为确保注采比和保障地表减沉效果,霍尔辛赫煤业拟采用煤矸石粉-煤泥混合浆液进行覆岩离层注浆充填开采,通过正交实验获得了煤矸石粉-煤泥覆岩离层注浆充填材料的浆液密度、流动度、黏度、自由析水率和压实析水率等工作性能,研究煤矸石粉-煤泥质量比、水灰比对其浆液工作性能的影响,确定了其浆液最优配比。结果表明:水灰比一定时,随着煤矸石粉-煤泥质量比增大,浆液密度、黏度增大,流动度收缩,自由析水率和压实析水率降低;煤矸石粉-煤泥质量比一定时,随着水灰比增大,浆液密度、黏度减小,流动度延展,自由析水率和压实析水率提高;质量比70:12、水灰比0.8以及质量比65:12、水灰比0.7的煤矸石粉-煤泥浆液适用于覆岩离层注浆充填。

In order to ensure the injection production ratio and guarantee the surface subsidence re-duction effect, Huoerxinhe Coal Industry plans to use a mixed slurry liquid of coal gangue pow-der-coal slime for oveburden rock layer separation grouting and filling mining. Through orthogonal experiments, the working performance such as the slurry liquid density, fluidity, viscosity, free water separation rate, compacted water separation rate and others of the coal gangue powder-coal slime overburden rock layer separation grouting and filling material are obtained. The influence of the coal gangue powder-coal slime mass ratio and water cement ratio on the working performance of its slurry liquid is studied, and its slurry liquid optimal ratio is determined. The results show that when the water cement ratio is constant, as the coal gangue powder-coal slime mass ratio increases, the density and viscosity of the slurry liquid increase, the fluidity shrinks, and the free water separation rate and compacted water separation rate decrease; When the coal gangue powder-coal slime mass ratio is constant, as the water cement ratio increases, the density and viscosity of the slurry liquid decrease, the fluidity extends, and the free water separation rate and compacted water separation rate increase; Coal gangue powder-coal slime slurry liquid with a mass ratio of 70:12, a water cement ratio of 0.8, and a mass ratio of 65:12, a water cement ratio of 0.7 are suitable for overbur-den rock layer separation grouting and filling.