu, Y., Hao, G. et al. Simulated Test on Compression Deformation Characteristics and Mechanism of Fractured Rock in Mined Out Area. Geotech Geol Eng 36, 2809–2821 (2018). https://doi.org/10.1007/s10706-018-0503-1

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  • DOI: https://doi.org/10.1007/s10706-018-0503-1

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