某铅锌矿破碎带注浆加固之新型无机高强材料性能试验研究

Experimental Study on Properties of A New Inorganic High Strength Material for Grouting Reinforcement of Broken Zone in A Lead-Zinc Mine

随着开采深度的增加,对注浆材料的强度及固结效果提出了更高的要求,针对某铅锌矿破碎带对高强注浆材料的需求,研制一种新型无机高强材料,以增强注浆材料的强度及固结效果有利于提高开采的安全性,解决破碎带问题。以一种水泥基无机注浆加固材料为基础材料,对硅灰、矿粉、偏高岭土及聚丙烯纤维素四种添加剂的掺量开展正交试验,通过对单轴抗压强度、体积膨胀率极差、均值分析比较得出最佳配比。结果表明:硅灰掺量为0.2%、矿粉掺量为0.1%、偏高岭土掺量为12%、聚丙烯纤维素掺量为0.05%时,注浆材料强度、膨胀性最佳并且注浆材料固化体的韧性较好,3、7 d注浆材料的最大单轴抗压强度分别为57.47、63.33 MPa,体积膨胀率分别为2.78%、3.15%。研制的新型无机高强注浆材料的强度高、膨胀性好,且注浆材料固化体的韧性好,具有较高工程推广价值及应用价值。

With the increase of mining depth,higher requirements are put forward for the strength and consolidation effect of grouting materials.According to the demand for high-strength grouting materials in the fracture zone of a lead-zinc mine,a new inorganic high-strength material is developed,to enhance the strength and consolidation effect of grouting material is beneficial to improve the safety of mining and solve the problem of broken zone.Taking a cement-based inorganic grouting reinforcement material as the basic material,the orthogonal test is carried out on the content of silica fume,mineral powder,metakaolin and polypropylene cellulose.The best ratio is obtained through the analysis and comparison of uniaxial compressive strength,extreme difference of volume expansion rate and mean value.The results show that when the content of silica fume is 0.2%,the content of mineral powder is 0.1%,the content of metakaolin is 12%and the content of polypropylene cellulose is 0.05%,the strength and expansibility of the grouting material are the best,and the toughness of the solidified body of the grouting material is good.The maximum uniaxial compressive strength of the grouting material in 3 d and 7 d is 57.47 MPa and 63.33 MPa respectively,and the volume expansion rate is 2.78%and 3.15%respectively.The developed new inorganic high-strength grouting material has high strength,good expansibility and good toughness of the solidified body of the grouting material,and has high engineering popularization value and application value.