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为了研究混合赤泥胶结特性产生机制,利用XRF、XRD、SEM等微观测试手段分析了混合赤泥在脱水干燥过程中化学成分、矿物组成、微观结构的变化,探讨了胶结强度随脱水龄期延长的变化规律。在此基础上,通过固结排水三轴剪切试验对5个脱水龄期混合赤泥的力学特性进行了研究,揭示了混合赤泥胶结强度的形成对其力学特性和结构性的影响。研究表明:混合赤泥的胶结强度的形成主要是因为烧结法赤泥中的水泥水硬性矿物的水化反应和活性氧化物的碳化反应形成的,并且主要集中在脱水龄期前70 d内;混合赤泥抗剪强度的增长与赤泥胶结强度的形成有直接关系,且主要体现在其黏聚力上;对具有相同初始物理指标、不同脱水龄期的混合赤泥,采用三轴试验各应变水平下不同脱水龄期干燥试样与刚出厂初始试样的主应力差之比所表示的结构性定量化参数,来研究结构性对变形强度的影响可以得到良好的规律性。
In order to study the mechanism of the mixed red mud cementation characteristics, the chemical composition, mineral composition and microstructure of the mixed red mud during dehydration and drying were analyzed by XRF, XRD, SEM and other microscopic tests. The results showed that the cementation strength prolonged with dehydration The law of change. Based on this, the mechanical properties of mixed red mud with five dehydration stages were studied by the consolidated drainage triaxial shear test, and the influence of the formation of the mixed red mud cementation strength on the mechanical properties and structural properties was revealed. The results show that the cementing strength of mixed red mud is mainly due to the hydration reaction of cement hydraulically settable minerals and the carbonation reaction of reactive oxides in the red mud of sintering process, and it mainly concentrates in the first 70 days of dehydration. The growth of the mixed red mud shear strength is directly related to the formation of the red mud cementation strength, which is mainly reflected in its cohesion. For the mixed red mud with the same initial physical indexes and different desiccation age, Strain levels of different dehydration age dry sample and just the initial sample of the main stress difference between the structural quantitative parameters, to study the structure of the deformation strength can get a good regularity.