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Abstract A series of model tests are carried out on sandy soil slopes with and without reinforcement by soilbags. The reinforcement effect of soilbag is validated by comparing the slope failure modes and ultimate bearing capacities. Based on the test results，an allowable slope failure mode and the velocity field are established. Meanwhile，the ultimate failure heights of the reinforced slopes are obtained by using the upper-bound solution theory，which agrees well with those from the model tests. Both the model tests and the upper-bound calculations show that，after reinforcement with soilbags，the steeper the soil slope is，the more the increases of the ultimate failure height and the bearing capacity of the soil slope are，indicating a better reinforcement effect of soilbags.
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Received: 13 May 2008
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