超高水材料在注浆封孔技术中的应用

Application of super high water material in grouting and sealing technology

在对土城煤矿13171底抽巷封堵瓦斯抽采钻孔时,通过对比水泥浆液和超高水材料两种封孔材料,在11组钻孔中进行不同水固比超高水材料封堵的实验。在水中添加超高水材料,将水固比定为9∶1,作为最佳的材料配比,同时根据综合钻屑法,将封孔长度定为14m。结果表明,超高水材料用于封堵瓦斯抽采钻孔使流入施工区域的混合浆体在可控时间内胶结、凝聚,达到设计强度,并且注浆时间仅为水泥注浆的50%,注浆成本可降低63%,具有广阔的推广前景。

In the gas drainage drilling of the 13171 bottom pumping road in Tucheng Mine, different water-solid ratio super high water materials were used in 11 groups of boreholes by comparing two kinds of sealing materials, cement slurry and super high water material. Add ultra-high water material in water, the water-solid ratio was set to 9∶1 as the best material ratio, and the sealing length was set to 14 m according to the integrated cuttings method. The results showed that the ultra-high water material was used to block the gas drainage hole, so that the mixed slurry flowing into the construction area can be cemented and agglomerated in a controlled time to reach the design strength, and the grouting time was only 50% of the cement grouting. The cost of grouting could be reduced by 63%, with broad prospects for promotion.