This paper discusses stability of reinforced soil walls. To investigate the stability, seepage flow tests were conducted. Two types of reinforced soil walls were constructed at the Public Works Research Institute test pit. One was the geogrid wall, and the other was steel strip wall. The both models were constructed with sandy soil and they had a divided facing concrete panel system. Length and spacing of reinforcement materials were determined based on the design manual of Public Work Research Center of Japan. Surcharges were applied to top surface of the reinforced soil walls as simulated surcharged embankment. The surcharges were increased step by step such as, 10, 20, 26, 56, and 112kN/m2. After the end of surcharges, the walls were subjected to seepage flow conditions, it was applied from back of reinforced zone by using water tank prepared in the test pit. In a series of test, facing deformations and strain increments of reinforcement materials were measured.
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