松散承压含水层水位变化与顶板来压的联动效应及其应用研究

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Abstract According to the disaster prevention problem of support crushing and water inrush when mining underlying unconsolidated confined aquifer in Qidong coal mine，the actual measurement and experimental study of connected effect between water level variation and roof weighting of working face are conducted. The study results show as follows：water level drawdown appears before support crushing and water inrush；and the velocity of water level drawdown basically keeps constant. The scope and speed of water level drawdown are closely related to the intensity of the roof weighting of working face. The greater the scope and speed of water level drawdown are，more intense the weighting pressure is；thus the danger of support crushing and water inrush increases. Different modalities of overburden stratum breaking movements are the main reason for the above connected effect. When the key stratum breaks one by one，the overburden strata rotates and descends slowly；and the scope and speed of water level drawdown are smaller. There is no danger of support crushing and water inrush accident. When compound breakage of key stratum happens，the overburden strata slide unstably and collapse holistically；and large numbers of volumes of caving spaces transfer to the top surface of bedrock in a short time. Meanwhile，the water level descends greatly and quickly，in which case the danger of support crushing and water inrush accident exists. Using the connected effect between water level variation of unconsolidated confined aquifer and roof weighting of working face，the warning method using drawdown speed of groundwater level for support crashing and water inrush accidents when mining underlying unconsolidated confined aquifer is put forward. Based on the theory of groundwater dynamics，the calculation formula for critical warming values of drawdown speed of water level are given when support crushing and water inrush accident happen at the working face. The calculation formula are served as guidance for the support crushing and water inrush prevention practice at working face 6130.

Key words： mining engineering unconsolidated confined aquifer key stratum water level variation support crushing and water inrush accident warning method

Received: 26 January 2011

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http://www.rockmech.org/EN/Y2011/V30/I9/1872

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