| In order to eliminate the threat of Seam floor pressurized water, in combined withXinmi coalfield Zhaojiazhai Mine conditions in bottom layers of the aquifers andconfining, accounting of dynamic hydrological observation network and rules ofregional tectonic development,analyzes the changes of each aquifer water pressure andlevel in two1coal, found out the floor pressurized water supply source and the waterchannel guide, determined the law of the regional water supply, Eventually got the minefloor pressurized water Zhaojiazhai water supply rules presented by “Supply-basedstructure, supplemented buried limestone outcrop recharge, Coexistence of a variety ofsupply”. To determine the Mine Water Control should be used "sparse block incombination to block-based, comprehensive prevention and control of the overallstrategy.Through numerical simulation and related software RFPA2D-Flow, respectively, acomplete rock face excavation of floor damage, and the dip angle on the backplane faultwater inrush risk, draw three main conclusions: complete rock situations, differentlength of the stope, mining damage to bottom depth is different, the longer the workingface impelling mining damage to the deeper the floor; due to the existence of the faultzone, stope fault more nearly stope near the stress concentration zone overlay,mining-induced stress concentration is more obvious; changes in fault dip, faultactivation is different, the fault dip angle is lesser, shear stress on the fault is positiveand negative variations, and the peak value is bigger, makes the fault belt in thesurrounding rock fracture further development and new original crack initiationconstantly; Small tilt angle normal faults in the mining under the influence of the faultplane method to the stress changes greater stress peak is also larger, and prone tocompression and shear failure, easy to form the water flowing fractured zone.Finally, water risk zoning map are drawn of Zhaojiazai mining water-inrush fromtwo1coal. |
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