Under the combination of heavy loading and high moisture content, the metastable structure of natural loess can easily lead to uneven settlement and damage the overlying infrastructure. Using traditional binder such as cement has harmful impact on the environment, especially due to resource consumption and carbon emission. This research has identified the feasibility of using red mud waste as a partial replacement of cement for loess subgrade treatment in terms of dynamic properties and environmental impact. The performance of loess treated with a combination of waste red mud (RM) and small amount of cement additive (C) is evaluated by considering the complex engineering geological conditions. The results show that dynamic stress (σ_d) and moisture content (w) have a more significant influence on the dynamic properties of RMC-treated loess compared with confining pressure (σ₃) and loading frequency (f). Higher w shows a remarkable reduction in the dynamic load resistance of treated loess, yet the addition of RMC still can improve the microstructure and water sensitivity of loess. Specifically, the failure dynamic stress (σ_df) and the maximum dynamic elastic modulus (E_dmax) of the treated loess at higher w are found to be 100% and 400% higher than those of untreated loess respectively. RMC treatment also improved the dynamic cohesive (c_d) value from 23.2 to 173.6 kPa compared with untreated loess. In addition, the leaching toxicity and radiation of RMC-treated loess indicate that it does not pose any risk to the groundwater. Finally, revised Monismith model has been developed based on the proposed formula for predicting power index b, which can be capable of describing the long-term deformation stability under cyclic loading.

在高负荷和高含水量的共同作用下，天然黄土的亚稳结构很容易导致沉降不均，并破坏上覆的基础设施。使用传统的粘合剂（例如水泥）会对环境造成有害影响，特别是由于资源消耗和碳排放。这项研究从动力特性和环境影响方面确定了使用赤泥废料作为部分替代水泥用于黄土路基处理的可行性。通过考虑复杂的工程地质条件，评估了用废赤泥（RM）和少量水泥添加剂（C）组合处理的黄土的性能。结果表明，动态应力（σ _d）和水分含量（瓦特）有与围压（比较RMC处理的黄土的动态特性更加显著影响σ ₃），而装载次数（˚F）。较高的w表明处理过的黄土的动态载荷阻力显着降低，但是添加RMC仍然可以改善黄土的微观结构和水敏感性。具体而言，故障动态应力（σ _DF）和最大动态弹性模量（Ë _DMAX）在较高的处理过的黄土的瓦特被发现为100％和400％分别比未处理的黄土的高。RMC处理还改善了动态内聚力（c _d值与未处理的黄土相比为23.2至173.6 kPa。此外，经RMC处理的黄土的浸出毒性和辐射表明，它对地下水没有任何危害。最后，基于提出的功率指数b公式，开发了修正的Monismith模型，该模型可以描述循环荷载作用下的长期变形稳定性。