新型瓦斯抽采封孔材料的试验与应用

Experiment and application of new gas extraction hole sealing material

针对煤矿井下瓦斯抽采封孔水泥基材料早期强度低的问题,将普通水泥基材料与外加剂等进行复配,利用正交试验来筛选和分析最佳组合,并进行力学性能测试和现场试验。结果表明,当NaAlO_(2)为0.8%、Na_(2)SO_(4)为0.4%、NaCl为0.4%、TEOA为0.05%、AMPS为0.8%、铝粉0.1%时,水泥基材料1d早强组的强度是基准组抗压强度的400%,3 d的强度可以提高到200%;复合水泥基材料抗压强度达到6.73 MPa;而同样条件下的基准组是4.89 MPa。同时,复合水泥基材料较之前有更好的封孔质量和瓦斯抽采封孔适应性,封孔材料膨胀率由普通水泥基封孔材料的0.1%提高到10%,很大程度上提高了封孔效率和瓦斯抽采率。

In view of the low early strength of cement-based materials for gas extraction and sealing hole in coal mine,the common cement-based materials and additives are compounded,and the optimal components are selected and analyzed by orthogonal test,and the mechanical property test and field test are carried out.The results show that when NaAlO_(2)is 0.8%,Na_(2)SO_(4)is 0.4%,NaCl is 0.4%,TEOA is 0.05%,AMPS is 0.8%,and aluminum powder is 0.1%,the compressive strength of cement-based materials in the early strength group is 400%of that in the base group,and it can be increased to 200%in the three days;the compressive strength of composite cement-based materials is 6.73 MPa.Under the same conditions,the reference group is 4.89 MPa.At the same time,the composite cement-based material has better sealing quality and adaptability than before.The expansion rate of sealing material is increased from 0.1%of ordinary cement-based sealing material to 10%,which significantly improves the sealing efficiency and gas extraction rate.