稳定铁尾砂碎石混合料设计与性能研究

Design and Performance Study of Stabilized Iron Tailings Gravel Mixture

摘要:

基于密实填充理论，设计了3种不同级配的骨架密实型铁尾砂碎石混合料，通过室内试验揭示了填充度对铁尾砂碎石混合料抗压强度和劈裂强度的影响规律。为进一步了解不同矿铁尾砂碎石混合料稳定后的性能，对马鞍山周边3处矿场铁尾砂碎石混合料进行重型击实试验和强度试验，为铁尾砂碎石混合料的应用提供了主要技术参数。结果表明：填充度小于100%时，填充度与混合料抗压强度和劈裂强度呈正相关关系，在填充度为98%时级配一表现出优异的路用性能；铁尾砂碎石混合料抗压强度能满足不同公路等级的要求，且具有优异的抗冻融性能。

Abstract:

Based on the dense filling theory， three kinds of skeleton dense iron tailings gravel mixtures with different gradations are designed. The influence of filling degree on the compressive strength and splitting strength of iron tailings gravel mixture is revealed through laboratory tests. In order to further understand the performance of different iron tailings gravel mixtures after stabilized， the heavy compaction test and strength test of iron tailings gravel mixture in three mines around Ma'anshan are carried out， which provide the main technical parameters for the application of iron tailings gravel mixture. The results show that when the filling degree is less than 100%， the filling degree is positively correlated with the compressive strength and splitting strength of mixture. When the filling degree is 98%， the gradation 1 shows the excellent pavement performance. The compressive strength of iron tailings gravel mixture can meet the requirements of different highway grades， and has the excellent freeze-thaw resistance.