APPLICATION OF 3D LASER SCANNER IN MAKING DUWEN ROAD TRAVELABLE IN SHORT TERM AFTER WENCHUAN EARTHQUAKE

The Du-Wen highway is a highway of high level standards in Western Sichuan mountainous areas to the Jiu Zaigou National Park. Also, it is the trunk road linking Dujingyan City and Wenchuan county town. The Du-Wen highway follows the Minjing river to the north and its length is 108 km. The road was totally destroyed by a great number of geohazards such as rock collapses and landslides during the Wenchuan Earthquake. The river valleys are very narrow and have high steep slopes with loose and cracked mountainous geomaterials. Considering the importance of the road to the rescue of disasters and reconstruction of the destroyed areas after the earthquake, it must be repaired in a very short period of time. This was a big challenge because there were so many landsides and the rain season was coming. Therefore, 3D-scanning technique was used to help the landform survey and slope stability evaluation. This paper analyzes the applicability and feasibility of the 3D laser scanning survey on this occasion and discusses the approach combined with traditional survey methods. The practices show that it had the characters of high precision, fast operation and high efficient. I It solved many difficult problems during the quickly repairing period 3 months. A general procedure is put forward to apply this technique to quick slope survey and investigation on urgent occasions. 