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《The Chinese Journal of Geological Hazard and Control》 2014-01
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Design on the size of waterproof pillar(rock) in subsea bedrock mining

WU Hao;ZHAO Guo-yan;MA Shao-wei;CAO Wen-zhuo;JIANG Hai-tao;School of Resources and Safety Engineering,Central South University;  
Xinli district of Sanshandao Gold Mine is the first metal mine undersea in China. To ensure safety of mining undersea and reduce the loss of mineral resources,it's crucial to design the size of waterproof pillar( rock) scientifically and reasonably in engineering practice. According to the mining conditions,firstly,the paper introduces the equivalent thickness coefficient n to amend the empirical formula of stope's water flowing fractured zone,by which,the minimum height of the waterproof pillar calculated is( 48. 1 ± 5. 6) m. Secondly,the paper analyzes and calculates the size of waterproof pillar in two mechanical models of waterproof pillar from the aspects of both strength and stiffness. The regression curve that between the height of waterproof pillar and safety factor is fitted in condition of strength. Then,the critical height of waterproof pillar is 37. 24m and 40. 40m respectively,calculated by integral degeneration in condition of strength. Finally,the water flowing fractured zone of-200m stope measured by Flac3Dnumerical simulation is 34. 75m. Based on the above findings,the height of waterproof pillar( rock) of Xinli district is 54m.
【Fund】: 中南大学中央高校基本科研业务费专项资金资助(2013zzts260);; 国家重点基础研究发展规划(“973”计划)项目(2010CB732004)
【CateGory Index】: TD857
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