新型注浆材料综合锚注治理大巷底鼓技术

Comprehensive bolt and grouting control technology of mine roadway floor heave with new type grouting material

针对寺河矿二号井15号煤层3条大巷围岩破碎、底鼓量大且持续变形的问题,通过理论分析、钻孔窥视等方法分析了巷道底鼓的原因,得出了其是由重复采动、支护方式不当等多因素综合作用的结果。在治理措施方面重视“时效”理念,要求支护措施快速发挥作用,防止围岩出现非稳态蠕变引发持续性的变形甚至破坏,在本质上改善围岩松散软弱状况,形成良好的传力机制。基于此支护对策,研发了新型CDKS快凝注浆材料,其5~15 min便可固化,8 h便达到理论强度的80%,并且提出了针对两帮、底角及底板的综合锚注治理措施。工程实践表明：对3条大巷锚注施工后,在变形最严重的151101巷40 d平均底鼓量及两帮平均移近量分别为47、56 mm,且均已趋于稳定。对巷道扩帮、拉底后进行综合锚注,能够以较快速度控制围岩变形,证明了该方法的合理性。

According to the surrounding rock broken, high floor heave quantity and sustainable deformation problem occurred in three gateways of No. 15 seam in No. 2 Mine of Sihe Mine ,with the theoretical analysis, in-borehole peep and other methods ,the causes of the floor heave in the gateway were analyzed and the results were the comprehensive effect of the repeated mining, improper support method and other factors. In the aspect of the control measures, the ＂time effect＂ idea was enhanced, the support measures were required to play a rapid role to prevent the sustainable deformation and failure caused by the unstable creep in the surrounding rock, to improve the loose and weaken status of the surrounding rock in essential and to form a good force transfer mechanism. Based on the support countermeasures, thus a new quick setting grouting material CDKS was researched and developed,the solidification would be conducted within 5- 15 min and the theoretical strength could be reached at 80% within 8 hours. The comprehensive bolt and grouting control measures of the two sidewalls, floor corners and floor were provided. The engineering practices showed that after the bolt and grouting construction of the three gateways, in No. 151101 serious deformation gateway, the average floor heave of 40 days and the average convergence between the two sidewalls were 47 mm and 56 mm individually and the gateway was stable in tendency. After the reaming and floor digging of the gateway, the comprehensive bolt and grouting was conducted and could quickly control the deformation of the surrounding rock and the rationality of the method was verified.