Background With the increase of national investment in infrastructure, many slopes have been generated in the construction process of transportation, water conservancy and other projects. The excavation of the slope destroys the structural plane and plant cover of the slope, resulting in frequent problems such as soil erosion and shallow landslides. And with the concept of ecological civilization deeply rooted in the hearts of the people, people have begun to seek new technologies that can not only ensure the safety of slopes, but also take into account the ecology. This work aims to comprehensively improve the stability of slope anti-slip and anti-erosion and the ecological effect of slope treatment.

Methods This study prepared novel fluidized solidified soil using nitrate-based cement activator combined with cement as the curing agent and local loam as the base material. Different mix ratios were systematically evaluated through laboratory tests, including direct shear tests (measuring cohesion and internal friction angle), simulated rainfall scouring tests (assessing erosion resistance), and vegetation growth trials (analyzing seedling emergence rates). Based on experimental results and engineering requirements, optimal mix proportions were determined. Subsequently, a layered spraying technique was applied to a soil slope in Xiling, Yixian county for field implementation. Post-construction, long-term monitoring of treatment effectiveness was conducted to evaluate slope stability and ecological restoration performance.

Results 1) The cohesion and internal friction angle of the fluidized stabilized soil increase along with the augmentation of the hardener dosage and age, while the erosion amount decreases. 2) When the hardener dosage is elevated from two percent to four percent, the outgrowth rate declines by more than 48.89%. The cement content is at the level of two percent, the outgrowth rate remains approximately 20 percent. 3) Under the condition that the content of curing agent is less than or equal to two percent, plant growth can significantly improve the impact resistance of solidified soil, and the erosion amount reduces by 22.7 % to 60.9 %. 4) After the engineering treatment, the planting effect on the slope is excellent, and the slope remains stable after the "23.7" heavy rainstorm. Although the planting is affected to a certain extent, the natural recovery effect is satisfactory in the following year.

Conclusions This study demonstrates that the novel fluidized solidified soil technology effectively addresses the dual challenges of slope stabilization and ecological preservation raised in the background. By integrating mechanical reinforcement with vegetation compatibility, it achieves enhanced erosion resistance while maintaining acceptable plant germination rates (20% at 2% cement content). The success of layered spraying in extreme rainfall conditions validates its potential as a sustainable solution for eco-sensitive slope engineering, aligning with ecological civilization goals. Future efforts should focus on balancing strength-vegetation trade-offs to optimize long-term performance.