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Two m e tests are pe orined – investigate the effect of reinforcement stiffness on the load¬≠deformation characteristics of the reinforced walls. The design method which adopts the Rankine’s earth pressure coefficient Ka and a triangular failure wedge is used. Internal instability due to tie-break of the reinforcement was
intentionally introduced by setting the safety factor against tie-break to 1.0. The test results show that both the deformability and the failure pattern are strongly influenced by the stiffness of the reinforcement. A brittle failure with relatively shallow failure surface due to tie-break was observed for the wall with relatively stiff reinforcement. For the wall with extensible reinforcement, load re-distribution in the backfill is significant, and the wall behaves coherently.