In the current restoration system, it takes a lot of time to repair due to traffic control, trans-porting fill materials to be restored and the complicated procedure of constructing. These require that the fast emergency restoration technology. However, it happened frequently that re-subsidence (secondary de-formation) of ground restored by poor compacting in sink hole zone. For this reason, the in situ-expanded geosynthetic bags for standard restoration system of ground subsidence was suggested to rapid restoration. Basic studies of the conceptual approach on the application mechanism of in-situ expanded geosynthetic bags and the its key feature of compressive strength (expanding ratio & compressive strength), expansion pressure (act as a compacting pressure), etc. were carried out and discussed to identify the feasibility.
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