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    • Diffraction Characteristics of Small Fault ahead of tunnel face in coal roadway 

      Wang, Bo; Liu, Shengdong; Zhou, Fubao; Zhang, Jun; Zheng, Fangkun
      Small fault ahead of the tunnel face in coal roadway is the important hidden hazard factor of coal and gas outburst accidents. The study of small fault prediction has important practical significance, which is the urgent ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.