ABSTRACT

Severe deformation and failure frequently occur in roadways with soft or weak surrounding rock and have greatly influenced safe and efficient mining of coal in many coal mines. Using portland cement, emery and fly ash as main raw materials, through laboratory tests, effect of water/binder ratio, cement/sand ratio, water/sodium silicate ratio, water-reducing agent, fly ash/cement ratio, and various performance indexes of grout of fluidity, viscosity, setting time, bleeding rate, compressive strength, concretion rate, and various performance indexes were systematically analyzed. An optimized mixture ratio of the main raw materials added in the grouting material proportion was determined through uniform design method, an optimal mixture ratio was determined by regression analysis. The results show that: 1) The flow performance is significantly affected by change of sodium silicate and water reducer, the compressive strength of grouting material increases significantly with increase in emery content, and decreases significantly with increase in water reducer. 2) An optimized mixture ratio among water-cement ratio, cement-sand ratio, water/sodium silicate ratio, water-reducing agent, fly ash/cement ratio in the grouting material is 0.75, 1.2, 0.08, 0.03, and 0.18, respectively. Field test demonstrated that the material has better performance in reinforcing weak and broken rock mass.

摘要

在围岩软弱的巷道中经常发生严重的变形和破坏，并极大地影响了许多煤矿安全有效地开采煤炭。通过实验室测试，以硅酸盐水泥，金刚砂和粉煤灰为主要原料，水/粘结剂比，水泥/砂比，水/硅酸钠比，减水剂，粉煤灰/水泥比和各种性能指标的影响系统分析了水泥浆的流动性，粘度，凝固时间，渗出率，抗压强度，固结率和各种性能指标。通过均匀设计方法确定了灌浆比例中主要原料的最佳配合比，通过回归分析确定了最佳配合比。结果表明：1）硅酸钠和减水剂的变化显着影响流动性能，灌浆材料的抗压强度随金刚砂含量的增加而显着增加，随减水剂的增加而显着降低。2）灌浆材料中水灰比，水泥沙比，水/硅酸钠比，减水剂，粉煤灰/水泥比之间的最佳混合比分别为0.75、1.2、0.08、0.03和0.18 。现场测试表明，该材料在增强弱碎岩体方面具有更好的性能。灌浆材料中的水泥沙比，水/硅酸钠比，减水剂，粉煤灰/水泥比分别为0.75、1.2、0.08、0.03和0.18。现场测试表明，该材料在增强弱碎岩体方面具有更好的性能。灌浆材料中的水泥沙比，水/硅酸钠比，减水剂，粉煤灰/水泥比分别为0.75、1.2、0.08、0.03和0.18。现场测试表明，该材料在增强弱碎岩体方面具有更好的性能。