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Elliptical fracture network modeling with validation in Datong Mine, China

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Abstract

Roof-coal recovery rate and the performance of gas extraction are essentially controlled by the fractures within coal-rock mass. Thus, it is important to generate the accurate fracture network ahead of mining face. In this study, ten boreholes located differently from the 8212 working face of Tashan Mine in Datong coal mining group, China, were drilled. With the help of borehole video instruments, the location, orientation of each fracture and the fracture number of different intersection type on each borehole wall were mapped with the advancing of mining face. These data were analyzed using the Matlab Toolbox RJNS3D and Dips to determine structural homogeneity zone, to find the number of fracture sets that exist in the coal-rock mass, volume density frequency for each set and the probability distributions of orientation, fracture size in 3-D. Sampling biases associated with orientation, spacing were corrected during the process. The constructed fracture networks were validated by comparing the observed mean spacing along normal vector of mean orientation for each set and the predict value on similar scanlines.

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Acknowledgments

This research was funded by the State Key Basic Research Program of China (No. 2011CB201201), Sanjin Scholars Program of China (No. 2050205) and the National Natural Science Foundation of China (No. 51204112). The authors would like to thank three anonymous reviewers for their comments and suggestions which helped a lot in making this paper better.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China

    Wencheng Jin, Mingzhong Gao, Ru Zhang, Jing Xie & Zhiqiang Qiu

  2. Key Laboratory of Energy Engineering Safety and Mechanics on Disaster (Sichuan University), Ministry of Education, Chengdu, 610065, China

    Wencheng Jin, Mingzhong Gao, Ru Zhang, Jing Xie & Zhiqiang Qiu

  3. Datong Coal Mine Group, Datong, 037003, China

    Bin Yu

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  1. Wencheng Jin
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  2. Mingzhong Gao
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  3. Bin Yu
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  4. Ru Zhang
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  5. Jing Xie
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  6. Zhiqiang Qiu
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Correspondence to Mingzhong Gao.

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Jin, W., Gao, M., Yu, B. et al. Elliptical fracture network modeling with validation in Datong Mine, China. Environ Earth Sci 73, 7089–7101 (2015). https://doi.org/10.1007/s12665-015-4158-4

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