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Failure height and fracture evolution pattern of overburden rock in fully mechanized cave mining

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Abstract

With the application of a large-mining-height working face of a mine in Shanxi as the test surface, segmented water injection, borehole television and microseismic monitoring were employed to detect the damage height of overlying rock and digitally analyse the inclination of cracks before and after mining and the relationship between the number of cracks and depth, including the number of cracks and width. A similar simulation test was conducted of the fracture evolution process. The results of this study indicated that the height of the caving zone in fully mechanized cave mining reached 40.2 m, and the height of the water-conducting fracture zone reached 126.5 m. Premining fractures were dominated by high angles and small widths. Upon gradual advancement of the coal mining face, the number of cracks linearly increased, and newly formed cracks mainly exhibited low angles and moderate widths. At the early stage of mining, the number and width of cracks gradually increased with increasing advancement of the working face location. Due to the presence of overlying strata, the mined-out area could be compacted, and the number of cracks could be reduced, thus forming the characteristics of repeated cracks. During working face advancement, upon overburden collapse, cracks could appear, thereby gradually increasing the number and width of cracks. In the area near the coal wall ahead of the working face, the number of cracks remained large due to supporting pressure occurrence, and the crack density in the overburden was distributed in a snake-like pattern.

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  1. Department of Mining Engineering, Luliang University, Lvliang, 033000, China

    Xiaolei Wang

  2. Department of Railway Engineering, Sichuan College of Architectural Technology, Chengdu, 610399, China

    Hu Li

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Wang, X., Li, H. Failure height and fracture evolution pattern of overburden rock in fully mechanized cave mining. Arab J Geosci 15, 443 (2022). https://doi.org/10.1007/s12517-022-09705-z

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