Abstract
A full-scale reinforced subgrade for railways (RSR) was constructed, and repetitive and static load tests were performed to analyze the deformation characteristics of reinforced rigid walls with short reinforcements for railway subgrades that require strict displacement restrictions. Load test results were obtained for four sections, in which the reinforcement arrangement (vertical spacing and length) and wall-reinforcement connection method were applied differently, and the behavior of the reinforced rigid wall was observed according to each parameter. A repetitive load of 500 kPa and a static load of 1000 kPa were applied to the outside of the reinforcement area to evaluate the behavior of the subgrade when utilizing short reinforcement. The test results confirmed the reduction of the settlement and horizontal displacement of the wall, owing to the restraining effect of the short reinforcement and rigid wall. In addition, it was observed that the greater the applied load, the greater the influence of the reinforcement on the behavior of the subgrade; this pattern was more marked in loads above the yield of soil.
Highlights
Since Vidal proposed the concept of reinforced soil, various types of reinforced soil retaining walls have been developed [1]
In the load-strain curves of most reinforcements, a strain pattern showing an inflection point at a load between 500 kPa and 583 kPa was observed. This is similar to the pattern of the settlement and horizontal displacement of the wall described above, and it shows that reinforcement has a greater influence on deformation control after the yield of soil occurs
A full-scale reinforced subgrade for railways (RSR) was designed and constructed, and a load was applied from the outside of the reinforcement area to verify the stiffness increase of the reinforced rigid
Summary
Since Vidal proposed the concept of reinforced soil, various types of reinforced soil retaining walls have been developed [1]. Kim et al investigated the behavior of a reinforced rigid wall for a vertical load applied outside the reinforced area using 2 of 17 model tests [18]; related studies are scarce. Pf : Force of earth pressure of Block F Pb : Force of earth pressure of Block B Rf : Reaction Force acting to Block F Rb : Reaction Force acting to Block B θf : Angle of failure surface of Block F θb : Angle of failure surface of Block B φf : Friction angle between back of wall and Block F φb : Friction angle between Block F and B
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