Metal Mine ›› 2015, Vol. 44 ›› Issue (04): 74-78.
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Zhang Yujun
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Published:
Abstract: Aiming at characteristics of large mining depth,multilayer aquifer threatening the main coal seam,and high intensity of mining In Nalinhe No.2 mine of Mengxi mining area,based on determination of the type of water disaster,the numerical simulation,physical simulation and experience similarity method were adopted to study the overburden failure height of main coal layer.The law of water aquifers was analyzed,and the “dewatering and control” technology under composite water was proposed.The research results showed that:the water prevention in Mengxi mining mainly exists in coal mining under composite water.It is predicted that the height of failure zone during mining of 3-1 coal in Nalinhe No.2 coal mine was selected as 4.5 times of the caving-height ratio and 15 times of the facture-height ratio.Based on The proposed “dewatering and control” technology,the Cretaceous Zhidan group aquifer chose the “mining under water” scheme,Zhiluo bottom sandstone aquifer took “mining with dewatering”,and Yanan group aquifer adopted the combined scheme of “borehole dewatering or drainage,mining dewatering or drainage,mining after drainage and mining with drainage”.
Key words: Depth, Under composite water, High intensity mining, Dewatering and controlling
ZHANG Yu-Jun. Technology of Dewatering and Controlling for High Strength of Mining under Deep Composite Water in Mengxi[J]. Metal Mine, 2015, 44(04): 74-78.
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