Abstract
The Kumamoto earthquake Mj7.3（Mw7.0） occurred on April 16, 2016, centered in the Kumamoto area, and largescale of slope collapse broke out in the Aso Ohashi bridge area. In this slope collapse site, damages to any roads and railways were intense, furthermore, there was concern that a further slope collapse could occur by repeated aftershock. Therefore, it was required that the investigation and construction were carried out swiftly while ensuring safety. At this time, in the area of a collapsed slope where people could not enter, aerial laser measurements to contribute to the survey design along with photogrammetry and measurements by an UAV in accordance with the progress of construction have been conducted, as well as further surface exploration utilizing the above results, bedrock stability evaluations and so on have been realized. Also, the design of the size and the shape for the land retaining embankment, and also the excavation range for the earth removal work of the top of slope on the basis of the three-dimensional data that was made based on survey results and geological reconnaissance. These prevention works carried out safely by unmanned machinery, while monitoring the slopes by the field observation under the construction. These series of investigation, design and construction were conducted with using the ICT（Information and Communication Technology）.
