Decision making based on high-accuracy specification of geo-structures with use of 3-dimensional survey and inside diagnostic technique

The outcome of this project is the development of the inside inspection technique of the earth-fills, and the 3-dimensional finite element modeling system based on the 3D survey system. By the unified techniques, the high accuracy inspection of the earth-fill structures has become available. The risk assessment method has been proposed based on the inspection. The proposed method has made the decision making for the countermeasures against the natural disaster events possible. The concrete items of the outcome are as follows. (1) Development of the new Swedish Weight Sounding, in which the microphone installed inside to record the sound, and which can move on the slopes; (2) Development of the method of the inspection inside the earth-fills and the grounds based on the sounding, the geophysical survey, and geostatistical simulation; (3) 3D-FEM modeling derived from the 3D geological survey; (4) Model seepage failure tests; (5) Risk assessment of the actual group earth-fill dams.