Loose Circle Distribution Survey of Roadway Surrounding Rock of Isolation Pillar Zhang Hailei，Liu Tao，Guo Shengmao，Sun Jia，Wang Chengcai，Zhou Jianqiang

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ZHANG Hai-Lei, LIU Tao, GUO Sheng-Mao, SUN Jia, WANG Cheng-Cai, ZHOU Jian-Qiang

Metal Mine . 2014, (07): 151 -155 .