高承压水上采煤底板突水通道形成的监测与数值模拟

 底板采动破坏及导水通道的形成是底板突水发生的必要条件，也是进行矿井突水的监测预报基础。以新义矿为例，采用现场监测及数值模拟等手段，研究高承压水上采煤底板采动破坏及突水通道的形成及演化过程，分析该过程中的底板电阻率、应力及孔隙水压力的变化规律。结果表明：高承压水上采煤底板受工作面超前支撑压力破坏严重，11011工作面底板破坏深度达到25 m，大于一般经验计算值；建立的基于流–固耦合底板采动破坏数值模拟模型更能准确、客观地反映底板破坏的影响因素，模拟的最大破坏深度为23.75 m，与现场监测结果接近；采动过程中的底板电阻率、应力以及孔隙水压力变化较好地反映底板破坏及突水通道形成、演化以及充水的整个过程，可作为矿井突水临突监测预报的重要信息源。

MONITORING AND NUMERICAL SIMULATION OF FORMATION OF WATER INRUSH PATHWAY CAUSED BY COAL MINING ABOVE CONFINED WATER WITH HIGH PRESSURE

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.