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Abstract In order to accurately detect the height of water flowing fractured zone in overlying roof strata after the mining face has been mined and ensure that mining underwater is safe and reliable，empirical formula calculation，downhole plugging drilling section water injection(put) crack measurement system and drilling television detecting system are used to detect the development of water flowing fractured zone. Results show that，using the above three methods respectively，the heights of water flowing fractured zone，which are 25.24–36.50，26.83–28.33 and 25.50–29.20 m，are obtained. The results verify that using downhole plugging drilling section water injection(put) crack measurement system to detect the height of water flowing fractured zone is reasonable and reliable，and it not only provides a theoretical support for Sitai coal mining underwater，but also provides reference for other coals to detect water flowing fractured zone.
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Received: 30 April 2013
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2014, Vol. 33 
