9DONG Fangting,SONG Hongwei.The broken rock zone around tunnels and its support theory[C].Proc of 7thintemational conference Morgantown WVU, 1988:336-343.
10JI Yaotao,FEl Qiang.Damage causes of U-shaped steel supported roadway and application of fully enclosed stent [J].Coal Science & Technology Magazine,2011 (3):56-57.