Geomechanics and Engineering

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Research on theory, simulation and measurement of stress behavior under regenerated roof condition

  • Li, Xuelong (State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Chen, Shaojie (State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Zhang, Qiming (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology) ;
  • Gao, Xin (State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Feng, Fan (State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology)
  • Received : 2021.03.20
  • Accepted : 2021.06.21
  • Published : 2021.07.10
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Abstract

To determine ground stress behavior under the special condition of a regenerated roof, we established a model of elastic rectangular cantilever thin plates. Moreover, the critical conditions for bending and fracturing the regenerated roof during mining were analysed. Meanwhile, by applying continua FLAC-3D numerical simulation, this research simulated changes in the stress and strain on a regenerated roof during mining and proposed prevention and control methods for dynamic disasters. The results show that: (1) the thinner the regenerated roof, the larger the tensile stress on the roof based on analysis using the theoretical model. Furthermore, the longer the advance distance during mining, the greater the tensile stress on the regenerated roof. (2) By analysing simulation results, during the fracturing of the regenerated roof, roof displacement firstly suddenly increases and then gradually decreases to be stable. Floor-heave-induced displacement presents a divergent state, that is, increases outwards in an elliptical manner. (3) For control of the regenerated roof, monitoring on activities of the roof should be strengthened and stress should be relieved timeously. Moreover, effective support methods should be taken to prevent development of hazards on working faces and roadways caused by the widespread behavior of the roof.

Keywords

Acknowledgement

This work is supported by the National Natural Science Foundation of China (51904167, 51474134 & 51774194 & 52004143), Research Fund of the State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM19KF008), Taishan Scholars Project, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, Natural Science Foundation of Chongqing, China (cstc2019jcyj-bsh0041), Postdoctoral Science Foundation Project Funded by State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-BH201903), Key R&D plan of Shandong Province (2019SDZY034-2) and China Postdoctoral Science Foundation (2020M670781). We thank anonymous reviewers for their comments and suggestions to improve the manuscripts.

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