高承压水上采煤底板突水通道形成的监测与数值模拟

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Abstract Mining-induced floor failure and formation of water conducted pathway is the necessary conditions for water inrush in coal mine，which are the basis for monitoring and predicting water inrush. In order to study the formation and evolution of floor failure and water conducted pathway caused by coal mining above confined water with high pressure in Xinyi coalmine，two research means，i.e. field monitoring and numerical simulation，are introduced. Subsequently，the variations of electrical resistivity，stress and pore water pressure of floor during mining process are analyzed. The result shows that the floor failure caused by coal mining above confined water with high pressure is influenced significantly by advanced supporting stress of working face and the failure depth of floor of working face 11011 is about 25 m，which is greater than general empirical value. Based on fluid-solid coupling theory，the established numerical simulation model of mining-induced floor failure can reflect the influencing factors of floor failure more accurately and objectively；and the maximum failure depth is up to 23.75 m，which is very close to field monitoring result. The variations of electrical resistivity，stress and pore water pressure can better reflect the whole process of mining-induced floor failure formation，water inrush pathway evolution and water filling. The conclusion indicates that the above-mentioned parameters can be used as the precursor information for monitoring and short-term predicting the water inrush hazards in coalmines.

Key words： mining engineering coal mining above confined water with high pressure floor failure field monitoring numerical simulation precursor information short-term prediction

Received: 26 March 2012

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http://www.rockmech.org/EN/Y2012/V31/I8/1698

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