防治俯采工作面煤自燃稠化浆体的流变特性研究OACSTPCD

In response to the problems of difficulty in grouting,high air leakage intensity,and inability to pile up slurry at high altitudes during the prevention and control process of coal spontaneous combustion in steep dip underhand working face,a slurry with different water to soil ratios and thickening agent concentrations was prepared using polymer material,surfactant,and solid phase materials as raw materials,and suspension stability experiments were conducted to study the suspension characteristics of thickened slurry.By conducting rheological characteristic tests on thickened slurry of different concentrations and fitting the theological constitutive equation,a thickened slurry material with excellent performance and suitable for steep dip underhand working face was developed.Finally,Fluent software was used to simulate the diffusion characteristics of thickened slurry in the goaf.The research results indicate that loess is the most suitable solid phase material for thickened slurry.When the water to soil mass ratio is 8∶1 and the mass fraction of thickening agent is 0.3％,the suspension performance of thickened slurry is good,and its yield stress is the smallest,indicating better flowability.The flow velocity of thickened slurry in the goaf is inversely proportional to the diffusion radius,and the diffusion radius reaches its maximum value after 6 h of slurry injection.