瓦斯抽采钻孔注浆固结封孔过程中超高水膨胀浆液的可注性研究
Study on Groutability of Super High-aqueous Expansive Slurry During Hole Sealing Process of Gas Drainage Holes
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摘要: 我国煤层瓦斯抽采钻孔普遍存在封孔质量较差、漏气严重的问题，造成瓦斯抽采浓度偏低，限制了煤层瓦斯的开发与利用。为此，提出了一种利用新型超高水膨胀浆液注浆固结封堵钻孔的新方法，开展了超高水膨胀浆液的凝结实验和流动性测试研究，评价了超高水膨胀浆液的可注性。结果表明，超高水膨胀浆液的凝结时间受水灰比的影响显著，并且随水灰比的增大而呈非线性增大，能够满足注浆的时间要求；超高水膨胀浆液的漏斗黏度随着水灰比的减小而增大，水灰比6∶1以上的稳定浆液具有良好的可注性。Abstract: In China, the problems such as poor sealing quality and serious air leakage for gas drainage boreholes commonly exist in the coal seam and result in the low gas drainage concentration. This limits the development and utilization of coal seam gas. Thus, we propose a new method using a new type of ultra-high aqueous expansion slurry to grout and seal boreholes, and the experiment of condensation and fluidity test of ultra-high aqueous expansion slurry was carried out and the injection of ultra-high aqueous expansion slurry was evaluated. The results show that the setting time of ultra-high aqueous expansion slurry is significantly affected by the water cement ratio and it shows nonlinear growth with the increase of aqueous-cement ratio and can satisfy the time requirement of grouting. The funnel viscosity of ultra-high aqueous expansion slurry increases during the increase of aqueous-cement ratio and the stable slurry which has an aqueous-cement ratio more than 6:1 gets a good injection.
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