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复采矿井的重新开采对煤炭资源的可持续性发展有着极其深远的意义。由于残采矿井存在有较多的空巷以及旧采破碎区,无法进行常规的长臂开采,因此必须对残采破碎区进行适当的充填,而充填材料的选取是注浆成败的关键。实验材料为超高水材料,主要配料为半水石膏、复合速凝剂、消石灰以及复合缓凝分散剂。通过实验确定了超高水材料的最优配比为消石灰14.8%,半水石膏30.4%,复合速凝剂7.0%,复合缓凝分散剂剂47.8%,水灰比9∶1。
The recovery of the recovery mines has far-reaching significance for the sustainable development of coal resources. Due to the existence of more empty lanes in mining residual wells and the old mining area, the conventional long-arm mining can not be carried out. Therefore, it is necessary to fill the crushed area properly, and the choice of filling material is the key to the success or failure of grouting. Experimental materials for the ultra-high water materials, the main ingredients of hemihydrate gypsum, compound accelerator, slaked lime and compound retarding dispersant. The optimum proportion of ultrahigh water material was 14.8% of hydrated lime, 30.4% of hemihydrate gypsum, 7.0% of compound accelerator, 47.8% of compound retarding agent and 9:1 of water-cement ratio.