A Dynamic Centrifuge Model Test for the Seismic Strengthening of Existing Embankments by the Reinforcement Bar Inserting Method

摘要

Seismic strengthening of existing embankments for Level II Earthquake Motion has been posed as an issue since the Great Hanshin Earthquake. It is considered as necessary to perform seismic strengthening according to the importance of the embankments. The aim of this report is to inspect economical seismic strengthening measures for existing road embankments. We inspected whether we could achieve mitigation of deformation in Level II Earthquake Motion by casting reinforcing bars, which are effective for general purposes in the existing embankments. We inspected this with a dynamic centrifuge model experiment. We placed the reinforcing bars in certain intervals on the slope side and under the roadbed,and also set bearing pressure plates at the head of the placed reinforcing bars. As a result, the sinking of the embankment was mitigated for Level II Earthquake Motion. Also, it was confirmed that the cracks on the top of the embankment were reduced.