Professor Wu's research effort has made many original contributions to the development and applications of GRS. The following research work has been recognized by many researchers as pioneering research:
- An analytical model for evaluating compaction-induced stresses in a reinforced soil mass.
- An analytical model for determining load carrying capacity of soil-reinforcement composites and the required reinforcement stiffness and strength. The design equations based on the analytical model have been adopted in the newly published FHWA GRS-IBS manual.
- A pre-loading and pre-stressing technique for geosynthetic-reinforced soil retaining walls. The technique has been employed by the Federal Highway Administration in full-scale GRS bridge piers, Tennessee Foothills park GRS bridge abutment, Black Hawk steel arch GRS bridge abutment, and Japan Railway in the construction of bridge abutments for Shinkansen (high-speed bullet train).
- A confined load-deformation testing method of geosynthetics. The testing method has been adopted by FHWA as the test method for geosynthetics under soil confinement.
- Long-term creep characteristics of geosynthetics and GRS mass. I was the author of a “white paper” on the subject for the Transportation Research Board, National Research Council.
- A soil-geosynthetic interactive performance test. It is the only test method capable of simulating soil-geosynthetic interactive behavior in typical operation conditions of GRS structures.
- The CTI design method of GRS walls. It is one of the four most popular design methods used around the world for design of MSE/GRS walls.
- The Denver test walls, two large-scale (10-ft high) fully instrumented GRS walls in plane strain condition, are regarded by many as the best instrumented GRS walls, and have been the object of many doctoral dissertations and research studies.