Abstract
Dynamic movement within strata overlying coal mines and the distribution of the movement boundary are keenly investigated topics but are hampered by the difficulties of obtaining reliable monitoring data of movement within rock masses. The work presented in this paper combines physical experiments with a digital photogrammetry method to investigate these two topics. Two similar material model experiments were conducted, and a high-precision, close-range digital photogrammetry method was employed to observe movement in the model. The results, including dynamic movement tracking of targeted points, indicate the presence of six different movement areas in the overlying strata in the model. Based on motion vector directions determined for the model, the overlying strata were divided into three zones: (1) a zone with the movement vector oriented vertically downward, (2) a zone with the movement vector oriented towards the goaf center, and (3) a zone with the movement vector oriented towards the coal pillar. Dynamic movement tracking shows that all zones experienced an initial, active, and decline stage, but the timing, duration, and movement tracks are different for each zone. The overall analysis reveals that the movement boundary in the strata overlying the rock mass is not a straight line, but an S-shaped curve, in contrast to the traditional findings with respect to the movement boundary. These findings may prove significance in guiding better prediction of movement and deformation inside a given rock mass and related improvements in protecting engineered infrastructure.
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Acknowledgments
The research has been financially supported by the National Engineering Laboratory of Mine Ecological Environmental Protection of Huainan Mining (Group) Co., Ltd.; the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); the National Technology Support Programs of China during the Twelfth Five-Year Plan Period under Grant No. 2012BAC04B03; and project supported by National Science and Technology Ministry under Grant No. 2012BAC10B02. All these financial supports are gratefully acknowledged, and the authors are especially grateful to reviewers for review and comments of this paper.
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Wu, K., Cheng, GL. & Zhou, DW. Experimental research on dynamic movement in strata overlying coal mines using similar material modeling. Arab J Geosci 8, 6521–6534 (2015). https://doi.org/10.1007/s12517-014-1685-3
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DOI: https://doi.org/10.1007/s12517-014-1685-3