## 7 Conclusions  
Considering the context of constructing a 50 m high embankment in Yunnan Province, China, and a thorough investigation into the deformation characteristics of soil-rock mixture fill materials, a comprehensive approach was adopted to manage long-term settlement. In this paper, taking the construction of high-fill embankments with red bed soft rock mixture as the background, the deformation characteristics of mixed-fill materials were revealed first. Then, a dynamic-static coupling method for roadbed filling was proposed, and corresponding control parameters were provided. Finally, the long-term settlement  
Figure 19: The monitoring values on the 48 th day.  
numerical simulations and load-bearing preloading tests were conducted, and the deformation change laws of high embankments with red bed soft rock mixture fill roadbets were revealed. And the main conclusions are as follows:  
1. The cohesion and internal friction angle of the fill material will affect compaction efficiency and the development of long-term settlement; especially for the cohesion values, it will lead to the high-embankment failure.
2. To ensure the quality of high-fill embankments with soil-rock mixture fill, the paving layer thickness should be less than 40 cm, and the rolling times using the coupling dynamic and static compaction method should be more than 6.
3. On-site preloading tests demonstrate that the settlement and deformation of high-fill embankments range from 23 mm to 40 mm. Proper measures, such as super-elevation to accommodate settlement, can balance the post-construction settlement. The monitoring results align closely with the numerical simulation results, confirming that controlled settlement is achieved for the super-high-fill embankment. Long-term observations two years after opening to traffic and driving experiences match the earlier test predictions.  
While significant advancements have been achieved in the construction of a 50 m high embankment in Yunnan Province, China, it is important to acknowledge potential limitations stemming from geological and soil variations. Future research endeavors should aim for broader regional applicability, encompassing additional influencing factors, and incorporate advanced monitoring technologies to enhance this study's practicality and generalizability.  
Conceptualization, Y.Z., B.Z. and X.X.; Methodology, Y.Z., F.C., B.Z. and X.X.; Validation, Y.Z. and F.C.; Investigation, F.C.; Data curation, Y.Z.; Writing--original draft, Y.Z. and F.C.; Writing--review & editing, F.C. and B.Z.; Visualization, F.C.; Supervision, B.Z. and X.X.; Project administration, B.Z. and X.X.; Funding acquisition, B.Z. and X.X. All authors have read and agreed to the published version of the manuscript.  
This work is supported by the National Key Research and Development Program of China (2023 YFC3806701), (2023 YFC3806702), (2023 YFC3806705), the National Natural Science Foundation of China (52038008),(42371082),and the Science and the Key Research and Development Plan of Yunnan Province (2016) 160-[4]), (202103 AA080013).  
**Information Consent Statement:** Not applicable.  
**Data Availability Statement:** Data are contained within the article.  
**Conflicts of Interest:** The authors declare no conflict of interest.