The thixotropic properties of fresh cemented tailing backfill (CTB) pastes applied in underground backfilling are investigated. Reversibility of thixotropy, equilibrium rheology, and stress decay curves of CTB pastes are discussed. A constitutive model that contains an evolution equation of structural parameter and a constitutive equation for shear stress is proposed. Modifications are made to incorporate the steady-state rheological model and the evolution equation of structural parameter. The proposed model has 8 parameters that are easily determined by fitting experimental data from a series of constant shear rate tests. The good agreement between the predicted and experimental shear stress responses suggests that such a thixotropic model is validated for CTB pastes. Compared to existing thixotropic models, the proposed constitutive model is simple and distinct, showing the novelty of the evolution equation of structural parameter.

研究了用于地下回填的新鲜胶结尾矿回填 (CTB) 膏体的触变性。讨论了 CTB 糊剂的触变性、平衡流变和应力衰减曲线的可逆性。提出了包含结构参数演化方程和剪应力本构方程的本构模型。对稳态流变模型和结构参数的演化方程进行了修改。所提出的模型有 8 个参数，可以通过拟合一系列恒定剪切速率测试的实验数据轻松确定这些参数。预测的和实验的剪切应力响应之间的良好一致性表明，这种触变模型适用于 CTB 糊剂。与现有的触变模型相比，