The wall surface of the geosynthetic reinforced soil wall is preferably as flexible as possi-ble in order to cope with deformation of the foundation ground and backfilled soil during construction, but it is preferable that the rigidity is as large as possible after completion.. In RRR construction method, reinforced soil block would be constructed in advance, and after the deformation of the ground soil and backfill soil of the reinforced soil block was almost finished, wall surface (relatively thin concrete wall) are constructed. This construction method for geosynthetic reinforced soil have been used for roadbed of high-speed railway in Japan. However, problems with the connection between the rigid wall surface and the soft reinforced backfill soil are still being discussed. In this study, a series of laboratory and finite el-ement analysis were performed to solve the above mentioned inconsistency by replacing wall surface to the soil wall reinforced by ground improvement material named N-soil. The greatest advantage of this re-placing method is that the front wall and the backside reinforced soil block are integrated, which elimi-nates the above mentioned inconsistencies and there is no limit to the order of construction. The compo-site reinforced soils showed a horizontal movement of less than 1/2 of the geogrid reinforcement soil at failure load, and exhibited the behavior characteristics within the allowable range similar to that of the block type reinforced soils. The possibility of the role of improved soil surface was confirmed from the above written content.
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