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董家河煤矿是陕西省水文地质条件极复杂型矿井,在30多年的煤矿开采中,逐步形成了一套以“底板静压注浆
Dongjiahe Mine is a very complicated hydro-geological mine in Shaanxi Province. In the more than 30 years of coal mining, a set of ”static pressure grouting